U.S. patent application number 11/786409 was filed with the patent office on 2008-08-21 for complementing cell lines.
This patent application is currently assigned to Crucell Holland B.V.. Invention is credited to Menzo Jans Emco Havenga, Majid Mehtali, Ronald Vogels.
Application Number | 20080199433 11/786409 |
Document ID | / |
Family ID | 24867049 |
Filed Date | 2008-08-21 |
United States Patent
Application |
20080199433 |
Kind Code |
A1 |
Vogels; Ronald ; et
al. |
August 21, 2008 |
Complementing cell lines
Abstract
A packaging cell line that complements recombinant adenoviruses
based on serotypes from subgroup B, preferably adenovirus type 35.
The cell line is preferably derived from primary, diploid human
cells that are transformed by adenovirus E1 sequences either
operatively linked on one DNA molecule or located on two separate
DNA molecules, the sequences being operatively linked to regulatory
sequences enabling transcription and translation of encoded
proteins. Also disclosed is a cell line derived from PER.C6 that
expresses functional Ad35 E1B sequences. The Ad35-E1B sequences are
driven by the E1B promoter or a heterologous promoter and
terminated by a heterologous poly-adenylation signal. The cell
lines are useful for producing recombinant adenoviruses designed
for gene therapy and vaccination. The cell lines can also be used
for producing human recombinant therapeutic proteins such as human
growth factors and human antibodies. Also, the cell lines are
useful for producing human viruses other than adenovirus such as
influenza virus, herpes simplex virus, rotavirus, and measles
virus.
Inventors: |
Vogels; Ronald; (Linschoten,
NL) ; Havenga; Menzo Jans Emco; (Alphen a/d Rijn,
NL) ; Mehtali; Majid; (Plobsheim, FR) |
Correspondence
Address: |
TRASK BRITT
P.O. BOX 2550
SALT LAKE CITY
UT
84110
US
|
Assignee: |
Crucell Holland B.V.
Leiden
NL
|
Family ID: |
24867049 |
Appl. No.: |
11/786409 |
Filed: |
April 11, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11165697 |
Jun 24, 2005 |
7344883 |
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11786409 |
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10002750 |
Nov 15, 2001 |
6974695 |
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11165697 |
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09713678 |
Nov 15, 2000 |
6492169 |
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10002750 |
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Current U.S.
Class: |
424/93.2 ;
435/235.1; 435/236 |
Current CPC
Class: |
C12N 2710/10343
20130101; C12N 2710/10051 20130101; C12N 2830/00 20130101; C12N
7/025 20130101; A61P 43/00 20180101; C12N 7/00 20130101; C12N
2710/10352 20130101; C12N 2710/10041 20130101; C12N 15/86 20130101;
C12N 15/861 20130101; C12N 2840/20 20130101 |
Class at
Publication: |
424/93.2 ;
435/235.1; 435/236 |
International
Class: |
A61K 48/00 20060101
A61K048/00; A61P 43/00 20060101 A61P043/00; C12N 7/00 20060101
C12N007/00; C12N 7/04 20060101 C12N007/04 |
Claims
1.-37. (canceled)
38. An adenoviral packaging cell line permissive for replication of
an E1A/E1B deficient adenovirus vector, wherein said adenoviral
packaging cell line comprises an adenovirus E1A coding sequence and
an adenovirus E1B coding sequence each operably linked to a
promoter that lacks substantial sequence identity with a native
adenovirus E1A or E1B promoter, and wherein said adenovirus E1A
coding sequence and said adenovirus E1B coding sequence are stably
integrated into said adenoviral packaging cell line and are
operably linked to identical promoters.
39. The adenoviral packaging cell line of claim 38, wherein said
adenovirus E1A coding sequence and said adenovirus E1B coding
sequence are stably integrated at different sites in said
adenoviral packaging cell line.
40. The adenoviral packaging cell of claim 38, wherein said
promoter that lacks substantial sequence identity with a native
adenovirus E1A or E1B promoter is a retrovirus promoter.
41. The adenoviral packaging cell of claim 38, wherein said
adenovirus E1A coding sequence comprises the E1A coding sequence of
GenBank Accession Number M73260.
42. The adenoviral packaging cell of claim 38, wherein said
adenovirus E1B coding sequence comprises the E1B coding sequence of
GenBank Accession Number M73260.
43. The adenoviral packaging cell line of claim 39, wherein said
packaging cell line is of human origin.
44. The adenoviral packaging cell line of claim 43, wherein said
adenoviral packaging cell line originates from a cell line selected
from the group consisting of A549 cells permissive for adenovirus
replication, PC-3 cells, and primary cells permissive for
adenovirus production.
45. An adenoviral packaging cell line comprising a first expression
vector and a second expression vector stably integrated into the
genome of said packaging cell line, wherein said first expression
vector comprises adenovirus E1A coding sequences, operably linked
to a non-adenoviral heterologous promoter, and said second
expression vector comprises adenovirus E1B coding sequences
operably linked to a non-adenoviral heterologous promoter.
46. A method of producing an adenovirus packaging cell line
permissive for replication of an E1A/E1B deficient adenovirus
vector, the method comprising: introducing into a cell line
permissive for adenovirus replication, nucleic acid comprising (i)
an adenovirus E1A coding sequence operably linked to a promoter
that lacks substantial sequence identity with a native adenovirus
E1A or E1B promoter and (ii) an adenovirus E1B coding sequence
operably linked to a promoter that lacks substantial sequence
identity with a native adenovirus E1A or E1B promoter, and wherein
the nucleic acid comprising the adenovirus E1A coding sequence and
the nucleic acid comprising the adenovirus E1B coding sequence are
present on separate vectors.
47. The method according to claim 46, wherein one of the separate
vectors comprises a retroviral nucleotide sequence.
48. The method according to claim 46, wherein each of the separate
vectors comprises a retroviral nucleotide sequence.
49. An adenoviral packaging cell line permissive for replication of
an E1A/E1B deficient adenovirus vector, wherein said adenoviral
packaging cell line comprises an adenovirus E1A coding sequence,
each and an adenovirus E1B coding sequence operably linked to a
promoter that lacks substantial sequence identity to a native
adenovirus E1A or E1B promoter, and wherein said adenovirus EA
coding sequence and said adenovirus E1B coding sequence are stably
integrated into the adenoviral packaging cell line and are operable
linked to different heterologous promoters.
50. The adenoviral packaging cell line of claim 49, wherein said
adenovirus E1A coding sequence and said adenovirus E1B sequence are
stable integrated at different sites in said adenoviral packaging
cell line.
51. The adenoviral packaging cell line of claim 49, wherein said
heterologous promoters that lacks substantial sequence identity to
a native adenovirus E1A or E1B promoter are retrovirus
promoters.
52. The adenoviral packaging cell of claim 49, wherein said
adenovirus EA coding sequence comprises the E1A coding sequence of
GenBank Accession Number M73260.
53. The adenoviral packaging cell of claim 49, wherein said
adenovirus E1B coding sequence comprises the E1B coding sequence of
GenBank Accession Number M73260.
54. The adenoviral packaging cell line of claim 50, wherein said
adenoviral packaging cell line is of human origin.
55. The adenoviral packaging cell line of claim 50, wherein said
adenoviral packaging cell line originates from a cell line selected
from the group consisting of A549 cells permissive for adenovirus
replication, PC-3 cells, and primary cells permissive for
adenovirus production.
56. A method of producing an adenoviral packaging cell line
permissive for replication of an E1A/E1B deficient adenovirus
vector, the method comprising: introducing into a cell line
permissive for adenovirus replication, nucleic acid comprising (i)
an adenovirus E1A coding sequence operably linked to a promoter
that lacks substantial sequence identity with a native adenovirus
E1A or E1B promoter and (ii) an adenovirus E1B coding sequence
operably linked to a promoter that lacks substantial sequence
identity with a native adenovirus E1A or E1B promoter, wherein the
nucleic acid comprising the adenovirus E1A coding sequence and the
nucleic acid comprising the adenovirus E1B coding sequence are
present on separate vectors and the promoters operably linked to
the E1A and E1B coding sequences are different.
57. The method according to claim 56, wherein one of the separate
vectors comprises a retroviral nucleotide sequence.
58. The method according to claim 56, wherein each of the separate
vectors comprises a retroviral nucleotide sequence.
59. An adenoviral vector substantially free of replication
competent adenovirus, produced by a packaging cell line permissive
for replication of an E1A/E1B deficient adenoviral vector, wherein
said packaging cell line comprises an adenoviral E1A coding
sequence and an adenoviral E1B coding sequence operably linked to a
promoter that lacks substantial sequence identity with a native
adenoviral E1A or E1B promoter, and wherein said adenoviral E1A
coding sequence and said adenoviral E1B coding sequence are stably
integrated into said packaging cell line and are operably linked to
different heterologous promoters.
60. The adenoviral vector of claim 59, wherein said adenoviral E1A
coding sequence and said adenoviral E1B sequence are stable
integrated at different sites in said packaging cell line.
61. The adenoviral vector of claim 59, wherein said packaging cell
line is of human origin.
62. The adenoviral vector of claim 61, wherein said adenoviral
packaging cell line originates from a cell line selected from the
group consisting of A549 cells permissive for adenovirus
replication, PC-3 cells, and primary cells permissive for
adenovirus production.
63. The adenoviral vector of claim 59, wherein the promoter in said
adenoviral packaging cell line that lacks substantial sequence
identity with a native adenoviral E1A or E1B promoter is a
retrovirus promoter.
64. The adenoviral vector of claim 59, wherein said adenoviral E1A
coding sequence in said packaging cell line comprises the E1A
coding sequence of GenBank Accession Number M73260.
65. The adenoviral vector of claim 59, wherein said adenoviral E1B
coding sequence in said packaging cell line comprises the E1B
coding sequence of GenBank Accession Number M73260.
66. The adenoviral vector according to claim 59, wherein said
packaging cell line comprises a first expression vector and a
second expression vector stably integrated into said packaging cell
line's genome, wherein said first expression vector comprises
adenoviral E1A coding sequences, operably linked to a
non-adenoviral heterologous promoter, and said second expression
vector comprises adenoviral E1B coding sequences operably linked to
a non-adenoviral heterologous promoter.
67. The adenoviral vector according to claim 66, wherein said first
expression vector comprises a retroviral nucleotide sequence.
68. The adenoviral vector according to claim 66, wherein said first
and second expression vectors each comprise a retroviral nucleotide
sequence.
69. The adenoviral vector according to claim 59, wherein said
adenoviral vector is replication defective.
70. A composition comprising the adenoviral vector of claim 59,
together with a pharmaceutically acceptable excipient.
71. An adenoviral vector substantially free of replication
competent adenovirus, produced by a packaging cell line permissive
for replication of an E1A/E1B deficient adenoviral vector, wherein
said packaging cell line comprises an adenoviral E1A coding
sequence and an adenoviral E1B coding sequence operably linked to a
promoter that lacks substantial sequence identity with a native
adenoviral E1A or E1B promoter, and wherein said adenoviral E1A
coding sequence and said adenoviral E1B coding sequence are stably
integrated into said packaging cell line and are operably linked to
identical promoters.
72. The adenoviral vector of claim 71, wherein said adenoviral E1A
coding sequence and said adenoviral E1B sequence are stable
integrated at different sites in said packaging cell line.
73. The adenoviral vector of claim 71, wherein said packaging cell
line is of human origin.
74. The adenoviral vector of claim 73, wherein said packaging cell
line originates from a cell line selected from the group consisting
of A549 cells permissive for adenovirus replication, PC-3 cells,
and primary cells permissive for adenovirus production.
75. The adenoviral vector of claim 71, wherein the promoter in said
packaging cell line that lacks substantial sequence identity with a
native adenoviral E1A or E1B promoter is a retrovirus promoter.
76. The adenoviral vector of claim 71, wherein said adenoviral E1A
coding sequence in said packaging cell line comprises the E1A
coding sequence of GenBank Accession Number M73260.
77. The adenoviral vector of claim 71, wherein said adenoviral E1B
coding sequence in said packaging cell line comprises the E1B
coding sequence of GenBank Accession Number M73260.
78. The adenoviral vector according to claim 71, wherein said
adenoviral vector is replication defective.
79. A composition comprising the adenoviral vector of claim 71,
together with a pharmaceutically acceptable excipient.
80. A cell comprising an adenovirus E1A coding sequence and an
adenovirus E1B coding sequence each operably linked to a promoter
that lacks substantial sequence identity with a native adenovirus
E1A or E1B promoter, and wherein said adenovirus E1A coding
sequence and said adenovirus E1B coding sequence are stably
integrated into said packaging cell line and are operably linked to
identical promoters.
81. A method of producing a modified cell line, the method
comprising: introducing into a first cell line permissive for
adenovirus replication, nucleic acid comprising (i) an adenovirus
E1A coding sequence operably linked to a promoter that lacks
substantial sequence identity with a native adenovirus E1A or E1B
promoter and (ii) an adenovirus E1B coding sequence operably linked
to a promoter that lacks substantial sequence identity with a
native adenovirus E1A or E1B promoter, and wherein the nucleic acid
comprising the adenovirus E1A coding sequence and the nucleic acid
comprising the adenovirus E1B coding sequence are present on
separate vectors.
82. A cell line comprising an adenovirus E1A coding sequence, each
and an adenovirus E1B coding sequence operably linked to a promoter
that lacks substantial sequence identity to a native adenovirus E1A
or E1B promoter, and wherein said adenovirus E1A coding sequence
and said adenovirus E1B coding sequence are stably integrated into
the cell line and are operable linked to different heterologous
promoters.
83. A method of producing a modified cell line, the method
comprising: introducing into a first cell line permissive for
adenovirus replication, nucleic acid comprising (i) an adenovirus
E1A coding sequence operably linked to a promoter that lacks
substantial sequence identity with a native adenovirus E1A or E1B
promoter and (ii) an adenovirus E1B coding sequence operably linked
to a promoter that lacks substantial sequence identity with a
native adenovirus E1A or E1B promoter, wherein the nucleic acid
comprising the adenovirus E1A coding sequence and the nucleic acid
comprising the adenovirus E1B coding sequence are present on
separate vectors and the promoters operably linked to the E1A and
E1B coding sequences are different.
84. A system comprising an adenoviral vector substantially free of
wild-type replication competent adenovirus, and a packaging cell
line permissive for replication of an E1A/E1B deficient adenoviral
vector, wherein said packaging cell line comprises an adenoviral
E1A coding sequence and an adenoviral E1B coding sequence operably
linked to a promoter that lacks substantial sequence identity with
a native adenoviral E1A or E1B promoter, and wherein said
adenoviral E1A coding sequence and said adenoviral E1B coding
sequence are stably integrated into said packaging cell line and
are operably linked to different heterologous promoters.
85. The system of claim 84, wherein said adenoviral E1A coding
sequence and said adenoviral E1B sequence are stable integrated at
different sites in said packaging cell line.
86. The system of claim 84, wherein said packaging cell line is of
human origin.
87. The system of claim 86, wherein said packaging cell line
originates from a cell line selected from the group consisting of
A549 cells permissive for adenovirus replication, PC-3 cells, and
primary cells permissive for adenovirus production.
88. The system of claim 84, wherein the promoter in said packaging
cell line that lacks substantial sequence identity with a native
adenoviral E1A or E1B promoter is a retrovirus promoter.
89. The system of claim 84, wherein said adenoviral E1A coding
sequence in said packaging cell line comprises the E1A coding
sequence of GenBank Accession Number M73260.
90. The system of claim 84, wherein said adenoviral E1B coding
sequence in said packaging cell line comprises the E1B coding
sequence of GenBank Accession Number M73260.
91. The system according to claim 84, wherein said packaging cell
line comprises a first expression vector and a second expression
vector stably integrated into said packaging cell line's genome,
wherein said first expression vector comprises adenoviral E1A
coding sequences, operably linked to a non-adenoviral heterologous
promoter, and said second expression vector comprises adenoviral
E1B coding sequences operably linked to a non-adenoviral
heterologous promoter.
92. The system according to claim 91, wherein said first expression
vector comprises a retroviral nucleotide sequence.
93. The system according to claim 91, wherein said first and second
expression vectors each comprise a retroviral nucleotide
sequence.
94. The system according to claim 84, wherein said adenoviral
vector is replication defective.
95. The system according to claim 84, wherein no wild type
replication competent adenovirus is detected following 18 cycles of
infection.
96. A system comprising an adenoviral vector substantially free of
wild type replication competent adenovirus, and a packaging cell
line permissive for replication of an E1A/E1B deficient adenoviral
vector, wherein said packaging cell line comprises an adenoviral
E1A coding sequence and an adenoviral E1B coding sequence operably
linked to a promoter that lacks substantial sequence identity with
a native adenoviral E1A or E1B promoter, and wherein said
adenoviral E1A coding sequence and said adenoviral E1B coding
sequence are stably integrated into said packaging cell line and
are operably linked to identical promoters.
97. The system of claim 96, wherein said adenoviral E1A coding
sequence and said adenoviral E1B sequence are stable integrated at
different sites in said packaging cell line.
98. The system of claim 96, wherein said packaging cell line is of
human origin.
99. The system of claim 98, wherein said packaging cell line
originates from a cell line selected from the group consisting of
A549 cells permissive for adenovirus replication, PC-3 cells, and
primary cells permissive for adenovirus production.
100. The system of claim 96, wherein the promoter in said packaging
cell line that lacks substantial sequence identity with a native
adenoviral E1A or E1B promoter is a retrovirus promoter.
101. The system of claim 96, wherein said adenoviral E1A coding
sequence in said packaging cell line comprises the E1A coding
sequence of GenBank Accession Number M73260.
102. The system of claim 96, wherein said adenoviral E1B coding
sequence in said packaging cell line comprises the E1B coding
sequence of GenBank Accession Number M73260.
103. The system according to claim 96, wherein said adenoviral
vector is replication defective.
104. The system according to claim 96, wherein no wild type
replication competent adenovirus is detected following 18 cycles of
infection.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 11/165,697, filed Jun. 24, 2005, which is a
continuation of U.S. patent application Ser. No. 10/002,750, filed
Nov. 15, 2001, now U.S. Pat. No. 6,974,695, issued Dec. 13, 2005,
which is a continuation-in-part of application Ser. No. 09/713,678,
filed Nov. 15, 2000, now U.S. Pat. No. 6,492,169, issued Dec. 10,
2002, the contents of each of which are hereby incorporated herein
by this reference.
TECHNICAL FIELD
[0002] The invention relates to the field of biotechnology
generally and, more specifically, to adenoviral-based complementing
cell lines.
SEQUENCE LISTING
[0003] Pursuant to 37 C.F.R. 1.821(e), applicants request that the
compliant computer readable form Sequence Listing already submitted
in the incorporated patent application U.S. Ser. No. 10/002,750,
filed Nov. 15, 2001 be used for this patent application. The paper
copy of the "Sequence Listing" in this application is identical to
the computer readable copy filed for the patent application U.S.
Ser. No. 10/002,750, filed Nov. 15, 2001.
BACKGROUND
[0004] Typically, vector and packaging cells have to be adapted to
one another so that they have all the necessary elements, but they
do not have overlapping elements that lead to replication-competent
virus by recombination. Therefore, the sequences necessary for
proper transcription of the packaging construct may be heterologous
regulatory sequences derived from, for example, other human
adenovirus (Ad) serotypes, nonhuman adenoviruses, other viruses
like, but not limited to, SV40, hepatitis B virus (HBV), Rous
Sarcoma Virus (RSV), cytomegalovirus (CMV), etc., or from higher
eukaryotes such as mammals. In general, these sequences include a
promoter, enhancer and poly-adenylation sequences.
[0005] PER.C6 is an example of a cell line devoid of sequence
overlap between the packaging construct and the adenoviral vector
(Fallaux et al., 1998). The PER.C6 cell line was deposited under
ECACC deposit number 96022940 under the provisions of the Budapest
Treaty with the Centre for Applied Microbiology and Research
Authority (European Collection of Animal Cell Cultures), Porton
Down, Salisbury, Wiltshire SP4, OJG, United Kingdom, an
International Depository Authority, on Feb. 29, 1996. Recombinant
viruses based on subgroup C adenoviruses, such as Ad5 and Ad2, can
be propagated efficiently on these packaging cells. Generation and
propagation of adenoviruses from other serotypes, like subgroup B
viruses, has proven to be more difficult on PER.C6 cells. However,
as described in EP Appln. 00201738.2, recombinant viruses based on
subgroup B virus Ad35 can be made by co-transfection of an
expression construct containing the Ad35 early region-1 sequences
(Ad35-E1). Furthermore, Ad35-based viruses that are deleted for E1A
sequences were shown to replicate efficiently on PER.C6 cells.
Thus, the E1A proteins of Ad5 complement Ad35-E1A functions,
whereas, at least part of the E1B functions of Ad35 are necessary.
This serotype specificity in E1B functions was recently also
described for Ad7 recombinant viruses. In an attempt to generate
recombinant adenoviruses derived from subgroup B virus Ad7,
Abrahamsen et al. (1997) were not able to generate E1-deleted
viruses on 293 cells without contamination of wild-type (wt) Ad7.
Viruses that were picked after plaque purification on 293-ORF6
cells (Brough et al., 1996) were shown to have incorporated Ad7-E1B
sequences by nonhomologous recombination. Thus, efficient
propagation of Ad7 recombinant viruses proved possible only in the
presence of Ad7-E1B expression and Ad5-E4-ORF6 expression. The E1B
proteins are known to interact with cellular, as well as viral,
proteins (Bridge et al., 1993; White, 1995). Possibly, the complex
formed between the E1B-55K protein and E4-ORF6 which is necessary
to increase mRNA export of viral proteins and to inhibit export of
most cellular mRNAs, is critical and in some way
serotype-specific.
DISCLOSURE OF THE INVENTION
[0006] The invention provides new packaging cell lines capable of
complementing recombinant adenoviruses based on serotypes other
than subgroup C viruses, such as serotypes from subgroup B like
adenovirus type 35.
[0007] In one aspect, the invention provides packaging cell lines
capable of complementing recombinant adenovirus based on a serotype
of subgroup B, preferably of serotype 35. With the terms "based on
or derived from an adenovirus" is meant that it utilizes nucleic
acid corresponding to nucleic acid found in the serotype. The
utilized nucleic acid may be derived by PCR cloning or other
methods known in the art.
[0008] In one aspect, the new packaging cells are derived from
primary, diploid human cells such as, but not limited to, primary
human retinoblasts, primary human embryonic kidney cells or primary
human amniocytes. Transfection of primary cells or derivatives
thereof with the adenovirus E1A gene alone can induce unlimited
proliferation (immortalization), but does not result in complete
transformation. However, expression of E1A in most cases results in
induction of programmed cell death (apoptosis), and occasionally
immortalization is obtained (Jochemsen et al., 1987). Co-expression
of the E1B gene is required to prevent induction of apoptosis and
for complete morphological transformation to occur (reviewed in
White, 1995). Therefore, in one aspect of the invention, primary
human cells or derivatives thereof are transformed by expression of
adenovirus E1 proteins of a subgroup other than subgroup C,
preferably subgroup B, more preferably adenovirus type 35. The
combined activity of the E1A and E1B proteins establishes
indefinite growth of the cells and enables complementation of
recombinant adenoviruses.
[0009] The complete morphological transformation of primary cells
by adenovirus E1 genes is the result of the combined activities of
the proteins encoded by the E1A and E1B regions. The roles of the
different E1 proteins in lytic infection and in transformation have
been studied extensively (reviewed in Zantema and van der Eb, 1995;
White, 1995, 1996). The adenovirus E1A proteins are essential for
transformation of primary cells. The E1A proteins exert this effect
through direct interaction with a number of cellular proteins that
are involved in regulation of transcription. These include the pRB
family of proteins, p300/CBP and TATA binding protein. In addition
to this E1A increases the level of p53 protein in the cells. In the
absence of adenovirus E1B activity the rise in p53 levels leads to
the induction of apoptosis. Both proteins encoded by the E1B region
counteract the induction of apoptosis although by different
mechanisms. E1B-21K seems to counteract apoptosis in a manner
similar to Bcl-2 via interaction with the effector proteins
downstream in the apoptosis pathway (Han et al., 1996), whereas
E1B-55K functions through direct interaction with p53. Importantly,
the molecular mechanism by which the E1B-55K proteins of Ad2 and 5
(subgroup C) and Ad12 (subgroup A) function in the ability to
neutralize p53 may differ. Whereas Ad5 E1B-55K binds p53 strongly
and the complex localizes to the cytoplasm, Ad12 E1B-55K binds p53
weakly and both proteins are localized in the nucleus (Zantema et
al., 1985; Grand et al., 1999). Both proteins, however, inhibit the
transactivation of other genes by p53 (Yew and Berk, 1992).
[0010] In rodent cells, the activity of E1A together with either
E1B-21K or 55K is sufficient for full transformation although
expression of both E1B proteins together is twice as efficient (Rao
et al., 1992). In human cells however, the activity of the E1B-55K
protein seems to be more important given the observation that
E1B-55K is indispensable for the establishment of transformed cells
(Gallimore, 1986).
[0011] Example 6 hereof describes the generation of pIG270. In this
construct, the Ad35-E1 genes are expressed from the hPGK promoter
and transcription is terminated by the HBVpA. The hPGK promoter
constitutes a HincII-EcoRI fragment of the promoter sequence
described by Singer-Sam et al. (1984). The HBVpA is located in a
BamHI-BglII fragment of the Hepatitis B virus genome (Simonsen and
Levinson, 1983; see also Genbank HBV-AF090841). As mentioned
before, the promoter and polyadenylation sequences of the E1
expression constructs described in this invention may be derived
from other sources without departing from the invention. Also,
other functional fragments of the hPGK and HBVpA sequences
mentioned herein may be used.
[0012] The functionality of pIG270 was shown by transformation of
primary Baby Rat Kidney cells (BRK). Comparison with an equivalent
Ad5-E1 expression construct taught that Ad35-E1 genes were less
efficient in transforming these cells. The same has been found for
the E1 genes of Ad12 (Bernards et al., 1982).
[0013] It is unclear which E1 protein(s) determine(s) the
difference in transformation efficiency of E1 sequences observed
for adenoviruses from different subgroups. In the case of Ad12,
transfection studies with chimeric E1A/E1B genes suggested that the
efficiency of transformation of BRK cells was determined by the E1A
proteins (Bernards et al., 1982). The E1B-55K protein is shown
infra to contain serotype-specific functions necessary for
complementation of E1-deleted adenoviruses. If these functions are
related to the regulation of mRNA distribution or another late
viral function, it is unlikely that these are involved in the
transformation efficiency.
[0014] Analysis of functional domains in the Ad2 or Ad5 E1B-55K
proteins using insertion mutants have revealed that functions
related to viral replication, late protein synthesis and host
protein shut-off are not confined to specific domains but are
distributed along the protein (Yew et al., 1990). Using the same
set of mutants, the domains important for interaction with p53 and
E4-Orf6 were found to be more restricted. In addition to one common
binding region (amino acids 262 to 326), p53 binding was affected
by mutations at aa 180 and E4-Orf6 binding was affected by
mutations at aa 143 (Yew and Berk, 1992; Rubenwolf et al.,
1997).
[0015] Altogether these results indicate that it is difficult to
separate the E1B-55K functions related to transformation (p53
binding) and late protein synthesis (Orf6 binding).
[0016] The invention discloses new E1 constructs that combine the
high efficiency of transformation of one serotype with the
serotype-specific complementation function of another serotype.
These new constructs are used to transform primary human embryonic
retinoblast cells and human amniocytes.
[0017] In another aspect of the invention, the transforming E1
sequences are derived from different serotypes. As disclosed in
European Patent application 00201738.2, Ad35E1 sequences are
capable of transforming Baby Rat Kidney (BRK) cells, albeit with a
lower efficiency than that seen with Ad5-E1 sequences. This was
also observed for E1 sequences from Ad12 (Bernards et al., 1982).
Therefore, in this aspect of the invention, primary diploid human
cells or derivatives thereof are transformed with chimeric E1
construct that consists of part of the E1 sequences of a serotype
that enables efficient transformation of primary human cells or
derivatives thereof and part of the E1 sequences of another
serotype which E1 sequences provide the serotype-specific E1B
function(s) that enable(s) efficient propagation of E1-deleted
viruses of that serotype. In a preferred embodiment of this aspect
of the invention, the E1A region is derived from a subgroup C
adenovirus like, but not limited to, Ad5, and the E1B coding
sequences are derived from an alternative adenovirus, more
particularly from an adenovirus of subgroup B, even more
particularly from adenovirus type 35. E1B-21K coding sequences may
also be chimeric comprising both subgroup C and subgroup B coding
sequences. Preferably, all or most of E1B-21K comprises subgroup C
coding sequences. In a more preferred embodiment, the E1A coding
sequences and the E1B-21K coding sequences are derived from a
subgroup C adenovirus, like, but not limited to, Ad5. In one
embodiment the cell further comprises E1B-55k coding sequences that
are, preferably, as far as not overlapping with the 21K coding
sequences derived from an adenovirus of subgroup B, more
particularly from adenovirus type 35. In an even more preferred
embodiment, all E1 coding sequences are derived from a subgroup C
adenovirus, like but not limited to Ad5, except for at least the
part of the E1B-55K coding sequences that are necessary for
serotype-specific complementation of an alternative adenovirus
subgroup, more particularly adenovirus subgroup B, even more
particular adenovirus type 35. The invention also provides a
packaging cell line wherein the primary, diploid human cells or
derivatives thereof have been transformed with a chimeric
adenovirus E1 construct comprising part of a first adenovirus E1
coding sequence of a first adenovirus serotype that enables
efficient transformation of primary human cells and derivatives
thereof; and part of a second adenovirus E1 coding sequence of a
second adenovirus serotype, wherein the second adenovirus E1 coding
sequence provides the serotype-specific adenovirus E1B function(s)
that enable(s) efficient propagation of recombinant adenovirus
E1-deleted viruses of the second adenovirus serotype. Preferably,
the first adenovirus serotype is a subgroup C adenovirus and the
second adenovirus serotype is a subgroup B adenovirus, more
particular adenovirus type 35. In one embodiment the packing cell
line of the invention comprises bovine adenovirus E1B-55k. Such a
bovine E1B-55k expressing cell line is particularly suited for
obtaining high yields of a complemented bovine recombinant
adenovirus.
[0018] The primary diploid human cells or derivatives thereof are
transformed by adenovirus E1 sequences, either operatively linked
on one DNA molecule or located on two separate DNA molecules. In
the latter case, one DNA molecule carries at least part of the E1
sequences of the serotype-enabling efficient transformation and the
second DNA molecule carries at least part of the sequences
necessary for serotype-specific complementation. Also provided is a
hybrid construct including E1-sequences of the serotype enabling
efficient transformation and E1-sequences of another serotype
necessary for serotype-specific complementation. The sequences
providing serotype specific complementation may of course also
contain further activities contributing to transformation.
Preferably, the sequences enabling efficient transformation
comprise E1A. Preferably, the sequences and the sequences necessary
for serotype specific complementation preferably comprise E1B
sequences. More preferably, the sequences enabling efficient
transforming comprise E1A and E1B-21K sequences and the sequences
necessary for serotype specific complementation comprise E1B-55K
sequences. Also provided are cells transformed by such hybrid
construct. Such cells can favorably be used for the propagation of
recombinant E1-deleted adenovirus of another serotype. Of course,
it is also possible to provide both functions of E1 sequences on
separate constructs. In all aspects, the sequences are operatively
linked to regulatory sequences enabling transcription and
translation of the encoded proteins. Preferably, a packaging cell
of the invention further comprises a DNA encoding at least E4-orf6
of an adenovirus of subgroup B, preferably adenovirus serotype 35.
Preferably, the E4-orf6 is derived from the other serotype.
Preferably, the cell comprises E1B-55K and E4-orf6 of the same
serotype as the recombinant vector to be propagated/complemented or
otherwise produced.
[0019] In another aspect of the invention, new packaging cells are
described that are derived from PER.C6 (ECACC deposit number
96022940; Fallaux et al., 1998) and contain Ad35-E1 sequences
integrated into their genome. These Ad35-E1 sequences are present
in a functional expression cassette, but preferably do not contain
sequences overlapping with sequences present in the recombinant
viral vector. Preferably, the functional expression cassette
consists of a heterologous promoter and poly-adenylation signal
functionally linked to Ad35-E1 sequences. More specifically, the
Ad35-E1 coding sequences are functionally linked to the human
phosphoglycerate gene promoter (hPGK) and hepatitis B virus
poly-adenylation signal (HBV-pA). Preferably, Ad35-E1 coding
sequences comprise the coding regions of the E1A proteins and the
E1B promoter sequences linked to E1B coding sequences up to and
including the stop codon of the E1B 55K protein. More preferably,
the Ad35-E1 sequences comprise nucleotide 468 to nucleotide 3400 of
the Ad35 wt sequence. To be able to select for transfected cells, a
dominant selection marker like, but not limited to, the neo.sup.r
gene has to be incorporated on the expression vector or the Ad35
expression vector is cotransfected with a separate expression
vector mediating expression of the selection marker. In both cases,
the selection marker becomes integrated in the cellular genome.
Other Ad5-E1 transformed cell lines like 293 (Graham et al., 1977)
and 911 (Fallaux et al., 1996) or established human cell lines like
A549 cells may be used without departing from the present
invention.
[0020] In another aspect of the invention, PER.C6-derived cells are
described that express functional Ad35-E1B sequences. In one
embodiment, the Ad35-E1B coding sequences are driven by the E1B
promoter and terminated by a heterologous poly-adenylation signal
like, but not limited to, the HBVpA. In a preferred embodiment, the
Ad35-E1B coding sequences are driven by a heterologous promoter
like, but not limited to, the hPGK promoter or Elongation
Factor-1.alpha. (EF-1.alpha.) promoter and terminated by a
heterologous pA signal like, but not limited to, the HBVpA. These
Ad35-E1B sequences preferably comprise the coding regions of the
E1B-21K and the E1B-55K proteins located between nucleotides 1611
and 3400 of the wild-type (wt) Ad35 sequence. More preferably, the
Ad35-E1B sequences comprise nucleotides 1550 to 3400 of the wt Ad35
sequence. In an even more preferred embodiment, the E1B sequences
comprise the coding sequences of the E1B-55K gene located between
nucleotides 1916 and 3400 of the wt Ad35 sequence. In an even more
preferred embodiment a packaging cell line or a cell line of the
invention lacks a functional coding sequence for E1B 21k. Such cell
lines, in general, produce significantly more recombinant
adenovirus than E1B 21K positive cell lines.
[0021] The invention further provides a method for complementing a
recombinant adenovirus comprising providing a packaging cell line
or a cell line according to the invention, with the recombinant
adenovirus and culturing the cell to allow for complementation. In
a preferred embodiment the method further comprises harvesting
complemented recombinant adenovirus. Preferably, the recombinant
adenovirus is derived from adenovirus subgroup B. More preferably,
the recombinant adenovirus is derived from adenovirus serotype
35.
[0022] In another aspect, the invention provides a recombinant
adenovirus obtained by a method of the invention or with a
packaging cell of the invention. Such an adenovirus can be obtained
essentially free from contaminating wild type adenovirus, or
replication competent adenovirus. Such recombinant adenovirus
preparations are very suited for administration of therapeutic
sequences to somatic tissues in vivo in for instance a gene
therapeutic setting. Preferred are recombinant adenoviruses
comprising a deletion of nucleic acid encoding at least one
E1-region protein. Preferably, such adenovirus further comprises a
deletion of nucleic acid encoding at least one E3-region protein.
Preferably, such adenovirus further comprises a deletion of nucleic
acid encoding at least one E4-region protein. Preferably, such
adenovirus further comprises a deletion of nucleic acid encoding at
least one E4-Orf6 protein. For this reason, the invention also
provides the use of a recombinant adenovirus of the invention for
the preparation of a medicament.
[0023] With the term E1B-55K protein as used herein, is meant the
protein encoded by the E1B-region in an adenovirus serotype having
a similar function in the serotype as provided by the E1B-55K
protein Ad5.
[0024] With the term E1B-21K protein as used herein, is meant the
protein enclosed by the E1B-region in an adenovirus serotype having
a similar function in the serotype as provided by the E1B-19K
protein of Ad5. The same terminology applies for the sequences
encoding these proteins. When referring to Ad35-E1 sequences from a
specified nucleotide to nucleotide 3400 is meant "up to and
including nucleotide 3400."
[0025] The cell lines of this invention are useful for, among other
things, producing recombinant adenoviruses designed for gene
therapy and vaccination. The cell lines, being derived from cells
of human origin, are also useful for the production of human
recombinant therapeutic proteins like, but not limited to human
growth factors, human antibodies. In addition the cell lines are
useful for the production of human viruses other than adenovirus
like, but not limited to, influenza virus, herpes simplex virus,
rotavirus, measles virus.
[0026] A preferred derivative of primary, diploid human cells is
the PER.C6 cell line (ECACC deposit number 960022940).
[0027] It is within the skills of the artisan to provide for
proteins having a similar function in kind as the adenovirus E1
protein referred to in this document. For instance a functional
part may be provided and/or a derivative may be provided with a
similar function in kind, not necessarily in amount.
[0028] Such parts and derivatives are considered to be part of the
invention, in as far as similar transforming/complementing and/or
serotype specificity function is provided in kind, not necessarily
in amount.
BRIEF DESCRIPTION OF THE FIGURES
[0029] FIG. 1: Bar graph showing the percentage of serum samples
positive for neutralization for each human wt adenovirus tested
(see, Example 1 for description of the neutralization assay).
[0030] FIG. 2: Graph showing absence of correlation between the
VP/CCID50 ratio and the percentage of neutralization.
[0031] FIG. 3: Bar graph presenting the percentage sera samples
that show neutralizing activity to a selection of adenovirus
serotypes. Sera were derived from healthy volunteers from Belgium
and the UK.
[0032] FIG. 4: Bar graph presenting the percentage sera samples
that show neutralizing activity to adenovirus serotypes 5, 11, 26,
34, 35, 48 and 49. Sera were derived from five different locations
in Europe and the United States.
[0033] FIG. 5: Map of pAdApt35IP1.
[0034] FIG. 6: Schematic representation of the steps undertaken to
construct pWE.Ad35.pIX-rITR.
[0035] FIG. 7: Map of pWE.Ad35.pIX-rITR.
[0036] FIG. 8: Map of pRSV.Ad35-E1.
[0037] FIG. 9 Map of pPGKneopA
[0038] FIG. 10: Map of pRSV-Pneo.
[0039] FIG. 11: Map of pRSVhbv.Neo.
[0040] FIG. 12: Map of pIG.E1A.E1B.
[0041] FIG. 13: Map of pIG135.
[0042] FIG. 14: Map of pIG270.
[0043] FIG. 15: Map of pBr.Ad35.leftITR-pIX.
[0044] FIG. 16: Map of pBr.Ad35.leftITR-pIXdE1A.
[0045] FIG. 17: Map of pBr.Ad35.d21K.
[0046] FIG. 18: Map of pBr.Ad35.d55K1.
[0047] FIG. 19: Map of pBr.Ad35DdSM.
[0048] FIG. 20: Schematic representation of Ad35-E1A/E1B deletion
constructs.
[0049] FIG. 21: Map of pIG.35BL.
[0050] FIG. 22: Map of pRSVneo4.
[0051] FIG. 23: Map of pIG35Bneo.
[0052] FIG. 24: Map of pIG35.55K.
[0053] FIG. 25: Map of pIG535.
[0054] FIG. 26: Map of pIG635.
[0055] FIG. 27: Map of pIG735.
[0056] FIG. 28: Map of pCC271.
[0057] FIG. 29: Map of pCC535s.
[0058] FIG. 30: Map of pCR535E1B.
[0059] FIG. 31: Map of pCC2155s.
[0060] FIG. 32: Map of pCC536s.
[0061] FIG. 33: Map of pIG536.
[0062] FIG. 34: Map of pBr.Ad35.PRn.
[0063] FIG. 35: Map of pBr.Ad35.PRn.DELTA.E3.
[0064] FIG. 36: Map of pWE.Ad35.pIX-rITR.DELTA.E3.
[0065] FIG. 37: Alignment of E1B-21K amino acid sequences in
pCC536s (SEQ ID NO:45), wtAd5 (SEQ ID NO:46) and wtAd35 (SEQ ID
NO:47) (A) and E1B-55K amino acid sequences in pCC536s (SEQ ID
NO:48), wtAd5 (SEQ ID NO:49) and wtAd35 (SEQ ID NO:50) (B).
[0066] The invention is further explained by the use of the
following illustrative examples.
DETAILED DESCRIPTION OF THE INVENTION
Examples
Example 1
A High Throughput Assay for the Detection of Neutralizing Activity
in Human Serum
[0067] To enable screening of a large amount of human sera for the
presence of neutralizing antibodies against all adenovirus
serotypes, an automated 96-wells assay was developed.
Human Sera
[0068] A panel of 100 individuals was selected. Volunteers (50%
male, 50% female) were healthy individuals between ages 20 and 60
years old with no restriction for race. All volunteers signed an
informed consent form. People professionally involved in adenovirus
research were excluded.
[0069] Approximately 60 ml blood was drawn in dry tubes. Within two
hours after sampling, the blood was centrifuged at 2500 rpm for 10
minutes. Approximately 30 ml serum was transferred to polypropylene
tubes and stored frozen at -20.degree. C. until further use.
[0070] Serum was thawed and heat-inactivated at 56.degree. C. for
10 minutes and then aliquoted to prevent repeated cycles of
freeze/thawing. Part was used to make five steps of twofold
dilutions in medium (DMEM, Gibco BRL) in a quantity large enough to
fill out approximately 70 96-well plates. Aliquots of undiluted and
diluted sera were pipetted in deep well plates (96-well format) and
using a programmed platemate dispensed in 100 .mu.l aliquots into
96-well plates. The plates were loaded with eight different sera in
duplo (100 .mu.l/well) according to the scheme below:
TABLE-US-00001 S1/2 S1/4 S1/8 S1/16 S1/32 S5/2 S5/4 S5/8 S5/16
S5/32 -- -- S1/2 S1/4 S1/8 S1/16 S1/32 S5/2 S5/4 S5/8 S5/16 S5/32
-- -- S2/2 S2/4 S2/8 S2/16 S2/32 S6/2 S6/4 S6/8 S6/16 S6/32 -- --
S2/2 S2/4 S2/8 S2/16 S2/32 S6/2 S6/4 S6/8 S6/16 S6/32 -- -- S3/2
S3/4 S3/8 S3/16 S3/32 S7/2 S7/4 S7/8 S7/16 S7/32 -- -- S3/2 S3/4
S3/8 S3/16 S3/32 S7/2 S7/4 S7/8 S7/16 S7/32 -- -- S4/2 S4/4 S3/8
S3/16 S3/32 S8/2 S8/4 S8/8 S8/16 S8/32 -- -- S4/2 S4/4 S3/8 S3/16
S3/32 S8/2 S8/4 S8/8 S8/16 S8/32 -- --
Where S1/2 to S8/2 in columns 1 and 6 represent 1.times. diluted
sera and Sx/4, Sx/8, Sx/16 and Sx/32 the two-fold serial dilutions.
The last plates also contained four wells filled with 100 .mu.l
fetal calf serum as a negative control. Plates were kept at
-20.degree. C. until further use.
Preparation of Human Adenovirus Stocks
[0071] Prototypes of all known human adenoviruses were inoculated
on T25 flasks seeded with PER.C6 cells (Fallaux et al., 1998) and
harvested upon full CPE. After freeze/thawing, 1 to 2 ml of the
crude lysates were used to inoculate a T80 flask with PER.C6 and
virus was harvested at full CPE. The timeframe between inoculation
and occurrence of CPE, as well as the amount of virus needed to
re-infect a new culture, differed between serotypes. Adenovirus
stocks were prepared by freeze/thawing and used to inoculate 3 to 4
T175 cm.sup.2 three-layer flasks with PER.C6 cells. Upon occurrence
of CPE, cells were harvested by tapping the flask, pelleted and
virus was isolated and purified by a two-step CsCl gradient as
follows. Cell pellets were dissolved in 50 ml 10 mM NaPO.sub.4
buffer (pH 7.2) and frozen at -20.degree. C. After thawing at
37.degree. C., 5.6 ml sodium deoxycholate (5% w/v) was added. The
solution was mixed gently and incubated for 5 to 15 minutes at
37.degree. C. to completely lyse the cells. After homogenizing the
solution, 1875 .mu.l 1 M MgCl.sub.2 was added. After the addition
of 375 .mu.L DNAse (10 mg/ml), the solution was incubated for 30
minutes at 37.degree. C. Cell debris was removed by centrifugation
at 1880.times.g for 30 minutes at RT without brake. The supernatant
was subsequently purified from proteins by extraction with FREON
(3.times.). The cleared supernatant was loaded on a 1 M Tris/HCl
buffered cesium chloride block gradient (range: 1.2/1.4 g/ml) and
centrifuged at 21000 rpm for 2.5 hours at 10.degree. C. The virus
band is isolated after which a second purification using a 1 M
Tris/HCl buffered continues gradient of 1.33 g/ml of cesium
chloride was performed. The virus was then centrifuged for 17 hours
at 55000 rpm at 10.degree. C. The virus band is isolated and
sucrose (50% w/v) is added to a final concentration of 1%. Excess
cesium chloride is removed by dialysis (three times 1 hour at RT)
in dialysis slides (Slide-a-lizer, cut off 10000 kDa, Pierce, USA)
against 1.5 liter PBS supplemented with CaCl.sub.2 (0.9 mM),
MgCl.sub.2 (0.5 mM) and an increasing concentration of sucrose (1,
2, 5%). After dialysis, the virus is removed from the slide-a-lizer
after which it is aliquoted in portions of 25 and 100 .mu.l upon
which the virus is stored at -85.degree. C.
[0072] To determine the number of virus particles per milliliter,
50 .mu.l of the virus batch is run on a high-pressure liquid
chromatograph (HPLC) as described by Shabram et al (1997). Viruses
were eluted using a NaCl gradient ranging from 0 to 600 mM. As
depicted in Table I, the NaCl concentration by which the viruses
were eluted differed significantly among serotypes.
[0073] Most human adenoviruses replicated well on PER.C6 cells with
a few exceptions. Adenovirus type 8 and 40 were grown on 911-E4
cells (He et al., 1998). Purified stocks contained between
5.times.10.sup.10 and 5.times.10.sup.12 virus particles/ml (VP/ml;
see table I).
Titration of Purified human adenovirus stocks
[0074] Adenoviruses were titrated on PER.C6 cells to determine the
amount of virus necessary to obtain full CPE in five days, the
length of the neutralization assay. Hereto, 100 .mu.l medium was
dispensed into each well of 96-well plates. Twenty-five .mu.l of
adenovirus stocks pre-diluted 10.sup.4, 10.sup.5, 10.sup.6 or
10.sup.7 times were added to column 2 of a 96-well plate and mixed
by pipetting up and down 10 times. Then 25 .mu.l was brought from
column 2 to column 3 and again mixed. This was repeated until
column 11, after which 25 .mu.l from column 11 was discarded. This
way, serial dilutions in steps of five were obtained starting off
from a pre-diluted stock. Then 3.times.10.sup.4 PER.C6 cells (ECACC
deposit number 96022940) were added in a 100 .mu.l volume and the
plates were incubated at 37.degree. C., 5% CO.sub.2 for five or six
days. CPE was monitored microscopically. The method of Reed and
Muensch was used to calculate the cell culture-inhibiting dose 50%
(CCID50).
[0075] In parallel, identical plates were set up that were analyzed
using the MTT assay (Promega). In this assay, living cells are
quantified by colorimetric staining. Hereto, 20 .mu.l MTT (7.5
mgr/ml in PBS) was added to the wells and incubated at 37.degree.
C., 5% CO.sub.2 for two hours. The supernatant was removed and 100
.mu.l of a 20:1 isopropanol/triton-X100 solution was added to the
wells. The plates were put on a 96-well shaker for 3 to 5 minutes
to solubilize the precipitated staining. Absorbance was measured at
540 nm and at 690 nm (background). By this assay, wells with
proceeding CPE or full CPE can be distinguished.
Neutralization Assay
[0076] Ninety-six-well plates with diluted human serum samples were
thawed at 37.degree. C., 5% CO.sub.2. Adenovirus stocks diluted to
200 CCID50 per 50 .mu.l were prepared and 50 .mu.l aliquots were
added to columns 1 to 11 of the plates with serum. Plates were
incubated for 1 hour at 37.degree. C., 5% CO.sub.2. Then, 50 .mu.l
PER.C6 cells at 6.times.10.sup.5/ml were dispensed in all wells and
incubated for one day at 37.degree. C., 5% CO.sub.2. Supernatant
was removed using fresh pipette tips for each row and 200 .mu.l
fresh medium was added to all wells to avoid toxic effects of the
serum. Plates were incubated for another four days at 37.degree.
C., 5% CO.sub.2. In addition, parallel control plates were set up
in duplo, with diluted positive control sera generated in rabbits
and specific for each serotype to be tested in rows A and B and
with negative control serum (FCS) in rows C and D. Also, in each of
the rows E-H, a titration was performed as described above with
steps of five times dilutions starting with 200 CCID50 of each
virus to be tested. On day 5, one of the control plates was
analyzed microscopically and with the MTT assay. The experimental
titer was calculated from the control titration plate observed
microscopically. If CPE was found to be complete, i.e., the first
dilution in the control titration experiment analyzed by MTT shows
clear cell death, all assay plates were processed. If not, the
assay was allowed to proceed for one or more days until full CPE
was apparent, after which all plates were processed. In most cases,
the assay was terminated at day 5. For Ad1, 5, 33, 39, 42 and 43
the assay was left for six days and for Ad2 for eight days.
[0077] A serum sample is regarded as "non-neutralizing" when, at
the highest serum concentration, a maximum protection of 40% is
seen compared to controls without serum.
[0078] The results of the analysis of 44 prototype adenoviruses
against serum from 100 healthy volunteers are shown in FIG. 1. As
expected, the percentage of serum samples that contained
neutralizing antibodies to Ad2 and Ad5 was very high. This was also
true for most of the lower numbered adenoviruses. Surprisingly,
none of the serum samples contained neutralizing antibodies to
Ad35. Also, the number of individuals with neutralizing antibody
titers to the serotypes 26, 34 and 48 was very low. Therefore,
recombinant E1-deleted adenoviruses based on Ad35 or one of the
other above-mentioned serotypes have an important advantage
compared to recombinant vectors based on Ad5 with respect to
clearance of the viruses by neutralizing antibodies.
[0079] Also, Ad5-based vectors that have parts of the capsid
proteins involved in immunogenic response of the host replaced by
the corresponding parts of the capsid proteins of Ad35 or one of
the other serotypes will be less, or even not, neutralized by the
vast majority of human sera.
[0080] As can be seen in Table I, the VP/CCID50 ratio calculated
from the virus particles per ml and the CCID50 obtained for each
virus in the experiments was highly variable and ranged from 0.4 to
5 log. This is probably caused by different infection efficiencies
of PER.C6 cells and by differences in replication efficiency of the
viruses. Furthermore, differences in batch qualities may play a
role. A high VP/CCID50 ratio means that more viruses were put in
the wells to obtain CPE in five days. As a consequence, the outcome
of the neutralization study might be biased since more inactive
virus particles could shield the antibodies. To check whether this
phenomenon had taken place, the VP/CCID50 ratio was plotted against
the percentage of serum samples found positive in the assay (FIG.
2). The graph clearly shows that there is no negative correlation
between the amount of viruses in the assay and neutralization in
serum.
Example 2
The Prevalence of Neutralizing Activity (NA) to Ad35 is Low in
Human Sera from Different Geographic Locations
[0081] In Example 1, the analysis of neutralizing activity ("NA")
in human sera from one location in Belgium was described.
Strikingly, of a panel of 44 adenovirus serotypes tested, one
serotype, Ad35, was not neutralized in any of the 100 sera assayed.
In addition, a few serotypes, Ad26, Ad34 and Ad48 were found to be
neutralized in 8%, or less, of the sera tested. This analysis was
further extended to other serotypes of adenovirus not previously
tested and, using a selection of serotypes from the first screen,
was also extended to sera from different geographic locations.
[0082] Hereto, adenoviruses were propagated, purified and tested
for neutralization in the CPE-inhibition assay as described in
Example 1. Using the sera from the same batch as in Example 1,
adenovirus serotypes 7B, 11, 14, 18 and 44/1876 were tested for
neutralization. These viruses were found to be neutralized in,
respectively, 59, 13, 30, 98 and 54% of the sera. Thus, of this
series, Ad11 is neutralized with a relatively low frequency.
[0083] Since it is known that the frequency of isolation of
adenovirus serotypes from human tissue, as well as the prevalence
of NA to adenovirus serotypes, may differ on different geographic
locations, we further tested a selection of the adenovirus
serotypes against sera from different places. Human sera were
obtained from two additional places in Europe (Bristol, UK and
Leiden, NL) and from two places in the United States (Stanford,
Calif. and Great Neck, N.Y.). Adenoviruses that were found to be
neutralized in 20% or less of the sera in the first screen, as well
as Ad2, Ad5, Ad27, Ad30, Ad38, Ad43, were tested for neutralization
in sera from the UK. The results of these experiments are presented
in FIG. 3. Adenovirus serotypes 2 and 5 were again neutralized in a
high percentage of human sera. Furthermore, some of the serotypes
that were neutralized in a low percentage of sera in the first
screen are neutralized in a higher percentage of sera from the UK,
for example, Ad26 (7% vs. 30%), Ad28 (13% vs. 50%), Ad34 (5% vs.
27%) and Ad48 (8% vs. 32%). Neutralizing activity against Ad11 and
Ad49 that were found in a relatively low percentage of sera in the
first screen, are found in an even lower percentage of sera in this
second screen (13% vs. 5% and 20% vs. 11%, respectively). Serotype
Ad35 that was not neutralized in any of the sera in the first
screen, was now found to be neutralized in a low percentage (8%) of
sera from the UK. The prevalence of NA in human sera from the UK is
the lowest to serotypes Ad11 and Ad35.
[0084] For further analysis, sera was obtained from two locations
in the US (Stanford, Calif. and Great Neck, N.Y.) and from The
Netherlands (Leiden). FIG. 4 presents an overview of data obtained
with these sera and the previous data. Not all viruses were tested
in all sera, except for Ad5, Ad11 and Ad35. The overall conclusion
from this comprehensive screen of human sera is that the prevalence
of neutralizing activity to Ad35 is the lowest of all serotypes
throughout the western countries: on average 7% of the human sera
contain neutralizing activity (5 different locations). Another
B-group adenovirus, Ad11 is also neutralized in a low percentage of
human sera (average 11% in sera from five different locations).
Adenovirus type 5 is neutralized in 56% of the human sera obtained
from five different locations. Although not tested in all sera,
D-group serotype 49 is also neutralized with relatively low
frequency in samples from Europe and from one location of the US
(average 14%).
[0085] In the herein described neutralization experiments, a serum
is judged non-neutralizing when, in the well with the highest serum
concentration, the maximum protection of CPE is 40% compared to the
controls without serum. The protection is calculated as
follows:
1 % protection = OD corresponding well - OD virus control OD non -
infected control - OD virus control .times. 100 % ##EQU00001##
[0086] As described in Example 1, the serum is plated in five
different dilutions ranging from 4.times. to 64.times. diluted.
Therefore, it is possible to distinguish between low titers (i.e.,
neutralization only in the highest serum concentrations) and high
titers of NA (i.e., also neutralization in wells with the lowest
serum concentration). Of the human sera used in our screen that
were found to contain neutralizing activity to Ad5, 70% turned out
to have high titers, whereas, of the sera that contained NA to
Ad35, only 15% had high titers. Of the sera that were positive for
NA to Ad11, only 8% had high titers. For Ad49, this was 5%.
Therefore, not only is the frequency of NA to Ad35, Ad11 and Ad49
much lower as compared to Ad5, but of the sera that do contain NA
to these viruses, the vast majority have low titers. Adenoviral
vectors based on Ad11, Ad35 or Ad49 have, therefore, a clear
advantage over Ad5-based vectors when used as gene therapy vehicles
or vaccination vectors in vivo or in any application where
infection efficiency is hampered by neutralizing activity.
[0087] In the following examples, the construction of a vector
system for the generation of safe, RCA-free Ad35-based vectors is
described.
Example 3
Sequence of the Human Adenovirus Type 35
[0088] Ad35 viruses were propagated on PER.C6 cells and DNA was
isolated as follows: To 100 .mu.l of virus stock (Ad35:
3.26.times.10.sup.12 VP/ml), 10 .mu.l 10.times.DNAse buffer (130 mM
Tris-HCl pH 7.5; 1.2 M CaCl.sub.2; 50 mM MgCl.sub.2) was added.
After addition of 10 .mu.l 10 mgr/ml DNAse I (Roche Diagnostics),
the mixture was incubated for 1 hour at 37.degree. C. Following
addition of 2.5 .mu.l 0.5M EDTA, 3.2 .mu.l 20% SDS and 1.5 .mu.l
ProteinaseK (Roche Diagnostics; 20 mgr/ml), samples were incubated
at 50.degree. C. for 1 hour. Next, the viral DNA was isolated using
the GENECLEAN spin kit (BIO 101 Inc.) according to the
manufacturer's instructions. DNA was eluted from the spin column
with 25 .mu.l sterile MilliQ water. The total sequence was
generated by Qiagen Sequence Services (Qiagen GmbH, Germany). Total
viral DNA was sheared by sonification and the ends of the DNA were
made blunt by T4 DNA polymerase. Sheared blunt fragments were size
fractionated on agarose gels and gel slices corresponding to DNA
fragments of 1.8 to 2.2 kb were obtained. DNA was purified from the
gel slices by the QIAquick gel extraction protocol and subcloned
into a shotgun library of pUC19 plasmid cloning vectors. An array
of clones in 96-well plates covering the target DNA 8 (+/-2) times
was used to generate the total sequence. Sequencing was performed
on Perkin-Elmer 9700 thermocyclers using Big Dye Terminator
chemistry and AmpliTaq FS DNA polymerase followed by purification
of sequencing reactions using QIAGEN DyeEx 96 technology.
Sequencing reaction products were then subjected to automated
separation and detection of fragments on ABI 377 XL 96 lane
sequencers. Initial sequence results were used to generate a
contiguous sequence and gaps were filled in by primer walking reads
on the target DNA or by direct sequencing of PCR products. The ends
of the virus turned out to be absent in the shotgun library, most
probably due to cloning difficulties resulting from the amino acids
of pTP that remain bound to the ITR sequences after proteinase K
digestion of the viral DNA. Additional sequence runs on viral DNA
solved most of the sequence in those regions, however, it was
difficult to obtain a clear sequence of the most terminal
nucleotides. At the 5' end the sequence portion obtained was
5'-CCAATAATATACCT-3' (SEQ ID NO:1) while at the 3' end, the
obtained sequence portion was 5'-AGGTATATTATTGATGATGGG-3' (SEQ ID
NO:2). Most human adenoviruses have a terminal sequence
5'-CATCATCAATAATATACC-3' (SEQ ID NO:3). In addition, a clone
representing the 3' end of the Ad35 DNA obtained after cloning the
terminal 7 kb Ad35 EcoRI fragment into pBr322 also turned out to
have the typical CATCATCAATAAT . . . sequence. Therefore, Ad35 may
have the typical end sequence and the differences obtained in
sequencing directly on the viral DNA are due to artifacts
correlated with run-off sequence runs and the presence of residual
amino acids of pTP.
[0089] The total sequence of Ad35 with corrected terminal sequences
is given in SEQ ID NO:44. Based sequence homology with Ad5 (Genbank
# M72360) and Ad7 (partial sequence Genbank # X03000) and on the
location of open reading frames, the organization of the virus is
identical to the general organization of most human adenoviruses,
especially the subgroup B viruses. The total length of the genome
is 34,794 basepairs.
Example 4
Construction of a Plasmid-Based Vector System to Generate
Recombinant Ad35-Based Viruses
[0090] A functional plasmid-based vector system to generate
recombinant adenoviral vectors comprises the following components:
[0091] 1. An adapter plasmid comprising a left ITR and packaging
sequences derived from Ad35 and at least one restriction site for
insertion of a heterologous expression cassette and lacking E1
sequences. Furthermore, the adapter plasmid contains Ad35 sequences
3' from the E1B coding region including the pIX promoter and coding
sequences enough to mediate homologous recombination of the adapter
plasmid with a second nucleic acid molecule. [0092] 2. A second
nucleic acid molecule, comprising sequences homologous to the
adapter plasmid, and Ad35 sequences necessary for the replication
and packaging of the recombinant virus, that is, early,
intermediate and late genes that are not present in the packaging
cell. [0093] 3. A packaging cell providing at least functional E1
proteins capable of complementing the E1 function of Ad35.
[0094] Other methods for generating recombinant adenoviruses on
complementing packaging cells are known in the art and may be
applied to Ad35 viruses without departing from the invention. As an
example, the construction of a plasmid-based system, as outlined
above, is described in detail below.
1) Construction of Ad35 adapter plasmids
[0095] The adapter plasmid pAdApt (described in International
Patent Publication WO99/55132) was first modified to obtain adapter
plasmids that contain extended polylinkers and that have convenient
unique restriction sites flanking the left ITR and the adenovirus
sequence at the 3' end to enable liberation of the adenovirus
insert from plasmid vector sequences. Construction of these
plasmids is described below in detail:
[0096] Adapter plasmid pAdApt was digested with SalI and treated
with Shrimp Alkaline Phosphatase to reduce religation. A linker,
composed of the following two phosphorylated and annealed oligos:
ExSalPacF 5'-TCG ATG GCA AAC AGC TAT TAT GGG TAT TAT GGG TTC GAA
TTA ATT AA-3' (SEQ ID NO:4) and ExSalPacR 5'-TCG ATT AAT TAA TTC
GAA CCC ATA ATA CCC ATA ATA GCT GTT TGC CA-3' (SEQ ID NO:5) was
directly ligated into the digested construct, thereby replacing the
SalI restriction site by Pi-PspI, SwaI and PacI. This construct was
designated pADAPT+ExSalPac linker. Furthermore, part of the left
ITR of pAdApt was amplified by PCR using the following primers:
PCLIPMSF: 5'-CCC CAA TTG GTC GAC CAT CAT CAA TAA TAT ACC TTA TTT
TGG-3' (SEQ ID NO:6) and pCLIPBSRGI: 5'-GCG AAA ATT GTC ACT TCC TGT
G-3' (SEQ ID NO:7). The amplified fragment was digested with MunI
and BsrGI and cloned into pAd5/Clip (described in International
Patent Application WO99/55132), which was partially digested with
EcoRI and after purification digested with BsrGI, thereby
re-inserting the left ITR and packaging signal. After restriction
enzyme analysis, the construct was digested with ScaI and SgrAI and
an 800 bp fragment was isolated from gel and ligated into
ScaI/SgrAI digested pADAPT+ExSalPac linker. The resulting
construct, designated pIPspSalAdapt, was digested with SalI,
dephosphorylated, and ligated to the phosphorylated
ExSalPacF/ExSalPacR double-stranded linker previously mentioned. A
clone in which the PacI site was closest to the ITR was identified
by restriction analysis and sequences were confirmed by sequence
analysis. This novel pAdApt construct, termed pIPspAdapt, thus
harbors two ExSalPac linkers containing recognition sequences for
PacI, PI-PspI and BstBI, which surround the adenoviral part of the
adenoviral adapter construct, and which can be used to linearize
the plasmid DNA prior to co-transfection with adenoviral helper
fragments.
[0097] In order to further increase transgene cloning permutations,
a number of polylinker variants were constructed based on
pIPspAdapt. For this purpose, pIPspAdapt was first digested with
EcoRI and dephosphorylated. A linker composed of the following two
phosphorylated and annealed oligos: Ecolinker+: 5'-AAT TCG GCG CGC
CGT CGA CGA TAT CGA TAG CGG CCG C-3' (SEQ ID NO:8) and Ecolinker:
5'-AAT TGC GGC CGC TAT CGA TAT CGT CGA CGG CGC GCC G-3' (SEQ ID
NO:9) was ligated into this construct, thereby creating restriction
sites for AscI, SalI, EcoRV, ClaI and NotI. Both orientations of
this linker were obtained, and sequences were confirmed by
restriction analysis and sequence analysis. The plasmid containing
the polylinker in the order 5' HindIII, KpnI, AgeI, EcoRI, AscI,
SalI, EcoRV, ClaI, NotI, NheI, HpaI, BamHI and XbaI was termed
pIPspAdapt1, while the plasmid containing the polylinker in the
order HindIII, KpnI, AgeI, NotI, ClaI, EcoRV, SalI, AscI, EcoRI,
NheI, HpaI, BamHI and XbaI was termed pIPspAdapt2.
[0098] To facilitate the cloning of other sense or antisense
constructs, a linker composed of the following two oligonucleotides
was designed to reverse the polylinker of pIPspAdapt:
HindXba+5'-AGC TCT AGA GGA TCC GTT AAC GCT AGC GAA TTC ACC GGT ACC
AAG CTT A-3' (SEQ ID NO:10); HindXba-5'-CTA GTA AGC TTG GTA CCG GTG
AAT TCG CTA GCG TTA ACG GAT CCT CTA G-3' (SEQ ID NO:11). This
linker was ligated into HindIII/XbaI digested pIPspAdapt and the
correct construct was isolated. Confirmation was done by
restriction enzyme analysis and sequencing. This new construct,
pIPspAdaptA, was digested with EcoRI and the previously mentioned
Ecolinker was ligated into this construct. Both orientations of
this linker were obtained, resulting in pIPspAdapt3, which contains
the polylinker in the order XbaI, BamHI, HpaI, NheI, EcoRI, AscI,
SalI, EcoRV, ClaI, NotI, AgeI, KpnI and HindIII. All sequences were
confirmed by restriction enzyme analysis and sequencing.
[0099] Adapter plasmids based on Ad35 were then constructed as
follows:
[0100] The left ITR and packaging sequence corresponding to Ad35 wt
sequences nucleotides 1 to 464 (SEQ ID NO:44) were amplified by PCR
on wt Ad35 DNA using the following primers: Primer 35F1: 5'-CGG AAT
TCT TAA TTA ATC GAC ATC ATC AAT AAT ATA CCT TAT AG-3' (SEQ ID
NO:12); Primer 35R2: 5'-GGT GGT CCT AGG CTG ACA CCT ACG TAA AAA
CAG-3' (SEQ ID NO:13). Amplification introduces a PacI site at the
5' end and an AvrII site at the 3' end of the sequence.
[0101] For the amplification, Platinum Pfx DNA polymerase enzyme
(LTI) was used according to manufacturer's instructions, but with
primers at 0.6 .mu.M and with DMSO added to a final concentration
of 3%. Amplification program was as follows: 2 minutes at
94.degree. C. (30 seconds 94.degree. C., 30 seconds at 56.degree.
C., 1 minute at 68.degree. C.) for 30 cycles, followed by 10
minutes at 68.degree. C.
[0102] The PCR product was purified using a PCR purification kit
(LTI) according to the manufacturer's instructions and digested
with PacI and AvrII. The digested fragment was then purified from
gel using the GENECLEAN kit (BIO 101, Inc.). The Ad5-based adapter
plasmid pIPspAdApt-3 was digested with AvrII and then partially
with PacI and the 5762 bp fragment was isolated in an LMP agarose
gel slice and ligated with the above-mentioned PCR fragment
digested with the same enzymes and transformed into
electrocompetent DH10B cells (LTI). The resulting clone is
designated pIPspAdApt3-Ad351ITR.
[0103] In parallel, a second piece of Ad35 DNA was amplified using
the following primers: 35F3: 5'-TGG TGG AGA TCT GGT GAG TAT TGG GAA
AAC-3' (SEQ ID NO:14); 35R4: 5'-CGG AAT TCT TAA TTA AGG GAA ATG CAA
ATC TGT GAG G-3' (SEQ ID NO:15).
[0104] The sequence of this fragment corresponds to nucleotides
3401 to 4669 of wt Ad35 (SEQ ID NO:44) and contains 1.3 kb of
sequences starting directly 3' from the E1B-55k coding sequence.
Amplification and purification were done as previously described
herein for the fragment containing the left ITR and packaging
sequence. The PCR fragment was then digested with PacI and
subcloned into pNEB193 vector (New England Biolabs) digested with
SmaI and PacI. The integrity of the sequence of the resulting clone
was checked by sequence analysis. pNEB/Ad35pF3R4 was then digested
with BglII and PacI and the Ad35 insert was isolated from gel using
the QIAExII kit (Qiagen). pIPspAdApt3-Ad351ITR was digested with
BglII and then partially with PacI. The 3624 bp fragment
(containing vector sequences, the Ad35 ITR and packaging sequences
as well as the CMV promoter, multiple cloning region and polyA
signal) was also isolated using the QIAExII kit (Qiagen). Both
fragments were ligated and transformed into competent DH10B cells
(LTI). The resulting clone, pAdApt35IP3, has the expression
cassette from pIPspAdApt3 but contains the Ad35 left ITR and
packaging sequences and a second fragment corresponding to
nucleotides 3401 to 4669 from Ad35. A second version of the Ad35
adapter plasmid having the multiple cloning site in the opposite
orientation was made as follows:
[0105] pIPspAdapt1 was digested with NdeI and BglII and the 0.7 kbp
band containing part of the CMV promoter, the MCS and SV40 polyA
was isolated and inserted in the corresponding sites of pAdApt35IP3
generating pAdApt35IP1 (FIG. 5).
[0106] pAdApt35.LacZ and pAdApt35.Luc adapter plasmids were then
generated by inserting the transgenes from pcDNA.LacZ (digested
with KpnI and BamHI) and pAdApt.Luc (digested with HindIII and
BamHI) into the corresponding sites in pAdApt35IP1. The generation
of pcDNA.LacZ and pAdApt.Luc is described in International Patent
Publication WO99/55132.
2) Construction of Cosmid pWE.Ad35.pIX-rITR
[0107] FIG. 6 presents the various steps undertaken to construct
the cosmid clone containing Ad35 sequences from bp 3401 to 34794
(end of the right ITR) that are described in detail below.
[0108] A first PCR fragment (pIX-NdeI) was generated using the
following primer set:
TABLE-US-00002 35F5: (SEQ ID NO: 16) 5'-CGG AAT TCG CGG CCG CGG TGA
GTA TTG GGA AAA C- 3' 35R6: (SEQ ID NO: 17) 5'-CGC CAG ATC GTC TAC
AGA ACA G-3'
[0109] DNA polymerase Pwo (Roche) was used according to
manufacturer's instructions, however, with an end concentration of
0.6 .mu.M of both primers and using 50 ngr wt Ad35 DNA as template.
Amplification was done as follows: 2 minutes at 94.degree. C., 30
cycles of 30 seconds at 94.degree. C., 30 seconds at 65.degree. C.
and 1 minute 45 seconds at 72.degree. C., followed by 8 minutes at
68.degree. C. To enable cloning in the TA cloning vector PCR2.1, a
last incubation with 1 unit superTaq polymerase (HT Biotechnology
LTD) for 10 minutes at 72.degree. C. was performed.
[0110] The 3370 bp amplified fragment contains Ad35 sequences from
bp 3401 to 6772 with a NotI site added to the 5' end. Fragments
were purified using the PCR purification kit (LTI).
[0111] A second PCR fragment (NdeI-rITR) was generated using the
following primers: 35F7: 5'-GAA TGC TGG CTT CAG TTG TAA TC-3' (SEQ
ID NO:18); 35R8: 5'-CGG AAT TCG CGG CCG CAT TTA AAT CAT CAT CAA TAA
TAT ACC-3' (SEQ ID NO:19).
[0112] Amplification was done with pfx DNA polymerase (LTI)
according to manufacturer's instructions but with 0.6 .mu.M of both
primers and 3% DMSO using 10 ngr. of wt Ad35 DNA as template. The
program was as follows: 3 minutes at 94.degree. C. and five cycles
of 30 seconds at 94.degree. C., 45 seconds at 40.degree. C., 2
minutes 45 seconds at 68.degree. C. followed by 25 cycles of 30
seconds at 94.degree. C., 30 seconds at 60.degree. C., 2 minutes 45
seconds at 68.degree. C. To enable cloning in the TA-cloning vector
PCR2.1, a last incubation with 1 unit superTaq polymerase for 10
minutes at 72.degree. C. was performed. The 1.6 kb amplified
fragment ranging from nucleotides 33178 to the end of the right ITR
of Ad35, was purified using the PCR purification kit (LTI).
[0113] Both purified PCR fragments were ligated into the PCR2.1
vector of the TA-cloning kit (Invitrogen) and transformed into
STBL-2 competent cells (LTI). Clones containing the expected insert
were sequenced to confirm correct amplification. Next, both
fragments were excised from the vector by digestion with NotI and
NdeI and purified from gel using the GENECLEAN kit (BIO 101, Inc.).
Cosmid vector pWE15 (Clonetech) was digested with NotI,
dephosphorylated and also purified from gel. These three fragments
were ligated and transformed into STBL2 competent cells (LTI). One
of the correct clones that contained both PCR fragments was then
digested with NdeI, and the linear fragment was purified from gel
using the GENECLEAN kit. Ad35 wt DNA was digested with NdeI and the
26.6 kb fragment was purified from LMP gel using agarase enzyme
(Roche) according to the manufacturer's instructions. These
fragments were ligated together and packaged using .lamda.1 phage
packaging extracts (Stratagene) according to the manufacturer's
protocol. After infection into STBL-2 cells, colonies were grown on
plates and analyzed for presence of the complete insert. One clone
with the large fragment inserted in the correct orientation and
having the correct restriction patterns after independent
digestions with three enzymes (NcoI, PvuII and ScaI) was selected.
This clone is designated pWE.Ad35.pIX-rITR. It contains the Ad35
sequences from bp 3401 to the end and is flanked by NotI sites
(FIG. 7).
3) Generation of Ad35-Based Recombinant Viruses on PER.C6
[0114] Wild type Ad35 virus can be grown on PER.C6 packaging cells
to very high titers. However, whether the Ad5-E1 region that is
present in PER.C6 is able to complement E1-deleted Ad35 recombinant
viruses is unknown. To test this, PER.C6 cells were cotransfected
with the above-described adapter plasmid pAdApt35.LacZ and the
large backbone fragment pWE.Ad35.pIX-rITR. First, pAdApt35.LacZ was
digested with PacI and pWE.Ad35.pIX-rITR was digested with NotI.
Without further purification, 4 .mu.gr of each construct was mixed
with DMEM (LTI) and transfected into PER.C6 cells, seeded at a
density of 5.times.10.sup.6 cells in a T25 flask the day before,
using Lipofectamin (LTI) according to the manufacturer's
instructions. As a positive control, 6 .mu.gr of PacI digested
pWE.Ad35.pIX-rITR DNA was cotransfected with a 6.7 kb NheI fragment
isolated from Ad35 wt DNA containing the left end of the viral
genome including the E1 region. The next day, medium (DMEM with 10%
FBS and 10 mM MgCl.sub.2) was refreshed and cells were further
incubated. At day 2 following the transfection, cells were
trypsinized and transferred to T80 flasks. The positive control
flask showed CPE at five days following transfection, showing that
the pWE.Ad35.pIX-rITR construct is functional, at least in the
presence of Ad35-E1 proteins. The transfection with the Ad35 LacZ
adapter plasmid and pWE.Ad35.pIX-rITR did not give rise to CPE.
These cells were harvested in the medium at day 10 and
freeze/thawed once to release virus from the cells. 4 ml of the
harvested material was added to a T80 flask with PER.C6 cells (at
80% confluency) and incubated for another five days. This
harvest/re-infection was repeated two times but there was no
evidence for virus associated CPE.
[0115] From this experiment, it seems that the Ad5-E1 proteins are
not, or not well enough, capable of complementing Ad35 recombinant
viruses. However, it may be that the sequence overlap of the
adapter plasmid and the pWE.Ad35.pIX-rITR backbone plasmid is not
large enough to efficiently recombine and give rise to a
recombinant virus genome. The positive control transfection was
done with a 6.7 kb left end fragment and, therefore, the sequence
overlap was about 3.5 kb. The adapter plasmid and the
pWE.Ad35.pIX-rITR fragment have a sequence overlap of 1.3 kb. To
check whether the sequence overlap of 1.3 kb is too small for
efficient homologous recombination, a co-transfection was done with
PacI digested pWE.Ad35.pIX-rITR and a PCR fragment of Ad35 wt DNA
generated with the above-mentioned 35F1 and 35R4 using the same
procedures as previously described herein. The PCR fragment thus
contains left end sequences up to bp 4669 and, therefore, has the
same overlap sequences with pWE.Ad35.pIX-rITR as the adapter
plasmid pAdApt35.LacZ, but has Ad35-E1 sequences. Following PCR
column purification, the DNA was digested with SalI to remove
possible intact template sequences. A transfection with the
digested PCR product alone served as a negative control. Four days
after the transfection, CPE occurred in the cells transfected with
the PCR product and the Ad35 pIX-rITR fragment, and not in the
negative control. This result shows that a 1.3 kb overlapping
sequence is sufficient to generate viruses in the presence of
Ad35-E1 proteins. From these experiments, we conclude that the
presence of at least one of the Ad35-E1 proteins is necessary to
generate recombinant Ad35 based vectors from plasmid DNA on Ad5
complementing cell lines.
Example 5
1) Construction of Ad35-E1 Expression Plasmids
[0116] Since Ad5-E1 proteins in PER.C6 are incapable of
complementing Ad35 recombinant viruses efficiently, Ad35-E1
proteins have to be expressed in Ad5 complementing cells (e.g.,
PER.C6). Alternatively, a new packaging cell line expressing
Ad35-E1 proteins has to be made, starting from either diploid
primary human cells or established cell lines not expressing
adenovirus E1 proteins. To address the first possibility, the
Ad35-E1 region was cloned in expression plasmids as described
below.
[0117] First, the Ad35-E1 region from bp 468 to bp 3400 was
amplified from wt Ad35 DNA using the following primer set: 35F11:
5'-GGG GTA CCG AAT TCT CGC TAG GGT ATT TAT ACC-3' (SEQ ID NO:20);
35F10: 5'-GCT CTA GAC CTG CAG GTT AGT CAG TTT CTT CTC CAC TG-3'
(SEQ ID NO:21).
[0118] This PCR introduces a KpnI and EcoRI site at the 5' end and
an SbfI and XbaI site at the 3' end.
[0119] Amplification on 5 ngr. template DNA was done with Pwo DNA
polymerase (Roche) using the manufacturer's instructions, however,
with both primers at a final concentration of 0.6 .mu.M. The
program was as follows: 2 minutes at 94.degree. C., five cycles of
30 seconds at 94.degree. C., 30 seconds at 56.degree. C. and 2
minutes at 72.degree. C., followed by 25 cycles of 30 seconds at
94.degree. C., 30 seconds at 60.degree. C. and 2 minutes at
72.degree. C., followed by 10 minutes at 72.degree. C. PCR product
was purified by a PCR purification kit (LTI) and digested with KpnI
and XbaI. The digested PCR fragment was then ligated to the
expression vector pRSVhbvNeo (see below) also digested with KpnI
and XbaI. Ligations were transformed into competent STBL-2 cells
(LTI) according to manufacturer's instructions and colonies were
analyzed for the correct insertion of Ad35-E1 sequences into the
polylinker in between the RSV promoter and HBV polyA.
[0120] The resulting clone was designated pRSV.Ad35-E1 (FIG. 8).
The Ad35 sequences in pRSV.Ad35-E1 were checked by sequence
analysis.
[0121] pRSVhbvNeo was generated as follows: pRc-RSV (Invitrogen)
was digested with PvuII, dephosphorylated with TSAP enzyme (LTI),
and the 3 kb vector fragment was isolated in low melting point
agarose (LMP). Plasmid pPGKneopA (FIG. 9; described in
International Patent Application WO96/35798) was digested with SspI
completely to linearize the plasmid and facilitate partial
digestion with PvuII. Following the partial digestion with PvuII,
the resulting fragments were separated on a LMP agarose gel and the
2245 bp PvuII fragment, containing the PGK promoter,
neomycin-resistance gene and HBVpolyA, was isolated. Both isolated
fragments were ligated to give the expression vector pRSV-pNeo that
now has the original SV40prom-neo-SV40polyA expression cassette
replaced by a PGKprom-neo-HBVpolyA cassette (FIG. 10). This plasmid
was further modified to replace the BGHpA with the HBVpA as
follows: pRSVpNeo was linearized with ScaI and further digested
with XbaI. The 1145 bp fragment, containing part of the Amp gene
and the RSV promoter sequences and polylinker sequence, was
isolated from gel using the GENECLEAN kit (Bio Inc. 101). Next,
pRSVpNeo was linearized with ScaI and further digested partially
with EcoRI and the 3704 bp fragment containing the PGKneo cassette
and the vector sequences were isolated from gel as above. A third
fragment, containing the HBV polyA sequence flanked by XbaI and
EcoRI at the 5' and 3' end, respectively, was then generated by PCR
amplification on pRSVpNeo using the following primer set: HBV-F:
5'-GGC TCT AGA GAT CCT TCG CGG GAC GTC-3' (SEQ ID NO:22) and HBV-R:
5'-GGC GAA TTC ACT GCC TTC CAC CAA GC-3' (SEQ ID NO:23).
[0122] Amplification was done with Elongase enzyme (LTI) according
to the manufacturer's instructions with the following conditions:
30 seconds at 94.degree. C., then five cycles of 45 seconds at
94.degree. C., 1 minute at 42.degree. C. and 1 minute at 68.degree.
C., followed by 30 cycles of 45 seconds at 94.degree. C., 1 minute
at 65.degree. C. and 1 minute at 68.degree. C., followed by 10
minutes at 68.degree. C. The 625 bp PCR fragment was then purified
using the Qiaquick PCR purification kit, digested with EcoRI and
XbaI and purified from gel using the GENECLEAN kit. The three
isolated fragments were ligated and transformed into DH5.alpha.
competent cells (LTI) to give the construct pRSVhbvNeo (FIG. 11).
In this construct, the transcription regulatory regions of the RSV
expression cassette and the neomycin selection marker are modified
to reduce overlap with adenoviral vectors that often contain CMV
and SV40 transcription regulatory sequences.
2) Generation of Ad35 Recombinant Viruses on PER.C6 Cells
Cotransfected with an Ad35-E1 Expression Construct
[0123] PER.C6 cells were seeded at a density of 5.times.10.sup.6
cells in a T25 flask and, the next day, transfected with a DNA
mixture containing:
[0124] 1 .mu.g pAdApt35.LacZ digested with PacI
[0125] 5 .mu.g pRSV.Ad35E1 undigested
[0126] 2 .mu.g pWE.Ad35.pIX-rITR digested with NotI
[0127] Transfection was done using Lipofectamine according to the
manufacturer's instructions. Five hours after addition of the
transfection mixture to the cells, medium was removed and replaced
by fresh medium. After two days, cells were transferred to T80
flasks and further cultured. One week post-transfection, 1 ml of
the medium was added to A549 cells and, the following day, cells
were stained for LacZ expression. Blue cells were clearly visible
after two hours of staining indicating that recombinant LacZ
expressing viruses were produced. The cells were further cultured,
but no clear appearance of CPE was noted. However, after 12 days,
clumps of cells appeared in the monolayer and 18 days following
transfection, cells were detached. Cells and medium were then
harvested, freeze-thawed once, and 1 ml of the crude lysate was
used to infect PER.C6 cells in a six-well plate. Two days after
infection, cells were stained for LacZ activity. After two hours,
15% of the cells were stained blue. To test for the presence of wt
and/or replicating competent viruses, A549 cells were infected with
these viruses and further cultured. No signs of CPE were found
indicating the absence of replication-competent viruses. These
experiments show that recombinant AdApt35.LacZ viruses were made on
PER.C6 cells cotransfected with an Ad35-E1 expression
construct.
[0128] Ad35 recombinant viruses escape neutralization in human
serum containing neutralizing activity to Ad5 viruses.
[0129] The AdApt35.LacZ viruses were then used to investigate
infection in the presence of serum that contains neutralizing
activity to Ad5 viruses. Purified Ad5-based LacZ virus served as a
positive control for NA. Hereto, PER.C6 cells were seeded in a
24-well plate at a density of 2.times.10.sup.5 cells/well. The next
day, a human serum sample with high neutralizing activity to Ad5
was diluted in culture medium in five steps of five times
dilutions. 0.5 ml of diluted serum was then mixed with
4.times.10.sup.6 virus particles AdApt5.LacZ virus in 0.5 ml medium
and after 30 minutes of incubation at 37.degree. C., 0.5 ml of the
mixture was added to PER.C6 cells in duplicate. For the
AdApt35.LacZ viruses, 0.5 ml of the diluted serum samples were
mixed with 0.5 ml crude lysate containing AdApt35.LacZ virus and,
after incubation, 0.5 ml of this mixture was added to PER.C6 cells
in duplo. Virus samples incubated in medium without serum were used
as positive controls for infection. After two hours of infection at
37.degree. C., medium was added to reach a final volume of 1 ml and
cells were further incubated. Two days after infection, cells were
stained for LacZ activity. The results are shown in Table II. From
these results, it is clear that whereas AdApt5.LacZ viruses are
efficiently neutralized, AdApt35.LacZ viruses remain infectious
irrespective of the presence of human serum. This proves that
recombinant Ad35-based viruses escape neutralization in human sera
that contain NA to Ad5-based viruses.
Example 6
Generation of Cell Lines Capable of Complementing E1-deleted Ad35
Viruses
[0130] Generation of pIG135 and pIG270
[0131] Construct pIG.E1A.E1B (FIG. 12) contains E1 region sequences
of Ad5 corresponding to nucleotides 459 to 3510 of the wt Ad5
sequence (Genbank accession number M72360) operatively linked to
the human phosphoglycerate kinase promoter ("PGK") and the
Hepatitis B Virus polyA sequences. The generation of this construct
is described in International Patent Application No. WO97/00326.
The E1 sequences of Ad5 were replaced by corresponding sequences of
Ad35 as follows. pRSV.Ad35-E1 (described in Example 5) was digested
with EcoRI and Sse83871 and the 3 kb fragment corresponding to the
Ad35-E1 sequences was isolated from gel. Construct pIG.E1A.E1B was
digested with Sse83871 completely and partially with EcoRI. The 4.2
kb fragment corresponding to vector sequences without the Ad5-E1
region but retaining the PGK promoter were separated from other
fragments on LMP agarose gel and the correct band was excised from
gel. Both obtained fragments were ligated resulting in
pIG.Ad35-E1.
[0132] This vector was further modified to remove the LacZ
sequences present in the pUC19 vector backbone. Hereto, the vector
was digested with BsaAI and BstXI and the large fragment was
isolated from gel. A double stranded oligo was prepared by
annealing the following two oligos: BB1: 5'-GTG CCT AGG CCA CGG
GG-3' (SEQ ID NO:24) and BB2: 5'-GTG GCC TAG GCA C-3' (SEQ ID
NO:25).
[0133] Ligation of the oligo and the vector fragment resulted in
construct pIG135 (FIG. 13). Correct insertion of the oligo restores
the BsaAI and BstXI sites and introduces a unique AvrII site. Next,
we introduced a unique site at the 3' end of the Ad35-E1 expression
cassette in pIG135. Hereto, the construct was digested with SapI
and the 3' protruding ends were made blunt by treatment with T4 DNA
polymerase. The thus treated linear plasmid was further digested
with BsrGI and the large vector-containing fragment was isolated
from gel. To restore the 3' end of the HBVpolyA sequence and to
introduce a unique site, a PCR fragment was generated using the
following primers: 270F: 5'-CAC CTC TGC CTA ATC ATC TC-3' (SEQ ID
NO:26) and 270R: 5'-GCT CTA GAA ATT CCA CTG CCT TCC ACC-3' (SEQ ID
NO:27).
[0134] The PCR was performed on pIG.Ad35.E1 DNA using Pwo
polymerase (Roche) according to the manufacturer's instructions.
The obtained PCR product was digested with BsrGI and
dephosphorylated using Tsap enzyme (LTI), the latter to prevent
insert dimerization on the BsrGI site. The PCR fragment and the
vector fragment were ligated to yield construct pIG270 (FIG.
14).
Ad35-E1 Sequences are Capable of Transforming Rat Primary Cells
[0135] Newborn WAG/RIJ rats were sacrificed at one week of
gestation and kidneys were isolated. After careful removal of the
capsule, kidneys were disintegrated into a single cell suspension
by multiple rounds of incubation in trypsin/EDTA (LTI) at
37.degree. C. and collection of floating cells in cold PBS
containing 1% FBS. When most of the kidney was trypsinized, all
cells were re-suspended in DMEM supplemented with 10% FBS and
filtered through a sterile cheesecloth. Baby Rat Kidney (BRK) cells
obtained from one kidney were plated in five dishes (Greiner, 6
cm). When a confluency of 70 to 80% was reached, the cells were
transfected with 1 or 5 .mu.gr DNA/dish using the CaPO.sub.4
precipitation kit (LTI) according to the manufacturer's
instructions. The following constructs were used in separate
transfections: pIG.E1A.E1B (expressing the Ad5-E1 region),
pRSV.Ad35-E1, pIG.Ad35-E1 and pIG270 (expressing the Ad35-E1
region). Cells were incubated at 37.degree. C., 5% CO.sub.2 until
foci of transformed cells appeared. Table III shows the number of
foci that resulted from several transfection experiments using
circular or linear DNA. As expected, the Ad5-E1 region efficiently
transformed BRK cells. Foci also appeared in the Ad35-E1
transfected cell layer although with lower efficiency. The Ad35
transformed foci appeared at a later time point: .about.two weeks
post transfection compared with seven to ten days for Ad5-E1. These
experiments clearly show that the E1 genes of the B group virus
Ad35 are capable of transforming primary rodent cells. This proves
the functionality of the Ad35-E1 expression constructs and confirms
earlier findings of the transforming capacity of the B-group
viruses Ad3 and Ad7 (Dijkema, 1979). To test whether the cells in
the foci were really transformed, a few foci were picked and
expanded. From the seven picked foci, at least five turned out to
grow as established cell lines.
Generation of New Packaging Cells Derived from Primary Human
Amniocytes
[0136] Amniotic fluid obtained after amniocentesis was centrifuged
and cells were re-suspended in AmnioMax medium (LTI) and cultured
in tissue culture flasks at 37.degree. C. and 10% CO.sub.2. When
cells were growing nicely (approximately one cell division/24
hours), the medium was replaced with a 1: 1 mixture of AmnioMax
complete medium and DMEM low glucose medium (LTI) supplemented with
Glutamax I (end concentration 4 mM, LTI) and glucose (end
concentration 4.5 gr/L, LTI) and 10% FBS (LTI). For transfection
.about.5.times.10.sup.5 cells were plated in 10 cm tissue culture
dishes. The day after, cells were transfected with 20 .mu.gr of
circular pIG270/dish using the CaPO.sub.4 transfection kit (LTI)
according to manufacturer's instructions and cells were incubated
overnight with the DNA precipitate. The following day, cells were
washed four times with PBS to remove the precipitate and further
incubated for over three weeks until foci of transformed cells
appeared. Once a week the medium was replaced by fresh medium.
Other transfection agents like, but not limited to, LipofectAmine
(LTI) or PEI (Polyethylenimine, high molecular weight, water-free,
Aldrich) were used. Of these three agents, PEI reached the best
transfection efficiency on primary human amniocytes: .about.1% blue
cells 48 hours.
Following Transfection of pAdApt35. LacZ
[0137] Foci are isolated as follows. The medium is removed and
replaced by PBS after which foci are isolated by gently scraping
the cells using a 50 to 200 .mu.l Gilson pipette with a disposable
filter tip. Cells contained in .about.10 .mu.ml PBS were brought in
a 96-well plate containing 15 .mu.l trypsin/EDTA (LTI) and a single
cell suspension was obtained by pipetting up and down and a short
incubation at room temperature. After addition of 200 .mu.l of the
above described 1:1 mixture of AmnioMax complete medium and DMEM
with supplements and 10% FBS, cells were further incubated. Clones
that continued to grow were expanded and analyzed for their ability
to complement growth of E1-deleted adenoviral vectors of different
sub-groups, specifically ones derived from B-group viruses, and
more specifically from Ad35 or Ad11.
Generation of New Packaging Cell Lines from HER Cells
[0138] HER cells are isolated and cultured in DMEM medium
supplemented with 10% FBS (LTI). The day before transfection,
.about.5.times.10.sup.5 cells are plated in 6 cm dishes and
cultured overnight at 37.degree. C. and 10% CO.sub.2. Transfection
is done using the CaPO.sub.4 precipitation kit (LTI) according to
the manufacturer's instructions. Each dish is transfected with 8 to
10 .mu.mgr pIG270 DNA, either as a circular plasmid or as a
purified fragment. To obtain the purified fragment, pIG270 was
digested with AvrII and XbaI and the 4 kb fragment corresponding to
the Ad35-E1 expression cassette was isolated from gel by agarase
treatment (Roche). The following day, the precipitate is washed
away carefully by four washes with sterile PBS. Then fresh medium
is added and transfected cells are further cultured until foci of
transformed cells appear. When large enough (>100 cells), foci
are picked and brought into 96 wells as described above. Clones of
transformed HER cells that continue to grow, are expanded and
tested for their ability to complement growth of E1-deleted
adenoviral vectors of different sub-groups, specifically ones
derived from B-group viruses, and more specifically from Ad35 or
Ad11.
New Packaging Cell Lines Derived from PER.C6
[0139] As described in Example 5, it is possible to generate and
grow Ad35-E1-deleted viruses on PER.C6 cells with cotransfection of
an Ad35-E1 expression construct, e.g., pRSV.Ad35.E1. However,
large-scale production of recombinant adenoviruses using this
method is cumbersome because, for each amplification step, a
transfection of the Ad35-E1 construct is needed. In addition, this
method increases the risk of non-homologous recombination between
the plasmid and the virus genome with high chances of generation of
recombinant viruses that incorporate E1 sequences resulting in
replication-competent viruses. To avoid this, the expression of
Ad35-E1 proteins in PER.C6 has to be mediated by integrated copies
of the expression plasmid in the genome. Since PER.C6 cells are
already transformed and express Ad5-E1 proteins, addition of extra
Ad35-E1 expression may be toxic for the cells. However, it is not
impossible to stably transfect transformed cells with E1 proteins
since Ad5-E1-expressing A549 cells have been generated.
[0140] In an attempt to generate recombinant adenoviruses derived
from subgroup B virus Ad7, Abrahamsen et al. (1997) were not able
to generate E1-deleted viruses on 293 cells without contamination
of wt Ad7. Viruses that were picked after plaque purification on
293-ORF6 cells (Brough et al., 1996) were shown to have
incorporated Ad7-E1B sequences by nonhomologous recombination.
Thus, efficient propagation of Ad7 recombinant viruses proved
possible only in the presence of Ad7-E1B expression and Ad5-E4-ORF6
expression. The E1B proteins are known to interact with cellular as
well as viral proteins (Bridge et al., 1993; White, 1995).
Possibly, the complex formed between the E1B-55K protein and
E4-ORF6 which is necessary to increase mRNA export of viral
proteins and to inhibit export of most cellular mRNAs is critical
and, in some way, serotype-specific. The above experiments suggest
that the E1A proteins of Ad5 are capable of complementing an
Ad7-E1A deletion and that Ad7-E1B expression in adenovirus
packaging cells on itself is not enough to generate a stable
complementing cell line. To test whether one or both of the
Ad35-E1B proteins is/are the limiting factor in efficient Ad35
vector propagation on PER.C6 cells, we have generated an Ad35
adapter plasmid that does contain the E1B promoter and E1B
sequences but lacks the promoter and the coding region for E1A.
Hereto, the left end of wt Ad35 DNA was amplified using the primers
35F1 and 35R4 (both described in Example 4) with Pwo DNA polymerase
(Roche) according to the manufacturer's instructions. The 4.6 kb
PCR product was purified using the PCR purification kit (LTI) and
digested with SnaBI and ApaI enzymes. The resulting 4.2 kb fragment
was then purified from gel using the QIAExII kit (Qiagen). Next,
pAdApt35IP1 (Example 4) was digested with SnaBI and ApaI and the
2.6 kb vector-containing fragment was isolated from gel using the
GENECLEAN kit (BIO 101, Inc). Both isolated fragments were ligated
to give pBr/Ad35.leftITR-pIX (FIG. 15). Correct amplification
during PCR was verified by a functionality test as follows: The DNA
was digested with BstBI to liberate the Ad35 insert from vector
sequences and 4 .mu.g of this DNA was cotransfected with 4 .mu.g of
NotI digested pWE/Ad35.pIX-rITR (Example 4) into PER.C6 cells. The
transfected cells were passaged to T80 flasks at day 2 and again
two days later CPE had formed showing that the new
pBr/Ad35.leftITR-pIX construct contains functional E1 sequences.
The pBr/Ad35.leftITR-pIX construct was then further modified as
follows. The DNA was digested with SnaBI and HindIII and the 5'
HindIII overhang was filled in using Klenow enzyme. Religation of
the digested DNA and transformation into competent cells (LTI) gave
construct pBr/Ad35.leftITR-pIX.DELTA.DE1A (FIG. 16). This latter
construct contains the left end 4.6 kb of Ad35 except for E1A
sequences between bp 450 and 1341 (numbering according to SEQ ID
NO:44) and thus lacks the E1A promoter and most of the E1A coding
sequences. pBr/Ad35.leftITR-pIX.DELTA.DE1A was then digested with
BstBI and 2 .mu.g of this construct was cotransfected with 6
.mu.mgr of NotI digested pWE/Ad35.pIX-rITR (Example 4) into PER.C6
cells. One week following transfection, full CPE had formed in the
transfected flasks.
[0141] This experiment shows that the Ad35-E1A proteins are
functionally complemented by Ad5-E1A expression in PER.C6 cells and
that at least one of the Ad35-E1B proteins cannot be complemented
by Ad5-E1 expression in PER.C6. It further shows that it is
possible to make a complementing cell line for Ad35-E1-deleted
viruses by expressing Ad35-E1B proteins in PER.C6. Stable
expression of Ad35-E1B sequences from integrated copies in the
genome of PER.C6 cells may be driven by the E1B promoter and
terminated by a heterologous poly-adenylation signal like, but not
limited to, the HBVpA. The heterologous pA signal is necessary to
avoid overlap between the E1B insert and the recombinant vector,
since the natural E1B termination is located in the pIX
transcription unit that has to be present on the adenoviral vector.
Alternatively, the E1B sequences may be driven by a heterologous
promoter like, but not limited to, the human PGK promoter or by an
inducible promoter like, but not limited to, the 7xtetO promoter
(Gossen and Bujard, 1992). Also, in these cases, the transcription
termination is mediated by a heterologous pA sequence, e.g., the
HBV pA. The Ad35-E1B sequences at least comprise one of the coding
regions of the E1B-21K and the E1B-55K proteins located between
nucleotides 1611 and 3400 of the wt Ad35 sequence. The insert may
also include part of the Ad35-E1B sequences between nucleotides
1550 and 1611 of the wt Ad35 sequence (SEQ ID NO:44).
Example 7
Ad35-Based Viruses Deleted for E1A and E1B-21K Genes Efficiently
Propagate on Ad5 Complementing Cell Lines
[0142] The generation of Ad35-based viruses that are deleted for
E1A and retain the full E1B region is described in Example 6 of
this application. Such viruses can be generated and propagated on
the Ad5 complementing cell line PER.C6. The E1B region comprises
partially overlapping coding sequences for the two major proteins
21K and 55K (Bos et al., 1981). Whereas, during productive wt
adenoviral infection, both 21K and 55K are involved in
counteracting the apoptose-inducing effects of E1A proteins, the
E1B-55K protein has been suggested to have additional functions
during the late phase of virus infection. These include the
accumulation of viral mRNAs, the control of late viral gene
expression and the shutoff of most host mRNAs at the level of mRNA
transport (Babiss et al., 1984, 1985; Pilder et al., 1986). A
complex formed between E1B-55K and the ORF6 protein encoded by the
adenovirus early region 4 (Leppard and Shenk, 1989; Bridge and
Ketner, 1990) exerts at least part of these functions.
[0143] To analyze which of the E1B proteins is required for
propagation of Ad35-E1A-deleted recombinant viruses on PER.C6
packaging cells, the E1B region in construct
pBr.Ad35.leftITR-pIX.DELTA.E1A (see Example 6 and FIG. 16) was
further deleted. A first construct, pBr.Ad35.DELTA.21K, retains the
full E1B-55K sequence and is deleted for E1A and E1B-21K. Hereto,
pBr.Ad35.leftITR-pIX.DELTA.E1A was digested with NcoI and BspE1 and
the 5 KB vector fragment was isolated from agarose gel using the
GENECLEAN kit (BIO 101, Inc.) according to the manufacturer's
instructions. Then a PCR fragment was generated with
pBr.Ad35.leftITR-pIX.DELTA.E1A as template DNA using the following
primers: 35D21: 5'-TTA GAT CCA TGG ATC CCG CAG ACT C-3' (SEQ ID
NO:28) and 35B3: 5'-CCT CAG CCC CAT TTC CAG-3' (SEQ ID NO:29).
Amplification was done using Pwo DNA polymerase (Roche) according
to manufacturer's recommendations with the addition of DMSO (final
concentration 3%) in the reaction mixture. The PCR program was as
follows: 94.degree. C. for 2 minutes, then 30 cycles of 94.degree.
C. for 30 seconds, 58.degree. C. for 30 seconds and 72.degree. C.
for 45 seconds and a final step at 68.degree. C. for 8 minutes to
ensure blunt ends.
[0144] This PCR amplifies Ad35-E1B sequences from nucl. 1908 to
2528 (sequence Ad35, SEQ ID NO:44) and introduces an NcoI site at
the start codon of the E1B-55K coding sequence (bold in primer
35D21). The 620 bp PCR fragment was purified using the PCR
purification kit (Qiagen) and then digested with NcoI and BspEI,
purified from agarose gel as above and ligated to the
above-described NcoI/BspEI digested vector fragment to give
pBr.Ad35.DELTA.21K (FIG. 17).
[0145] Since the coding regions of the 21K and 55K proteins
overlap, it is only possible to delete part of the 55K coding
sequences while retaining 21K. Hereto,
pBr.Ad35.leftITR-pIX.DELTA.E1A was digested with BglII and the
vector fragment was religated to give pBr.Ad35.DELTA.55K1 (FIG.
18). This deletion removes E1B coding sequences from nucl. 2261 to
3330 (Ad35 sequence in SEQ ID NO:44). In this construct the
N-terminal 115 amino acids are retained and become fused to 21
additional amino acids out of the proper reading frame before a
stop codon is encountered. The 21K coding region is intact in
construct pBr.Ad35.DELTA.55K1.
[0146] A third construct that has a deletion of E1A, 21K and most
of the 55K sequences was generated as follows. pBr.Ad35.leftITR-pIX
(FIG. 15) was digested with SnaBI and MfeI (isoschizomer of MunI)
and the 5' overhang resulting from the MfeI digestion was filled in
using Klenow enzyme. The 4.4 kb vector fragment was isolated from
gel using the GENECLEAN kit (BIO 101, Inc.) according to the
manufacturer's instructions and religated to give construct
pBr.Ad35ASM (FIG. 19). In this construct, the Ad35 sequences
between nucl. 453 and 2804 are deleted. Thus, 596 nucl. of the 3'
end of E1b-55K are retained. A further deletion of 55K sequences
was made in construct pBr.Ad35.DELTA.E1A..DELTA.E1B by digestion of
pBr.Ad35.leftITR-pIX with SnaBI and BglII, Klenow treatment to fill
in the BglII cohesive ends, and religation. FIG. 20 shows a
schematic representation of the above-mentioned constructs.
[0147] To test whether Ad35-based viruses can be generated with
these constructs, each of the constructs was cotransfected with
NotI digested pWE.Ad35pIX-rITR (see, Example 4) onto PER.C6 cells.
Hereto, the respective fragments were PCR amplified using primers
35F1 and 35R4 (see, Example 4). This PCR amplification was done
since some of the constructs were difficult to isolate in large
enough quantities. In this way, equal quality of the different
adapter fragments was ensured. For the amplification, Pwo DNA
polymerase (Roche) was used according to the manufacturer's
instructions but with DMSO (3% final concentration) added to the
PCR mixture. Of each template .about.50 ng DNA was used. The
conditions for the PCR were as follows: 94.degree. C. for 2
minutes, then five cycles of 94.degree. C. for 30 seconds,
48.degree. C. for 45 seconds and 72.degree. C. for 4 minutes,
followed by 25 cycles of 94.degree. C. for 30 seconds, 60.degree.
C. for 30 seconds and 72.degree. C. for 4 minutes and a final step
at 68.degree. C. for 8 minutes.
[0148] PCR fragments were generated from pBr.Ad35leftITR-pIX,
pBr.Ad35.leftITR-pIX.DELTA.E1A, pBr.Ad35A21K, pBr.Ad35.DELTA.55K1,
pBr.Ad35.DELTA.SM and pBr.Ad35.DELTA.E1A.DELTA.E1B. All fragments
were using the PCR purification kit (Qiagen) according to
manufacturer's instructions and final concentrations were estimated
on EtBr stained agarose gel using the Eagle Eye II Still Video
system and EagleSight software (Stratagene) with the SmartLadder
molecular weight marker (Eurogentec) as reference.
[0149] PER.C6 cells were seeded at a density of 2.5.times.10.sup.6
cells in a T25 culturing flask in DMEM containing 10% fetal calf
serum (FCS) and 10 mM MgSO.sub.4 and cultured in a humidified stove
at 37.degree. C., 10% CO.sub.2. The next day, 3 mg of each of the
PCR fragments was cotransfected with 5 .mu.gr NotI digested
pWE.Ad35pIX-rITR using LipofectAmine (GIBCO, Life Technologies
Inc.) according to the manufacturer's instructions. Two days after
the transfection, all cells were passed to a T80 flask and further
cultured. Cultures were then monitored for the appearance of CPE.
In line with the outcome of previous experiments described in
Examples 4 and 6, pBr.Ad35.leftITR-pIX and
pBr.Ad35.leftITR-pIX.DELTA.E1A showed almost full CPE within one
week following transfection. Of the fragments with different E1B
deletions, only pBr.Ad35.DELTA.21K showed CPE at the same time as
the above two fragments. Constructs pBr.Ad35.DELTA.55K1,
pBr.Ad35.DELTA.SM and pBr.Ad35.DELTA.E1A.DELTA.E1B did not give CPE
at all, not even after harvesting by freeze-thawing and
re-infection of the crude lysate onto fresh PER.C6 cells.
[0150] From these experiments, it can be concluded that
Ad35-E1B-55K, and not E1B-21K, is necessary for generation and
propagation of Ad35-based viruses on Ad5 complementing cell lines.
Therefore, Ad35-based viruses having a deletion of the E1A and
E1B-21K genes and having the E1B-55K gene or a functional fragment
thereof, can be grown on Ad5 complementing cell lines.
Alternatively, Ad35-based viruses can be grown on PER.C6 cells that
stably express the full E1B region or the E1B-55K gene, or a
functional fragment thereof. The Ad35-E1B-55K gene, or functional
parts thereof, may be expressed from a heterologous promoter like,
but not limited to, the human PGK promoter, the human
cytomegalovirus immediate early promoter (CMV), Rous sarcoma virus
promoter, etc., and terminated by a heterologous poly adenylation
sequence (pA) like, but not limited to, the hepatitis B virus poly
adenylation sequence (HBVpA) and the Simian Virus 40 poly
adenylation sequence (SV40pA), etc. As nonlimiting examples, PER.C6
cells that express the Ad35-E1B region driven by the E1B promoter
and HBVpA, PER.C6 cells that express the Ad35-E1B region driven by
the human PGK promoter and HBVpA and PER.C6 cells that express a
functional fragment of Ad35-E1B-55K driven by the human PGK
promoter and HBVpA are described below.
[0151] We describe the generation of two expression constructs,
pIG.35BS and pIG.35BL, that both carry the Ad35-E1B genes and a
neomycin selection marker. The two constructs differ in the length
of the fragment containing the E1B promoter. In 35BL, the promoter
fragment is longer and includes the 3' end of the E1A region (103
nucl. coding sequence and pA). The E1B region is terminated by the
HBVpolyA and the neo.sup.r gene is driven by a hPGK promoter/HBVpA
cassette.
[0152] pIG.35BL was made as follows. Construct pRSV.Ad35E1
(described in Example 5, FIG. 8) was digested with NruI and HindIII
and the protruding ends were filled in by Klenow treatment. The 7
kb vector fragment was separated from the smaller fragment on gel
and isolated using the GENECLEAN kit (BIO 101, Inc.). After
religation of the DNA and transformation into competent STBL2 cells
(Gibco, LTI), correct clones were isolated. pIG.35BL (FIG. 21)
contains 273 nucl. upstream of the start site of the E1B-21K coding
region.
[0153] pIG.35BS was made in the same way as pIG.35BL except that
pRSV.Ad35E1 was digested with NruI and HpaI (both enzymes leave
blunt ends), resulting in a shorter fragment upstream of the coding
region of E1B-21K: 97 nucleotides.
[0154] To generate Ad35-E1B expressing cells, PER.C6 cells were
seeded in 10 cm dishes at 1.times.10.sup.6 cells/dish. Two days
later, cells were transfected with ScaI linearized constructs. Four
dishes were transfected with 1 .mu.g and four with 2 .mu.g DNA
(total of 16 dishes; Lipofectamine (Gibco, LTI), no carrier DNA
used) according to the manufacturer's instructions. The next day,
transfected cells received G418-containing medium (0.75 mg/ml).
Control transfections using LacZ expression constructs (2 .mu.g)
were stained after 48 hours and showed a transfection efficiency of
.about.25%. Four days following addition of selection medium,
untransfected cells started to die and again, three days later,
clones were becoming visible. A week later, the first clones were
picked. Transfection with 1 .mu.g resulted in less and also,
initially, smaller clones (total .about.20 clones/dish against
>50 clones/dish for the transfection with 2 .mu.g DNA). The
positive control transfection using 2 .mu.g pcDNA3 (Invitrogen)
resulted in .about.50 clones.
[0155] In total, 120 clones were picked and 107 were successfully
established (55 from pIG35BS and 52 from pIG35BL).
Generation of pIG35Bneo
[0156] pIG35Bneo is an Ad35-E1B expression plasmid from which the
E1B genes are expressed from a heterologous promoter (hPGK) and
that also contains a neomycin resistance expression cassette. To
avoid instability of the plasmid due to recombination events on
homologous sequences, the RSV promoter drives the neo.sup.r gene.
To achieve this, construct pRSVhbv.Neo (described in Example 5,
FIG. 11) was digested with ScaI and BamHI and protruding ends were
filled in using Klenow enzyme. The 1070 bp fragment containing part
of the Ampicilin gene and the RSV promoter was isolated from gel
using the GENECLEAN kit (BIO 101, Inc.). Next, pRSVhbvNeo was
digested with ScaI and EcoRI, blunted with Klenow and the 3.2 kb
fragment containing the neo gene, HBVpA, vector and part of the
Ampicilin gene was isolated as above. The two fragments were then
ligated to give pRSVneo4 (FIG. 22). Construct pIG270 (FIG. 14,
described in Example 6) was then digested with EcoRI and NcoI and
sticky ends were blunted with Klenow enzyme. The vector-containing
fragment was isolated from gel as described above and religated to
give pIG270delE1A. This construct was digested with AvrII and XbaI
and protruding ends were filled in using Klenow enzyme. The 2.9 kb
fragment containing the hPGK promoter and Ad35-E1B sequences was
isolated from gel as above. Next, pRSVneo4 was digested with BglII,
blunted with Klenow enzyme, dephosphorylated and isolated from gel.
The blunted AvrII/XbaI Ad35-E1B fragment was then ligated with the
above prepared pRSVneo4 vector fragment and resulting clones were
analyzed. One clone that contained both expression cassettes in the
same orientation was chosen and named pIG35Bneo (FIG. 23). Detailed
analysis of this clone revealed that an extra BglII site was
present, probably due to an incomplete Klenow reaction (BglII site
at nucl. 2949 in FIG. 23).
Generation of pIG35.55K
[0157] Construct pIG35.55K is similar to pIG35Bneo, however, it
lacks the coding region of Ad35-E1B-21K. Hereto, both the E1A and
E1B-21K sequences are first deleted from pIG270 as follows:
[0158] Construct pIG270 is digested with EcoRI, treated with Klenow
enzyme and purified using a PCR purification kit (Qiagen) according
to the manufacturer's instructions. The recovered DNA is then
digested with AgeI and the .about.5 kb vector fragment was isolated
from gel as above. Next, Ad35-E1B-55K sequences are amplified by
PCR on pIG270 template DNA using the following primers: 35D21:
5'-TTA GAT CCA TGG ATC CCG CAG ACT C-3' (SEQ ID NO:28) and 35B3:
5'-CCT CAG CCC CAT TTC CAG-3' (SEQ ID NO:29). The conditions used
for the amplification are as previously described. The PCR fragment
is purified using the PCR purification kit (Qiagen) and digested
with NcoI. Following Klenow treatment to fill in the protruding
ends, the DNA is further digested with AgeI and again column
purified. The thus treated PCR fragment is then cloned into the
above prepared EcoRI/AgeI digested vector fragment to give
pIG270..DELTA.E1A.DELTA.21K. The last steps to obtain pIG35.55K
(FIG. 24) are equivalent to the last steps described above for the
generation of pIG35Bneo, starting with pIG270..DELTA.E1AA21K
instead of pIG270..DELTA.E1A.
[0159] pIG35.55K is then linearized with ScaI and used to transfect
PER.C6 cells as described above. Clones that are resistant to G418
selection are picked and analyzed for their ability to complement
the propagation of E1-deleted Ad35 viruses.
Example 8
New Packaging Cell Lines for the Generation and Propagation of
E1-Deleted Ad35-Based Vectors Derived from Primary Human Cells
[0160] The complete morphological transformation of primary cells
by adenovirus E1 genes is the result of the combined activities of
the proteins encoded by the E1A and E1B regions. The roles of the
different E1 proteins in lytic infection and in transformation have
been studied extensively (reviewed in Zantema and van der Eb, 1995;
White, 1995, 1996). The adenovirus E1A proteins are essential for
transformation of primary cells. The E1A proteins exert this effect
through direct interaction with a number of cellular proteins that
are involved in regulation of transcription. These include the pRB
family of proteins, p300/CBP and TATA binding protein. In addition
to this, E1A increases the level of p53 protein in the cells. In
the absence of adenovirus E1B activity, the rise in p53 levels
leads to the induction of apoptosis. Both proteins encoded by the
E1B region counteract the induction of apoptosis, although by
different mechanisms. E1B-21K seems to counteract apoptosis in a
manner similar to Bcl-2 via interaction with the effector proteins
downstream in the apoptosis pathway (Han et al., 1996), whereas
E1B-55K functions through direct interaction with p53. Importantly,
the molecular mechanism by which the E1B-55K proteins of Ad2 and 5
(subgroup C) and Ad12 (subgroup A) function in the ability to
neutralize p53 may differ. Whereas Ad5 E1B-55K binds p53 strongly
and the complex localizes to the cytoplasm, Ad12-E1B-55K binds p53
weakly and both proteins are localized in the nucleus (Zantema et
al., 1985; Grand et al., 1999). Both proteins, however, inhibit the
transactivation of other genes by p53 (Yew and Berk, 1992).
[0161] In rodent cells, the activity of E1A, together with either
E1B-21K or 55K, is sufficient for full transformation, although
expression of both E1B proteins together is twice as efficient (Rao
et al., 1992). In human cells, however, the activity of the E1B-55K
protein seems to be more important, given the observation that
E1B-55K is indispensable for the establishment of transformed cells
(Gallimore, 1986).
[0162] Example 6 hereof describes the generation of pIG270. In this
construct, the Ad35-E1 genes are expressed from the hPGK promoter
and transcription is terminated by the HBVpA. The hPGK promoter
constitutes a HincII-EcoRI fragment of the promoter sequence
described by Singer-Sam et al. (1984). The HBVpA is located in a
BamHI-BglII fragment of the Hepatitis B virus genome (Simonsen and
Levinson, 1983; see also Genbank HBV-AF090841). As mentioned
before, the promoter and polyadenylation sequences of the E1
expression constructs described in this invention may be derived
from other sources without departing from the invention. Also,
other functional fragments of the hPGK and HBVpA sequences
mentioned above may be used.
[0163] The functionality of pIG270 was shown by transformation of
primary Baby Rat Kidney cells (BRK). Comparison with an equivalent
Ad5-E1 expression construct taught that Ad35-E1 genes were less
efficient in transforming these cells. The same has been found for
the E1 genes of Ad12 (Bernards et al., 1982).
[0164] It is unclear which E1 protein(s) determine(s) the
difference in transformation efficiency of E1 sequences observed
for adenoviruses from different subgroups. In the case of Ad12,
transfection studies with chimeric E1A/E1B genes suggested that the
efficiency of transformation of BRK cells was determined by the E1A
proteins (Bernards et al., 1982). The E1B-55K protein is shown
infra to contain serotype-specific functions necessary for
complementation of E1-deleted adenoviruses. If these functions are
related to the regulation of mRNA distribution or another late
viral function, it is unlikely that these are involved in the
transformation efficiency.
[0165] Analysis of functional domains in the Ad2 or Ad5-E1B-55K
proteins using insertion mutants have revealed that functions
related to viral replication, late protein synthesis and host
protein shut-off are not confined to specific domains but are
distributed along the protein (Yew et al., 1990). Using the same
set of mutants, the domains important for interaction with p53 and
E4-Orf6 were found to be more restricted. In addition to one common
binding region (amino acids 262 to 326), p53 binding was affected
by mutations at aa 180 and E4-Orf6 binding was affected by
mutations at aa 143 (Yew and Berk, 1992; Rubenwolf et al.,
1997).
[0166] Altogether, these results indicate that it is difficult to
separate the E1B-55K functions related to transformation (p53
binding) and late protein synthesis (Orf6 binding).
[0167] The invention discloses new E1 constructs that combine the
high efficiency of transformation of one serotype with the
serotype-specific complementation function of another serotype.
These new constructs are used to transform primary human embryonic
retinoblast cells and human amniocytes.
The Generation of pIG535, pIG635 and pIG735
[0168] Construct pIG535 contains the Ad5-E1A region and E1B
promoter sequences linked to the Ad35-E1B sequences. Hereto, pIG270
(FIG. 14; see Example 6) was digested with EcoRI and NcoI. The 5.3
kb vector fragment was then isolated from gel using the GENECLEAN
kit (BIO Inc. 101) according to the instructions of the
manufacturer. Next, construct pIG.E1A.E1B (FIG. 12; see Example 6)
was digested with EcoRI and XbaI and the resulting 890 bp fragment
was isolated as above. A third fragment was generated by PCR
amplification on pIG.E1A.E1B using the following primers: 5E1A-F:
5'-GAG ACG CCC GAC ATC ACC TG-3' (SEQ ID NO:30) and 5E1B-R: 5'-CAA
GCC TCC ATG GGG TCA GAT GTA AC-3' (SEQ ID NO:31). The following PCR
program was used: 94.degree. C. for 2 minutes followed by 30 cycles
of 94.degree. C. for 30 seconds, 60.degree. C. for 30 seconds and
72.degree. C. for 1 minute, and a final step at 72.degree. C. for
10 minutes to ensure blunt ends.
[0169] The resulting 400 bp PCR fragment was digested with XbaI and
NcoI. After gel isolation as above, the three fragments were
ligated and transformed into STBL-2 bacteria. One colony containing
all three fragments in the correct order was selected and
designated pIG535 (FIG. 25).
[0170] Construct pIG635 contains the Ad5-E1A and a chimeric
Ad5-Ad35-E1B region such that the 21K sequence is essentially from
Ad5 and linked to the Ad35-E1B-55K sequences as far as not
overlapping with the 21K sequences. First, part of the Ad5-E1
sequences are amplified by PCR using pIG.E1A.E1B as template and
the following primers: 5AK: 5'-GAG CGA AGA AAC CCA TCT GAG-3' (SEQ
ID NO:32) and 2155R: 5'-GGT CCA GGC CGG CTC TCG G-3' (SEQ ID
NO:33). Amplification is accomplished with Pwo DNA polymerase
(Roche) according to manufacturer's instructions. The 210 bp
fragments are then purified from the primer sequences using the PCR
purification kit (Qiagen).
[0171] A second PCR fragment is amplified from pIG270 DNA as
described above but with the following primers: 2155F: 5'-CCG AGA
GCC GGC CTG GAC-3' (SEQ ID NO:34) and 35F10: 5'-GCT CTA GAC CTG CAG
GTT AGT CAG TTT CTT CTC CAC TG-3' (SEQ ID NO:35).
[0172] The 1.3 kb amplified fragment is purified as above and mixed
in a 1:1 molar ratio with the first PCR fragment. The mixture is
then first subjected to a PCR reaction without the addition of
primers using Pwo DNA polymerase and the following program:
94.degree. C. for 2 minutes and then five cycles of 94.degree. C.
for 30 seconds, 60.degree. C. for 30 seconds, 72.degree. C. for 90
seconds. Subsequently, primers 5AK and 35F10 are added at 0.6 .mu.m
concentration after which a last PCR amplifies a 1.5 kb fragment.
Hereto, temperature was set as follows: 94.degree. C. for 2
minutes, then 30 cycles of 94.degree. C. for 30 seconds, 60.degree.
C. for 30 seconds and 72.degree. C. for 90 seconds, followed by a
final step at 72.degree. C. for 10 minutes to ensure blunt ends.
The resulting product is purified using the PCR purification kit
(Qiagen) as above and digested with KpnI and SbfI (isoschizomer of
Sse83871). The digested DNA is then isolated from gel using the
GENECLEAN kit (BIO Inc., 101). Construct pIG.E1A.E1B is digested
with KpnI and SbfI and the vector-containing fragment is isolated
from gel as above. This fragment is ligated to the above prepared
final PCR product and the ligation mixture is transformed into
STBL-2 cells (Gibco, LTI) according to manufacturer's instructions.
This gives construct pIG635 (FIG. 26).
[0173] In construct pIG735, the border between Ad5 derived
sequences and Ad35 derived sequences is located more 3' than in
construct pIG635. First, a BspEI site is introduced in the Ad5
sequence of construct pIG.E1A.E1B without changing the amino acid
sequence. Hereto, Ad5 sequences from pIG.E1A.E1B are amplified
using the following PCR primers:
[0174] 5AK: see above (SEQ ID NO:32), and Bsp-R: 5'-GCT CTA GAC CTG
CAG GGT AGC AAC AAT TCC GGA TAT TTA CAA G-3' (SEQ ID NO:36).
Amplification is accomplished using Pwo DNA polymerase (Roche)
according to the manufacturer's instruction. The following PCR
program is used: 94.degree. C. for 2 minutes followed by 30 cycles
of 94.degree. C. for 30 seconds, 60.degree. C. for 30 seconds and
72.degree. C. for 30 seconds, and a final step at 72.degree. C. for
10 minutes to ensure blunt ends. The resulting 0.6 kb fragment is
purified as above and digested with KpnI and SbfI and ligated to
the above described KpnI/SbfI digested pIG.E1A.E1B vector fragment.
Selection of colonies after transformation of STBL-2 bacteria (Life
Techn. Inc.) gives construct pIG.E1A55K. pIG.E1A55K is then
digested with SbfI and partially with BspEI. The 6.4 kb
SbfI-partial BspEI digested vector fragment is then isolated from
gel using the GENECLEAN kit (BIO 101, Inc.). Next, pIG270 is
digested with BspEI and SbfI and the resulting 915 bp fragment is
isolated from gel as above. This fragment is then ligated to the
above prepared SbfI/partial BspEI digested pIG.E1.DELTA.55K vector
fragment and transformed into STBL-2 competent cells. This gives
construct pIG735 (FIG. 27). Clones are analyzed by restriction
enzyme digestion and sequencing to ensure correct ligation of the
fragments. Constructs pIG535, pIG635 and pIG735 can be used to
generate complementing cell lines from primary human cells as
described in Example 6.
Example 9
PER.C6-Based Complementing Cell Lines for E1-Deleted Ad35
Viruses
[0175] PER.C6 cells were seeded in 10 cm culture dishes at a
density of 3.times.10.sup.6 cells/dish in DMEM (Gibco BRL)
complemented with FBS (Gibco BRL) up to 10% and 10 mM MgCl.sub.2
(4.9 M stock solution, Sigma). Two days later, nine dishes were
transfected with 1 .mu.g ScaI linearized pIG35.55K DNA (see Example
7) and nine dishes were transfected with 1.5 .mu.g ScaI linearized
pIG35.55K DNA. Separate control dishes were transfected with 1 or
1.5 .mu.g ScaI linearized pAdApt35.LacZ to monitor transfection
efficiency and with 1 or 1.5 .mu.g ScaI linearized pcDNA.nlsLacZ.
pcDNA.nlsLacZ is a pcDNA3-based plasmid (Invitrogen) with the
nlsLacZ gene (Bonnerot et al., 1987) driven by the CMV promoter.
pcDNA.nlsLacZ also contains a neo.sup.r expression cassette. As a
negative control one extra dish was transfected with linearized
pAdApt35.LacZ, a construct that lacks the neo.sup.r selection gene.
All transfections were performed with the LipofectAmine
transfection kit (Invitrogen/Life Technologies) according to
manufacturers' instructions using 5 ml LipofectAmine reagent/.mu.g
DNA. Cells were incubated for 4 hours with the transfection mixture
after which the medium was replaced with PER.C6 culture medium. The
next day medium was replaced with culture medium containing 0.5
mg/ml G418 (Gibco BRL) except in the two dishes that were
transfected with 1 or 1.5 .mu.g pAdApt35.LacZ. These latter dishes
were used to monitor LacZ expression two days following
transfection. After X-gal staining of these cultures transfection
efficiency was estimated at approximately 40% with slightly more
blue cells in the dish transfected with 1.5 .mu.g DNA. Selection
medium was refreshed twice weekly in the remaining transfected
dishes. Within two weeks following first addition of selection
medium most cells in the negative control dish (transfected with
1.5 .mu.g pAdApt35.LacZ) were dead. In the dishes transfected with
pcDNA.nlsLacZ cell clones were becoming visible. Since the cells
transfected with pIG35.55K seemed to be more resistant to G418, the
concentration was raised to 0.75 mg/ml three weeks following
transfection. Three days and seven days later a total of 196 cell
clones were picked from the dishes transfected with pIG35.55K and
seeded in separate wells of 96-well plates.
[0176] Cells remaining after colony picking of two 10 cm dishes of
the transfection with 1 .mu.g pIG35.55K DNA were trypsinized,
pooled and expanded to give pool PER55K(1.0) The same was done for
two dishes of the 1.5 .mu.g transfection. The PER55K(1.0) cell pool
was expanded and seeded in four T25 flasks at a density of
3.5.times.10.sup.6 cells/flask for transfection to test virus
generation. In addition, three T25 flasks with parental PER.C6
cells were seeded at the same density. pAdApt35.eGFP (an adapter
plasmid containing the green fluorescent protein as marker gene;
see Example 4) was digested with PacI to liberate the adenoviral
sequences from the plasmid backbone. pWE.Ad35.pIX-rITR (see,
Example 4) was digested with NotI to liberate the adenoviral
sequences from the cosmid backbone. Two flasks with PER.C6 cells
and two flasks with PER55K(1.0) cells were transfected with 2 .mu.g
digested pAdApt35.eGFP and 6 .mu.g digested pWE.Ad35.pIX-rITR each.
One flask of each cell line was transfected with 8 .mu.g
pAdApt35.LacZ to monitor transfection efficiency. The remaining
flask with PER55K(1.0) cells served as a negative control and was
treated as the others but did not receive the transfection mixture.
All transfections were performed with LipofectAmine
(Invitrogen/Life Techn.) according to manufacturers' instructions
using for each transfection a total of 8 .mu.g DNA and 40 .mu.l
LipofectAmine reagent. The transfection mixture was removed after 4
hours incubation and fresh culture medium was added. Transfections
were done the day after seeding of the cells and again two days
later cells in the T25 flasks were transferred to a T80 flask
except for the LacZ control transfections. These were stained with
X-gal solution after mild fixation. After five hours incubation
with staining solution, the percentage of blue cells was estimated
at approximately 90% in both flasks showing that transfection went
well for both cell lines. Four days following the passage to the
T80 flasks the transfected PER55K(1.0) cultures showed starting CPE
(cytopathogenic effect, indicative of virus replication) with
approximately 100 events/flask. The untransfected PER55K(1.0) cells
were grown confluent with no evidence of CPE. In the transfected
PER.C6 cultures only three CPE events were visible in the confluent
monolayer of cells. Again three days later, the transfected
PER55K(1.0) cultures showed full CPE, with all cells rounded and
detached in clumbs. In contrast, in the PER.C6 cultures the few
events of CPE had not progressed and cells were still in monolayer.
This confirms earlier observations that generation of E1-deleted
Ad35-based viruses on PER.C6 is very inefficient. Also the
untransfected PER55K(1.0) cultures showed, as expected, a confluent
monolayer with no CPE. The cells and medium in the PER55K(1.0)
flasks with full CPE were harvested and subjected to two
freeze/thaw cycles after which the cell debris was removed by
centrifugation at 3000 rpm for 10 minutes in a table centrifuge.
One of the resulting crude lysates was used to infect a fresh
culture of PER55K(1.0) cells in a T175 flask (1.5 ml/flask). Cells
and medium were harvested at full CPE four days later. This shows
that infectious virus had formed in the initial transfections. GFP
expression was confirmed by fluorescent microscopy of A549 cells
infected with the crude lysate. The crude lysate was then used to
analyze complementation of this E1-deleted Ad35.AdApt.eGFP virus in
the individual clones as described below.
[0177] The above-described clones that were picked from the
pIG35.55K transfected PER.C6 cells were expanded and were
functionally tested for the ability to sustain replication of
Ad35.AdApt.eGFP. Hereto, the clones were seeded at two densities in
six-well plates and one day later infected with 15 ml of the above
described crude lysate. CPE was monitored the day after. Of the 146
clones tested in this way 19 gave full CPE at day 2 or 3 and 68
gave full CPE at day 5 or 6. The remaining clones had only partial
CPE or showed a few non-progressing events. The latter were
indistinguishable from PER.C6 cells that were taken along as a
negative control.
[0178] Based on these results a selection of 24 clones was made
that were further screened for the ability to generate recombinant
E1-deleted viruses following transfection of the pAdApt35.GFP
adapter plasmid and the large pWE.Ad35.pIX-rITR cosmid clone.
Hereto, clones were plated in T25 flasks and transfected with 2
.mu.g of the adapter and 6 .mu.g of the backbone plasmid using
LipofectAmine as described above. Two days following the
transfection, cells were transferred to T80 flasks to prevent
overconfluency of the cultures. Of the 24 clones, five gave full
CPE three days after passage to T80 and another 13 clones gave
progressing to full CPE the day after. The remaining six clones
showed no CPE or only starting. In comparison: routine generation
of E1-deleted Ad5 vectors on PER.C6 cells generally results in full
CPE four to six days after transfer to T80 flasks.
[0179] This shows that the new clones efficiently complement
E1-deleted adenovirus vectors. One of the clones (clone #16)
described above was used to generate and produce multiple batches
of E1 and E1/E3-deleted Ad35 viruses containing different
transgenes. Hereto, virus in crude lysates resulting from
transfections as described above, but using different adapter
plasmids, were plaque purified on the new cell line. Single plaques
were tested for transgene activity and then amplified for medium
scale production in four to eight triple layer flasks (3.times.175
cm/flask). Cells were harvested at full CPE and the virus was
released and purified as routinely done for adenoviruses and
described in Example 1. The extraction step with freon to remove
cellular debris was, however, replaced by a centrifugation step.
Thus after incubation with DnaseI, the cell debris was
centrifugated in conical 50 ml tubes (Greiner) at 8000 rpm in a
table top centrifuge (Beckman Coulter Allegra 21R with fixed angle
rotor) for 30 minutes at 4.degree. C. This step is repeated in a
fresh 50 ml tube until the supernatant was clear (usually one
time). The amount of virus particles was determined by HPLC
(Shabram et al., 1997). Table IV presents the yields after
downstream processing of medium scale productions of E1- and
E1/E3-deleted Ad35 viruses on triple layer flasks with PER55K clone
#16 cells. The amount of purified virus particles is comparable
with the yields of Ad5-based vectors on PER.C6 cells.
[0180] We conclude that we have generated multiple cell lines that
efficiently complement fully E1-deleted Ad35-based vectors. Thus,
Ad35 E1B-55K expression in an Ad5 complementing cell line
facilitates replication of Ad35 vectors.
Example 10
New Complementing Cell Lines from Primary Cells
[0181] Example 8 described the generation of construct pIG535, a
hybrid Ad5E1A-Ad35 E1B expression plasmid. pCC536s and pIG536 are
also hybrid Ad5-Ad35 E1 constructs but with the E1A region, E1B
promoter and most of the E1B-19K gene derived from Ad5 and most of
the E1B-55K gene derived from Ad35. Constructs pCC536s and pIG536
differ only in the heterologous poly adenylation sequence that
terminates the E1B transcript: pIG536 has the HBV pA sequence and
pCC536s has a synthetic pA sequence (SpA). The SpA sequence
consists of the upstream sequence element (USE) of the human C2
complement gene (Moreira et al., 1995) and the synthetic pA
sequence (SPA) described by Levitt et al., 1989.
[0182] The synthetic polyA sequence is build up using the following
oligos: C2SPA-1: 5'-CCC TGC AGG GAC TTG ACT CAT GCT TGT TTC ACT TTC
ACA TGG AAT TTC CCA GTT ATG AAA TTA ATA AAG-3' (SEQ ID NO:37) and
C2SPA-2: 5'-GTC TAG ACA CAC AAA AAA CCA ACA CAC TAT TGC AAT GAA AAT
AAA TTT CCT TTA TTA ATT TCA TAA CTG-3' (SEQ ID NO:38).
Oligonucleotides were mixed at 10 .mu.M concentration in 1.times.
annealing buffer (10 mM Tris HCl pH 7.5, 100 mM NaCl, 1 mM EDTA)
and, using a PCR machine, the solution was heated to 94.degree. C.
for 5 minutes and then cooled down to 65.degree. C. at 0.5.degree.
C./second and after incubation at 65.degree. C. for 5 minutes
further cooled down to 20.degree. C. at 0.05.degree. C./second.
Subsequently, 10 .mu.l 2 mM dNTPs, 0.5 .mu.l 1 M MgCl2 and 3 .mu.l
Klenow fragment (New England Biolabs) was added to 87 .mu.l of the
annealed sample and the mixture was incubated at room temperature
for 30 minutes. One .mu.l of the annealed and Klenow treated sample
was then amplified using the following primers: C2for: 5'-CGG GAT
CCC CTG CAG GGA CTT GAC-3' (SEQ ID NO:39) and SPArev: 5'-TTG CGA
CTT AAG TCT AGA CAC ACA AAA AAC C-3' (SEQ ID NO:40) using Pwo DNA
polymerase (Roche) according to manufacturer's instructions but
with addition of DMSO (Sigma) to a final concentration of 3%. The
PCR program was set at 94.degree. C. for 2 minutes, followed by 30
cycles of (94.degree. C. for 30 seconds, 55.degree. C. for 30
seconds and 72.degree. C. for 20 seconds). Where in this document
PCR programs are described "means time in minutes" and "means time
in seconds." The amplified DNA was then purified using the QIAquick
PCR purification kit (Qiagen) and digested with XbaI and SbfI. The
digested product was then again purified with the PCR purification
kit to remove the small digested ends. Construct pIG270 was also
digested with XbaI and SbfI (isoschizomer of Sse8387I) and the
resulting 5.9 kb vector containing fragment was isolated from gel
using the GeneClean II kit (BIO 101, Inc). The treated vector and
PCR insert were then ligated to give pCC271 (FIG. 28). pCC271 thus
contains the PGK promoter, the Ad35 E1 region (nucl. 468 to and
including 3400 from Ad35 sequence in Example 3 and SEQ ID NO:44)
and the synthetic pA (SpA). The synthetic pA sequence was then also
cloned into the construct pIG535 as follows.
[0183] pIG535 was digested with EcoRI, PstI and ScaI (All enzymes
from New England Biolabs digested in NEB buffer 3) and the 3 kb
insert corresponding to chimeric Ad5-Ad35 E1 region was purified
using the GeneClean II kit (BIO 101, Inc.). Construct pCC271 was
digested with EcoRI and PstI and the 3 kb vector fragment
containing the SpA and PGK promoter was isolated as above. Both
isolated fragments were ligated and transformed into STBL-2
competent cells (Invitrogen/LifeTechnologies) to give pCC535s (FIG.
29). pCC535s contains the same Ad5-Ad35 E1 sequences as pIG535
however, a different pA sequence.
[0184] For the construction of pCC536s, a subclone was made with
the new hybrid E1B sequences. Hereto, Ad5 E1A/E1B21K sequences were
amplified using the primers 5AK: 5'-GAG CGA AGA AAC CCA TCT GAG-3'
(SEQ ID NO:32) and 2155R: 5'-GGT CCA GGC CGG CTC TCG G-3' (SEQ ID
NO:33) with pIG.E1A.E1B (see, Example 6 and FIG. 12) as template
DNA using Pwo DNA polymerase (Roche) according to manufacturers
instructions and in addition a final concentration of 3% DMSO. The
program was set at: 94.degree. C. for 2 minutes followed by 30
cycles of (94.degree. C. for 30 seconds, 58.degree. C. for 30
seconds and 72.degree. C. for 30 seconds) and ended with 68.degree.
C. for 8 minutes. This resulted in a 210 bp fragment corresponding
to nucl. 2022 to 2233 of the Ad5 sequence. A second PCR was
performed on pCC271 with primers 2155F: 5'-CCG AGA GCC GGC CTG GAC
C-3' (SEQ ID NO:41) and 35F10: 5'-GCT CTA GAC CTG CAG GTT AGT CAG
TTT CTT CTC CAC TG-3' (SEQ ID NO:21).
[0185] The same PCR program was used but now with an elongation
time of 90 seconds. The resulting 1.3 kb fragment corresponds to
nucl. 2112 to 3400 of the Ad35 sequence with an SbfI site at the 3'
end. Note that primers 2155F (SEQ ID NO:41) and 2155R (SEQ ID
NO:33) are fully complementary allowing assembly of the two
fragments as follows:
[0186] Both PCR fragments were purified from gel using the Qiagen
gel extraction kit. Aliquots of the purified samples were then
mixed in equimolar ratio and used as template for an assembly PCR
amplification with primers 5AK (SEQ ID NO:32) and 35F10 (SEQ ID
NO:21) with Pwo DNA polymerase as above using the program settings:
94.degree. C. for 2 minutes, and five cycles of (94.degree. C. for
30 seconds, 60.degree. C. for 30 seconds and 72.degree. C. for 2
minutes) followed by 25 cycles of (94.degree. C. for 30 seconds,
58.degree. C. for 30 seconds and 72.degree. C. for 90 seconds). The
resulting 1.5 kb fragment was purified from gel using the QIAquick
gel extraction kit (Qiagen), ligated to the pCR-Script/Amp cloning
vector (Stratagene) and transformed into DH5a competent cells
(Invitrogen/Life Technologies) resulting in pCR535E1B (FIG. 30).
This construct was checked by restriction analysis and sequencing
to confirm correct amplification of target sequences.
[0187] pCR535E1B was then digested with NotI and protruding ends
were made blunt with Klenow fragment. The DNA was then purified
using the QIAquick PCR purification kit (Qiagen) and eluted DNA was
digested with PstI. The 1.5 kb fragment containing the chimeric E1
sequences from the pCR535E1B vector was purified from gel using the
GeneClean II kit (BIO 101, Inc.). This fragment was ligated to
vector pCC535s digested with PvuII and PstI, and transformed into
STBL-2 competent cells (Invitrogen/Life Technologies) to give
pCC2155s (FIG. 31). To complete the pCC536s construct Ad5-E1
sequences were then cloned into the pCC2155s subclone. Hereto,
pIG.E1A.E1B was digested with EcoRI and KpnI and the 1.6 kb
fragment corresponding to Ad5 E1A and Ad5 E1B 21K (nucl. 459 to
2048 of the Ad5 sequence) was isolated from gel using the GeneClean
kit. pCC2155s was digested with EcoRI and KpnI and the vector
containing fragment was also gel purified. Ligation of both
isolated fragments and transformation into DH10B electrocompetent
cells (Invitrogen/Life Technologies) resulted in pCC536s (FIG. 32).
The hybrid E1B sequences are shown in FIG. 37 in more detail. FIG.
37A shows an alignment of protein sequences of E1B-21K in the
pCC536s construct with wild type (wt) Ad35 and Ad5 sequences. As
can be seen most of the E1B-21K protein in pCC536s is derived from
Ad5 except for the C-terminal six amino acids that are identical to
Ad35 E1B-21K. FIG. 37B shows the same alignment for the E1B-55K
proteins. In this case the N-terminal amino acids of pCC536s are
identical to Ad5 up to aa 65. The remainder is identical to Ad35
E1B-55K. Obviously, different hybrid E1B-55K constructs can be
designed using the general method outlined above without departing
from the invention.
[0188] Construct pIG536 was made by replacing a fragment with the
SpA in pCC536s with the corresponding fragment from pIG270 (Example
6, FIG. 14) containing the HBVpA. Hereto, pIG270 was digested with
BamHI and BglI and the 1.8 kb insert was isolated from gel using
the GeneClean II kit (BIO 101, Inc.). pCC536s was digested with the
same enzymes and the 4.8 kb vector containing fragment was purified
from gel as above. Ligation of both isolated fragments and
transformation into STBL-2 competent cells (Invitrogen/Life
Technologies) gave construct pIG536 (FIG. 33).
[0189] The generated E1 constructs were tested in primary baby rat
kidney (BRK) cells as described in Example 6. The results (Table V)
confirm earlier observations that Ad5-E1 genes more efficiently
transform primary BRK cells than Ad35 E1 genes. The chimeric
Ad5-Ad35 E1 expression constructs, pCC535s and pCC536s, produced
more transformed colonies than the full Ad35 E1 constructs, pIG270
and pCC271. Furthermore, the use of a synthetic poly adenylation
sequence in pCC535s resulted in slightly more foci compared to the
HBVpA variant pIG535.
[0190] Human embryonic retinoblast (HER) cells were isolated from
the eyes of aborted fetuses of 18 and 21 weeks of age. The eyes
were brought in a 6 cm dish with PBS and cleared from outside
tissue. An incision was made to reach the inner side and the gray
cell layer at the inner back of the eyes containing the
retinoblasts, was scraped off. This layer was transferred to a 14
ml tube in 2 ml of PBS and tissue was allowed to sediment after
which the PBS was removed. 2 ml trypsin (0.25%, no EDTA, GibcoBRL)
was added and incubated for 5 minutes at 37.degree. C. with
occasional swirling. Tissue pieces were allowed to sediment and 1
ml trypsin with cells was transferred to a new tube. To this tube 4
ml culture medium (DMEM with 10% FCS) was added and the tube was
stored on ice. The remaining tissue pieces in trypsin were brought
in a 6 cm dish and cut into smaller pieces. These were, after
addition of 2 ml fresh trypsin, again incubated in a 14 ml tube at
37.degree. C. with occasionally swirling. Then this mixture was
added to the first isolated cells in culture medium and the total
was centrifugated at 1000 rpm in a table top centrifuge.
Supernatant was removed and cells were resuspended in 10 ml of
culture medium. The isolated HER cells were plated in two 6 cm
dishes and incubated at 37.degree. C./10% CO.sub.2. Upon 90%
confluency cultures were split 1:3 and further incubated. This
procedure was repeated until enough dishes were obtained to be used
for transfection and further culturing. Transfections were
performed at different passage numbers using the CaPO.sub.4
cotransfection kit (Invitrogen/Life Technologies) according to the
manufacturer's instructions. For each dish (50 to 70% confluency)
20 .mu.g DNA was used. Initial transfections were performed with
pIG.E1A.E1B, an Ad5-E1 expression construct, and with pIG535, the
hybrid Ad5-E1A/Ad35-E1B expression construct. Two to three weeks
following transfection transformed foci became visible in the
pIG.E1A.E1B transfected dishes. On average, 15 to 20 foci/dish were
found in the dishes that were transfected with pIG.E1A.E1B. Over 30
clones were picked and transferred to 96-well plates. Upon
confluency cells were passaged to larger culture plates or flasks
and finally viable frozen in ampoules in liqN.sub.2 from a T175
flask. All picked clones were established in this way. Transformed
foci appeared much later in the dishes that were transfected with
pIG535, the first around five weeks following transfection. On
average, three to four clones were found per dish. A total of 46
clones were picked from seven weeks to three months after
transfections of which 14 were viable and could be passaged
multiple times. Of these, two clones (clone #45 and #75) were grown
up to a T175 flask and viable frozen in ampoules in liqN.sub.2.
[0191] Primary HER cells were also transfected with constructs
pCC535s and pCC536s. Transfection of pCC535s let to an average of
two clones/dish and a total of 50 clones were picked. Of these
picked clones two could be established. From the transfection with
pCCS36s, at least one clone could be established.
[0192] The above-described experiments show that primary HER cells
can be transformed with hybrid Ad5-Ad35 E1 sequences. The
efficiency of transformation was lower than obtained with the
complete Ad5 E1 region. We then tested whether the new cell lines
could complement recombinant Ad35-based E1-deleted vectors. Hereto,
the clone #45 that was obtained from the pIG535 transfection was
seeded in T25 flasks at a density of 7.times.10.sup.6 cells/flask
and infected with Ad35.AdApt.eGFP virus (see Example 9) at a
multiplicity of infection (moi) of 5 and 25 virus particles/cell.
Full CPE was seen at days 4 and 5 for the moi 25 and 5,
respectively. As a comparison parallel cultures of clone #45 cells
that were infected with Ad5.AdApt.eGFP viruses gave full CPE at
days 7 and 8 for moi 25 and 5, respectively. The initial infection
efficiency was comparable for Ad5 and Ad35 viruses, .about.80%
(moi=5) and .about.95% (moi=25) of the cells were infected with GFP
virus one day following infection as measured by fluorescence
microscopy. Cells from clone #75 were seeded in a six-well plate at
a density of 2.times.10.sup.6 cells/well and infected with
Ad35.AdApt.eGFP or Ad5.AdApt.eGFP at moi 5 (VP/cell). Again initial
infection efficiency was comparable for both viruses. Full CPE was
observed at day 4 in case of Ad35.AdApt.eGFP infection whereas
Ad5.AdApt.eGFP infected clone #75 cells gave full CPE on day 7. The
difference in replication efficiency on Ad35 complementing cells
between Ad35 and Ad5 recombinant vectors is even more clear when
virus is generated by plasmid transfection. This is exemplified by
the following transfection experiment. Clone #45 cells were seeded
in T25 flasks at a density of 3.5.times.10.sup.6 cells and
transfected three days later using LipofectAmine reagent
(Invitrogen/Life Technologies) according to manufacturers
instructions and described above. 2 .mu.g pAdApt35.eGFP adapter
plasmid digested with PacI was cotransfected with 6 .mu.g
pWE.Ad35.pIX-ITR or pWE.Ad35.pIX-rITR.DELTA.E3 backbone cosmid
digested with NotI. 2 .mu.g pAdApt.eGFP (Ad5 adapter plasmid,
described in WO 00/70071) digested with PacI was cotransfected with
6 .mu.g pWE.Ad5.AflII-rITRsp (Ad5 backbone plasmid, described in WO
00/70071) also digested with PacI. One T25 was not transfected and
served as a negative control. One day later transfection
efficiencies were monitored by fluorescent microscopy and estimated
at 10 to 15% in all eGFP transfections. Three days following
transfection cells were transferred to T80 flasks and further
incubated at 37.degree. C./10% CO.sub.2. Again three days later CPE
events were becoming visible in the cultures transfected with the
pAdApt35.eGFP and the pWE.Ad35pIX-rITR+ or -E3. The transfections
with the E3-deleted backbone contained more green fluorescent cells
and more CPE events. The transfection with Ad5 plasmids showed only
around 20% green fluorescent cells, of which most were dying, and
no CPE events. Two days later this difference had become bigger
since cultures transfected with the pAdApt35.eGFP and the
pWE.Ad35pIX-ITR.DELTA.E3 clearly showed 80% CPE and cultures
transfected with the pAdApt35.eGFP and the pWE.Ad35pIX-rITR
constructs showed progressing CPE events. The Ad5 transfected
culture did not show any progression. Table VI summarizes these
results.
[0193] We conclude that the new complementing cell lines described
above efficiently sustain replication of E1-deleted Ad35-based
viruses and that the generation and replication of E1-deleted
Ad5-based viruses is less efficient. Apparently, also Ad35-E1B55K
proteins do not form a functional complex with Ad5-E4Orf6 proteins.
Thus the serotype specificity for complementation is now also shown
for recombinant Ad5 vectors on Ad35 packaging cells.
Example 11
Generation of pWE.Ad.pIX-rITR.DELTA.E3
[0194] The early region-3 of human adenoviruses contains multiple
coding regions for proteins that interfere with the host immune
response to adenoviral infection. When adenoviral vectors are used
as vaccine carrier such interference is unwanted. Therefore, we
constructed an Ad35 backbone cosmid lacking the E3 region.
[0195] Hereto, construct pBr.Ad35.PRn (FIG. 34; described in
Example 13 in publication EP 1 054 064 A1) was digested with StuI
and MluI and the 17.3 kb vector fragment was purified from low
melting point (LMP) gel using agarase enzyme (Roche) according to
manufacturers instructions. Next, a PCR fragment was generated on
pBr.Ad35.PRn using primers: 35E3for: 5'-AAT GAC TAA TGC AGG TGC
GC-3' (SEQ ID NO:42) and 35E3rev: 5'-CGA CGC GTT GTA GTC GTT GAG
CTT CTA G-3' (SEQ ID NO:43). For the amplification Pwo DNA
polymerase (Roche) was used according to manufacturers instructions
and program set at: 94.degree. C. for 2 minutes, 30 cycles of
(94.degree. C. for 30 seconds, 58.degree. C. for 30 seconds and
72.degree. C. for 1 minute) and a final incubation at 68.degree. C.
for 8 minutes. The 833 bp PCR product was purified using the
QIAquick PCR purification kit (Qiagen) and digested with MluI and
StuI. The digested DNA was purified from gel using the QIAquick gel
extraction kit (Qiagen). Both isolated fragments were ligated and
transformed into DH5a competent cells (Invitrogen/Life
Technologies) to give pBr.Ad35.PRn.DELTA.E3 (FIG. 35). The plasmid
was checked by restriction analysis and sequencing of the PCR
amplified insert. The E3 deletion was then cloned into the
pWE.Ad35.pIX-rITR cosmid backbone. Hereto, pWE.Ad35.pIX-rITR (see
Example 4 and FIG. 7) was digested with PacI and the DNA was
purified by precipitation with isopropanol and washing with 70%
EtOH. Following resuspension in milliQ water, the DNA was digested
with SwaI and the 22.8 kb vector containing fragment was purified
from LMP gel using agarase enzyme as above. Construct
pBr.Ad35.PRn.DELTA.E3 was digested with PacI and SwaI in the same
manner and the 16.6 kb fragment was also isolated using agarase
enzyme. Both isolated fragments were ligated using 0.5 to 0.6 .mu.g
of each fragment. Ligated fragments were then packaged using
.lamda.-phage packaging extracts (Stratagene) according to the
manufacturer's instructions and mixed with STBL-2 cells. Bacteria
were plated on LB+Amp plates and resulting colonies were analyzed
for the presence of the correct construct. This gave construct
pWE.Ad35.pIX-rITR.DELTA.E3 (FIG. 36). The E3 deletion extends from
nucl. 27648 to 30320 of the Ad35 sequence (Example 3) and thus
spans a 2.6 kb region.
[0196] Cotransfection of NotI digested pWE.Ad35.pIX-rITR.DELTA.E3
and pIPsp-1 digested pAdApt35.eGFP onto PER55-clone #16 cells (see
Example 9) as described above gave rise to GFP expressing
Ad35-based viruses. Upon isolation of viral DNA from these viruses,
PCR amplification of the E3 region showed that the viruses were
deleted for 2.6 kb of E3 sequences as expected.
TABLE-US-00003 TABLE I Sero- Elution log.sub.10 VP/ type [NaCl] mM
VP/ml CCID50 CCID50 ratio 1 597 8.66 .times. 10.sup.10 5.00 .times.
10.sup.7 3.2 2 574 1.04 .times. 10.sup.12 .sup. 3.66 .times.
10.sup.11 0.4 3 131 1.19 .times. 10.sup.11 1.28 .times. 10.sup.7
4.0 4 260 4.84 .times. 10.sup.11 2.50 .times. 10.sup.8 3.3 5 533
5.40 .times. 10.sup.11 .sup. 1.12 .times. 10.sup.10 1.7 6 477 1.05
.times. 10.sup.12 .sup. 2.14 .times. 10.sup.10 1.7 7 328 1.68
.times. 10.sup.12 2.73 .times. 10.sup.9 2.4 9 379 4.99 .times.
10.sup.11 3.75 .times. 10.sup.7 4.1 10 387 8.32 .times. 10.sup.12
1.12 .times. 10.sup.9 3.9 12 305 3.64 .times. 10.sup.11 1.46
.times. 10.sup.7 4.4 13 231 4.37 .times. 10.sup.12 7.31 .times.
10.sup.8 3.8 15 443 5.33 .times. 10.sup.12 1.25 .times. 10.sup.9
3.6 16 312 1.75 .times. 10.sup.12 5.59 .times. 10.sup.8 3.5 17 478
1.39 .times. 10.sup.12 1.45 .times. 10.sup.9 3.0 19 430 8.44
.times. 10.sup.11 8.55 .times. 10.sup.7 4.0 20 156 1.41 .times.
10.sup.11 1.68 .times. 10.sup.7 3.9 21 437 3.21 .times. 10.sup.11
1.12 .times. 10.sup.8 3.5 22 365 1.43 .times. 10.sup.12 5.59
.times. 10.sup.7 3.4 23 132 2.33 .times. 10.sup.11 1.57 .times.
10.sup.7 4.2 24 405 5.12 .times. 10.sup.12 4.27 .times. 10.sup.8
4.1 25 405 7.24 .times. 10.sup.11 5.59 .times. 10.sup.7 4.1 26 356
1.13 .times. 10.sup.12 1.12 .times. 10.sup.8 4.0 27 342 2.00
.times. 10.sup.12 1.28 .times. 10.sup.8 4.2 28 347 2.77 .times.
10.sup.12 5.00 .times. 10.sup.7 4.7 29 386 2.78 .times. 10.sup.11
2.00 .times. 10.sup.7 4.1 30 409 1.33 .times. 10.sup.12 5.59
.times. 10.sup.8 3.4 31 303 8.48 .times. 10.sup.10 2.19 .times.
10.sup.7 3.6 33 302 1.02 .times. 10.sup.12 1.12 .times. 10.sup.7
5.0 34 425 1.08 .times. 10.sup.12 .sup. 1.63 .times. 10.sup.11 0.8
35 446 3.26 .times. 10.sup.12 .sup. 1.25 .times. 10.sup.11 1.4 36
325 9.26 .times. 10.sup.12 3.62 .times. 10.sup.9 3.4 37 257 5.86
.times. 10.sup.12 2.8 .times. 10.sup.9 3.3 38 337 3.61 .times.
10.sup.12 5.59 .times. 10.sup.7 4.8 39 241 3.34 .times. 10.sup.11
1.17 .times. 10.sup.7 4.5 42 370 1.95 .times. 10.sup.12 1.12
.times. 10.sup.8 4.2 43 284 2.42 .times. 10.sup.12 1.81 .times.
10.sup.8 4.1 44 295 8.45 .times. 10.sup.11 2.00 .times. 10.sup.7
4.6 45 283 5.20 .times. 10.sup.11 2.99 .times. 10.sup.7 4.2 46 282
9.73 .times. 10.sup.12 2.50 .times. 10.sup.8 4.6 47 271 5.69
.times. 10.sup.11 3.42 .times. 10.sup.7 4.2 48 264 1.68 .times.
10.sup.12 9.56 .times. 10.sup.8 3.3 49 332 2.20 .times. 10.sup.12
8.55 .times. 10.sup.7 4.4 50 459 7.38 .times. 10.sup.12 2.80
.times. 10.sup.9 3.4 51 450 8.41 .times. 10.sup.11 1.88 .times.
10.sup.8 3.7
[0197] Legend to Table I: All human adenoviruses used in the
neutralization experiments were produced on PER.C6 cells (Fallaux
et al., 1998) and purified on CsCl as described in Example 1. The
NaCl concentration at which the different serotypes eluted from the
HPLC column is shown. Virus particles/ml (VP/ml) were calculated
from an Ad5 standard. The titer in the experiment (CCID50) was
determined on PER.C6 cells as described in Example 1 by titrations
performed in parallel with the neutralization experiment. The
CCID50 is shown for the 44 viruses used in this study and reflects
the dilution of the virus needed to obtain CPE in 50% of the wells
after five days. The ratio of VP/CCID50 is depicted in log.sub.10
and is a measurement of the infectivity of the different batches on
PER.C6 cells.
TABLE-US-00004 TABLE II AdApt35.LacZ viruses escape neutralization
by human serum. Human serum dilution Virus no serum 10x 50x 250x
1250x 6250x AdApt5.LacZ 100% 0% 0% 1% 40% 80% moi: 5 VP/cell
AdApt35.LacZ 100% 100% 100% 100% 100% 100% 250 .mu.l crude
lysate
TABLE-US-00005 TABLE III The numbers of foci obtained with the
different E1 expression constructs in BRK transformation
experiments. Average # of foci/dish: Construct 1 .mu.gr 5 .mu.gr
Experiment 1 pIG.E1A.E1B nd 60 pIG.E1A.E1B nd 35 pRSVAd35E1 0 3
pIG.Ad35.E1 3 7 Experiment 2 pIG.E1A.E1B 37 nd pIG.Ad35.E1 nd 2
Experiment 3 pIG.E1A.E1B nd 140 pIG.Ad35.E1 nd 20 pIG270 nd 30
TABLE-US-00006 TABLE IV Yields of E1- and E1/E3-deleted Ad35
viruses on clone #16 cells produced on triple layer flasks. Scale
Total # of Virus Virus (T175III flasks) Particles after DSP VP/cell
Ad35.AdApt.eGFP 4 7.5 .times. 10.sup.11 2500
Ad35..DELTA.E3.AdApt.empty 8 2 .times. 10.sup.12 3300
Ad35..DELTA.E3.AdApt.LacZ 8 3.8 .times. 10.sup.11 600
Ad35..DELTA.E3.AdApt.MV-F 4 8.8 .times. 10.sup.11 2900
Ad35..DELTA.E3.AdApt.MV-H 8 2.6 .times. 10.sup.12 4250
TABLE-US-00007 TABLE V Transformation efficiencies on BRK cells
with different Ad-E1 expression constructs. Construct Transfected
DNA (.mu.g) # foci per dish Experiment 1 pIG.E1A.E1B 5 44 pIG270 5
0 pCC271 5 0 pIG535 5 1 pCC535s 5 2.5 Experiment 2 pIG.E1A.E1B 4 15
pCC271 4 0 pCC535s 4 3 pCC536s 4 3
TABLE-US-00008 TABLE VI Generation of recombinant Ad35 viruses on
the new established complementing cell line clone #45. Transfected
constructs Day 1 Day 3 Day 6 Day 8 GFP Expression x pAdApt35.eGFP +
pWE.Ad35.pIX-rITR 15% 20% 30% 50% pAdApt35.eGFP +
pWE.Ad35.pIX-rITR.DELTA.E3 10% 25% 40-50% 100% pAdApt5.eGFP +
pWE.Ad5.AflII-rITR 15% 25% 20% 20% untransfected 0% 0% 0% 0% CPE
events x pAdApt35.eGFP + pWE.Ad35.pIX-rITR 0 0 1 several
pAdApt35.eGFP + pWE.Ad35.pIX-rITR.DELTA.E3 0 0 several 80%
pAdApt5.eGFP + pWE.Ad5.AflII-rITR 0 0 0 0 untransfected 0 0 0 0
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transformation: Altered organization of intermediate filaments in
transformed cells that express the 19-kilodalton protein. Mol.
Cell. Biol. 10, p 120-130. [0223] White, E. (1995). Regulation of
p53-dependent apoptosis by E1A and E1B. In: The molecular
repertoire of adenoviruses III. Eds. Doerfler, W. and Bohm, P.
Springer-Verlag Berlin Heidelberg 1995, p33-58. [0224] White, E.
(1996). Life, death, and the pursuit of apoptosis. Genes Dev. 10
(1), p1-15. [0225] Yew, P. R., Kao, C. C. and Berk, A. J. (1990).
Dissection of functional domains in the adenovirus 2 early region
1B-55K polypeptide by suppressor-linker insertional mutagenesis.
Virology 179, p 795-805. [0226] Yew, P. R. and Berk, A. J. (1992).
Inhibition of p53 transactivation required for transformation by
adenovirus early region 1B protein. Nature 357, p82-85. [0227]
Simonsen, C. C. and Levinson, A. D. (1983). Analysis of processing
and polyadenylation signals of the hepatitis B virus surface
antigen gene by using simian virus 40-hepatitis B virus chimeric
plasmids. Mol. and Cell. Biol. 3 (12), p2250-2258. [0228] Zantema,
A., Fransen, J. A., Davis, O. A., Ramaekers, F. C., Vooijs, G. P.,
DeLeys, B. and van der Eb, A. J. (1985). Localization of the E1B
proteins of adenovirus 5 in transformed cells, as revealed by
interaction with monoclonal antibodies. Virology 142, p44-58.
[0229] Zantema, A. and van der Eb, A. J. (1995). Modulation of gene
expression by adenovirus transformation. In: The molecular
repertoire of adenoviruses III. Eds. Doerfler, W. and Bohm, P.
Springer-Verlag Berlin Heidelberg 1995, p 1-23.
Sequence CWU 1
1
50114DNAadenoviridaemisc_feature(1)..(14)/note="5'end" 1ccaataatat
acct 14221DNAadenoviridaemisc_feature(1)..(21)/note="3'end"
2aggtatatta ttgatgatgg g
21318DNAadenoviridaemisc_feature(1)..(18)/note="Terminal sequence"
3catcatcaat aatatacc 18447DNAArtificial SequenceDescription of
Artificial Sequence oligo ExSalPacF 4tcgatggcaa acagctatta
tgggtattat gggttcgaat taattaa 47547DNAArtificial
SequenceDescription of Artificial Sequence oligo ExSalPacR
5tcgattaatt aattcgaacc cataataccc ataatagctg tttgcca
47642DNAArtificial SequenceDescription of Artificial Sequence
primer PCLIPMSF 6ccccaattgg tcgaccatca tcaataatat accttatttt gg
42722DNAArtificial SequenceDescription of Artificial Sequence
primer pCLIPBSRGI 7gcgaaaattg tcacttcctg tg 22837DNAArtificial
SequenceDescription of Artificial Sequence oligo Ecolinker+
8aattcggcgc gccgtcgacg atatcgatag cggccgc 37937DNAArtificial
SequenceDescription of Artificial Sequence oligo Ecolinker-
9aattgcggcc gctatcgata tcgtcgacgg cgcgccg 371049DNAArtificial
SequenceDescription of Artificial Sequence oligonucleotide HindXba+
10agctctagag gatccgttaa cgctagcgaa ttcaccggta ccaagctta
491149DNAArtificial SequenceDescription of Artificial Sequence
oligonucleotide HindXba- 11ctagtaagct tggtaccggt gaattcgcta
gcgttaacgg atcctctag 491244DNAArtificial SequenceDescription of
Artificial Sequence primer 35F1 12cggaattctt aattaatcga catcatcaat
aatatacctt atag 441333DNAArtificial SequenceDescription of
Artificial Sequence primer 35R2 13ggtggtccta ggctgacacc tacgtaaaaa
cag 331430DNAArtificial SequenceDescription of Artificial Sequence
primer 335F3 14tggtggagat ctggtgagta ttgggaaaac 301537DNAArtificial
SequenceDescription of Artificial Sequence primer 435R4
15cggaattctt aattaaggga aatgcaaatc tgtgagg 371634DNAArtificial
SequenceDescription of Artificial Sequence primer 535F5
16cggaattcgc ggccgcggtg agtattggga aaac 341722DNAArtificial
SequenceDescription of Artificial Sequence primer 635R6
17cgccagatcg tctacagaac ag 221823DNAArtificial SequenceDescription
of Artificial Sequence primer 735F7 18gaatgctggc ttcagttgta atc
231942DNAArtificial SequenceDescription of Artificial Sequence
primer 835R8 19cggaattcgc ggccgcattt aaatcatcat caataatata cc
422033DNAArtificial SequenceDescription of Artificial Sequence
primer 135F11 20ggggtaccga attctcgcta gggtatttat acc
332138DNAArtificial SequenceDescription of Artificial Sequence
primer 235F10 21gctctagacc tgcaggttag tcagtttctt ctccactg
382227DNAArtificial SequenceDescription of Artificial Sequence
primer 3HBV-F 22ggctctagag atccttcgcg ggacgtc 272326DNAArtificial
SequenceDescription of Artificial Sequence primer 4HBV-R
23ggcgaattca ctgccttcca ccaagc 262417DNAArtificial
SequenceDescription of Artificial Sequence oligonucleotide 1BB1
24gtgcctaggc cacgggg 172513DNAArtificial SequenceDescription of
Artificial Sequence oligonucleotide 2BB2 25gtggcctagg cac
132620DNAArtificial SequenceDescription of Artificial Sequence
primer 3270F 26cacctctgcc taatcatctc 202727DNAArtificial
SequenceDescription of Artificial Sequence primer 4270R
27gctctagaaa ttccactgcc ttccacc 272825DNAArtificial
SequenceDescription of Artificial Sequence primer 135D21/535D21
28ttagatccat ggatcccgca gactc 252918DNAArtificial
SequenceDescription of Artificial Sequence primer 235B3/635B3
29cctcagcccc atttccag 183020DNAArtificial SequenceDescription of
Artificial Sequence primer 15E1A-F 30gagacgcccg acatcacctg
203126DNAArtificial SequenceDescription of Artificial Sequence
primer 25E1B-R 31caagcctcca tggggtcaga tgtaac 263221DNAArtificial
SequenceDescription of Artificial Sequence primer 45AK/5AK
32gagcgaagaa acccatctga g 213319DNAArtificial SequenceDescription
of Artificial Sequence primer 52155R/2155R 33ggtccaggcc ggctctcgg
193418DNAArtificial SequenceDescription of Artificial Sequence
primer 62155F 34ccgagagccg gcctggac 183538DNAArtificial
SequenceDescription of Artificial Sequence primer 735F10/35F10
35gctctagacc tgcaggttag tcagtttctt ctccactg 383643DNAArtificial
SequenceDescription of Artificial Sequence primer Bsp-R
36gctctagacc tgcagggtag caacaattcc ggatatttac aag
433769DNAArtificial SequenceDescription of Artificial Sequence
oligonucleotide C2SPA-1 37ccctgcaggg acttgactca tgcttgtttc
actttcacat ggaatttccc agttatgaaa 60ttaataaag 693869DNAArtificial
SequenceDescription of Artificial Sequence oligonucleotide C2SPA-2
38gtctagacac acaaaaaacc aacacactat tgcaatgaaa ataaatttcc tttattaatt
60tcataactg 693924DNAArtificial SequenceDescription of Artificial
Sequence primer C2for 39cgggatcccc tgcagggact tgac
244031DNAArtificial SequenceDescription of Artificial Sequence
primer SPArev 40ttgcgactta agtctagaca cacaaaaaac c
314119DNAArtificial SequenceDescription of Artificial Sequence
primer 2155F 41ccgagagccg gcctggacc 194220DNAArtificial
SequenceDescription of Artificial Sequence primer 35E3for
42aatgactaat gcaggtgcgc 204328DNAArtificial SequenceDescription of
Artificial Sequence primer 35E3rev 43cgacgcgttg tagtcgttga gcttctag
284434794DNAadenoviridaemisc_feature(1)..(34794)/note="Nucleic acid
sequence of Ad 35" 44catcatcaat aatatacctt atagatggaa tggtgccaat
atgtaaatga ggtgatttta 60aaaagtgtgg gccgtgtggt gattggctgt ggggttaacg
gttaaaaggg gcggcgcggc 120cgtgggaaaa tgacgtttta tgggggtgga
gtttttttgc aagttgtcgc gggaaatgtt 180acgcataaaa aggcttcttt
tctcacggaa ctacttagtt ttcccacggt atttaacagg 240aaatgaggta
gttttgaccg gatgcaagtg aaaattgctg attttcgcgc gaaaactgaa
300tgaggaagtg tttttctgaa taatgtggta tttatggcag ggtggagtat
ttgttcaggg 360ccaggtagac tttgacccat tacgtggagg tttcgattac
cgtgtttttt acctgaattt 420ccgcgtaccg tgtcaaagtc ttctgttttt
acgtaggtgt cagctgatcg ctagggtatt 480tatacctcag ggtttgtgtc
aagaggccac tcttgagtgc cagcgagaag agttttctcc 540tctgcgccgg
cagtttaata ataaaaaaat gagagatttg cgatttctgc ctcaggaaat
600aatctctgct gagactggaa atgaaatatt ggagcttgtg gtgcacgccc
tgatgggaga 660cgatccggag ccacctgtgc agctttttga gcctcctacg
cttcaggaac tgtatgattt 720agaggtagag ggatcggagg attctaatga
ggaagctgtg aatggctttt ttaccgattc 780tatgctttta gctgctaatg
aaggattaga attagatccg cctttggaca ctttcaatac 840tccaggggtg
attgtggaaa gcggtacagg tgtaagaaaa ttacctgatt tgagttccgt
900ggactgtgat ttgcactgct atgaagacgg gtttcctccg agtgatgagg
aggaccatga 960aaaggagcag tccatgcaga ctgcagcggg tgagggagtg
aaggctgcca atgttggttt 1020tcagttggat tgcccggagc ttcctggaca
tggctgtaag tcttgtgaat ttcacaggaa 1080aaatactgga gtaaaggaac
tgttatgttc gctttgttat atgagaacgc actgccactt 1140tatttacagt
aagtgtgttt aagttaaaat ttaaaggaat atgctgtttt tcacatgtat
1200attgagtgtg agttttgtgc ttcttattat aggtcctgtg tctgatgctg
atgaatcacc 1260atctcctgat tctactacct cacctcctga tattcaagca
cctgttcctg tggacgtgcg 1320caagcccatt cctgtgaagc ttaagcctgg
gaaacgtcca gcagtggaga aacttgagga 1380cttgttacag ggtggggacg
gacctttgga cttgagtaca cggaaacgtc caagacaata 1440agtgttccat
atccgtgttt acttaaggtg acgtcaatat ttgtgtgaga gtgcaatgta
1500ataaaaatat gttaactgtt cactggtttt tattgctttt tgggcgggga
ctcaggtata 1560taagtagaag cagacctgtg tggttagctc ataggagctg
gctttcatcc atggaggttt 1620gggccatttt ggaagacctt aggaagacta
ggcaactgtt agagagcgct tcggacggag 1680tctccggttt ttggagattc
tggttcgcta gtgaattagc tagggtagtt tttaggataa 1740aacaggacta
taaacaagaa tttgaaaagt tgttggtaga ttgcccagga ctttttgaag
1800ctcttaattt gggccatcag gttcacttta aagaaaaagt tttatcagtt
ttagactttt 1860caaccccagg tagaactgct gctgctgtgg cttttcttac
ttttatatta gataaatgga 1920tcccgcagac tcatttcagc aggggatacg
ttttggattt catagccaca gcattgtgga 1980gaacatggaa ggttcgcaag
atgaggacaa tcttaggtta ctggccagtg cagcctttgg 2040gtgtagcggg
aatcctgagg catccaccgg tcatgccagc ggttctggag gaggaacagc
2100aagaggacaa cccgagagcc ggcctggacc ctccagtgga ggaggcggag
tagctgactt 2160gtctcctgaa ctgcaacggg tgcttactgg atctacgtcc
actggacggg ataggggcgt 2220taagagggag agggcatcca gtggtactga
tgctagatct gagttggctt taagtttaat 2280gagtcgcaga cgtcctgaaa
ccatttggtg gcatgaggtt cagaaagagg gaagggatga 2340agtttctgta
ttgcaggaga aatattcact ggaacaggtg aaaacatgtt ggttggagcc
2400agaggatgat tgggcggtgg ccattaaaaa ttatgccaag atagctttga
ggcctgataa 2460acagtataag atcagtagac ggattaatat ccggaatgct
tgttacatat ctggaaatgg 2520ggctgaggtg gtaatagata ctcaagacaa
gacagttatt agatgctgca tgatggatat 2580gtggcctgga gtagtcggta
tggaagcagt cacttttgta aatgttaagt ttaggggaga 2640tggttataat
ggaatagtgt ttatggccaa taccaaactt atattgcatg gttgtagctt
2700ttttggtttc aacaatacct gtgtagatgc ctggggacag gttagtgtac
gggggtgtag 2760tttctatgcg tgttggattg ccacagctgg cagaaccaag
agtcaattgt ctctgaagaa 2820atgcatattc caaagatgta acctgggcat
tctgaatgaa ggcgaagcaa gggtccgtca 2880ctgcgcttct acagatactg
gatgttttat tttaattaag ggaaatgcca gcgtaaagca 2940taacatgatt
tgtggtgctt ccgatgagag gccttatcaa atgctcactt gtgctggtgg
3000gcattgtaat atgctggcta ctgtgcatat tgtttcccat caacgcaaaa
aatggcctgt 3060ttttgatcac aatgtgttga ccaagtgcac catgcatgca
ggtgggcgta gaggaatgtt 3120tatgccttac cagtgtaaca tgaatcatgt
gaaagtgttg ttggaaccag atgccttttc 3180cagaatgagc ctaacaggaa
tctttgacat gaacacgcaa atctggaaga tcctgaggta 3240tgatgatacg
agatcgaggg tgcgcgcatg cgaatgcgga ggcaagcatg ccaggttcca
3300gccggtgtgt gtagatgtga ccgaagatct cagaccggat catttggtta
ttgcccgcac 3360tggagcagag ttcggatcca gtggagaaga aactgactaa
ggtgagtatt gggaaaactt 3420tggggtggga ttttcagatg gacagattga
gtaaaaattt gttttttctg tcttgcagct 3480gacatgagtg gaaatgcttc
ttttaagggg ggagtcttca gcccttatct gacagggcgt 3540ctcccatcct
gggcaggagt tcgtcagaat gttatgggat ctactgtgga tggaagaccc
3600gttcaacccg ccaattcttc aacgctgacc tatgctactt taagttcttc
acctttggac 3660gcagctgcag ccgctgccgc cgcctctgtc gccgctaaca
ctgtgcttgg aatgggttac 3720tatggaagca tcgtggctaa ttccacttcc
tctaataacc cttctacact gactcaggac 3780aagttacttg tccttttggc
ccagctggag gctttgaccc aacgtctggg tgaactttct 3840cagcaggtgg
ccgagttgcg agtacaaact gagtctgctg tcggcacggc aaagtctaaa
3900taaaaaaaat tccagaatca atgaataaat aaacgagctt gttgttgatt
taaaatcaag 3960tgtttttatt tcatttttcg cgcacggtat gccctggacc
accgatctcg atcattgaga 4020actcggtgga ttttttccag aatcctatag
aggtgggatt gaatgtttag atacatgggc 4080attaggccgt ctttggggtg
gagatagctc cattgaaggg attcatgctc cggggtagtg 4140ttgtaaatca
cccagtcata acaaggtcgc agtgcatggt gttgcacaat atcttttaga
4200agtaggctga ttgccacaga taagcccttg gtgtaggtgt ttacaaaccg
gttgagctgg 4260gaggggtgca ttcgaggtga aattatgtgc attttggatt
ggatttttaa gttggcaata 4320ttgccgccaa gatcccgtct tgggttcatg
ttatgaagga ctaccaagac ggtgtatccg 4380gtacatttag gaaatttatc
gtgcagcttg gatggaaaag cgtggaaaaa tttggagaca 4440cccttgtgtc
ctccgagatt ttccatgcac tcatccatga taatagcaat ggggccgtgg
4500gcagcggcgc gggcaaacac gttccgtggg tctgacacat catagttatg
ttcctgagtt 4560aaatcatcat aagccatttt aatgaatttg gggcggagcg
taccagattg gggtatgaat 4620gttccttcgg gccccggagc atagttcccc
tcacagattt gcatttccca agctttcagt 4680tctgagggtg gaatcatgtc
cacctggggg gctatgaaga acaccgtttc gggggcgggg 4740gtgattagtt
gggatgatag caagtttctg agcaattgag atttgccaca tccggtgggg
4800ccataaataa ttccgattac aggttgcagg tggtagttta gggaacggca
actgccgtct 4860tctcgaagca agggggccac ctcgttcatc atttccctta
catgcatatt ttcccgcacc 4920aaatccatta ggaggcgctc tcctcctagt
gatagaagtt cttgtagtga ggaaaagttt 4980ttcagcggtt ttagaccgtc
agccatgggc attttggaaa gagtttgctg caaaagttct 5040agtctgttcc
acagttcagt gatgtgttct atggcatctc gatccagcag acctcctcgt
5100ttcgcgggtt tggacggctc ctggagtagg gtatgagacg atgggcgtcc
agcgctgcca 5160gggttcggtc cttccagggt ctcagtgttc gagtcagggt
tgtttccgtc acagtgaagg 5220ggtgtgcgcc tgcttgggcg cttgccaggg
tgcgcttcag actcattctg ctggtggaga 5280acttctgtcg cttggcgccc
tgtatgtcgg ccaagtagca gtttaccatg agttcgtagt 5340tgagcgcctc
ggctgcgtgg cctttggcgc ggagcttacc tttggaagtt ttcttgcata
5400ccgggcagta taggcatttc agcgcataca gcttgggcgc aaggaaaatg
gattctgggg 5460agtatgcatc cgcgccgcag gaggcgcaaa cagtttcaca
ttccaccagc caggttaaat 5520ccggttcatt ggggtcaaaa acaagttttc
cgccatattt tttgatgcgt ttcttacctt 5580tggtctccat aagttcgtgt
cctcgttgag tgacaaacag gctgtccgta tctccgtaga 5640ctgattttac
aggcctcttc tccagtggag tgcctcggtc ttcttcgtac aggaactctg
5700accactctga tacaaaggcg cgcgtccagg ccagcacaaa ggaggctatg
tgggaggggt 5760agcgatcgtt gtcaaccagg gggtccacct tttccaaagt
atgcaaacac atgtcaccct 5820cttcaacatc caggaatgtg attggcttgt
aggtgtattt cacgtgacct ggggtccccg 5880ctgggggggt ataaaagggg
gcggttcttt gctcttcctc actgtcttcc ggatcgctgt 5940ccaggaacgt
cagctgttgg ggtaggtatt ccctctcgaa ggcgggcatg acctctgcac
6000tcaggttgtc agtttctaag aacgaggagg atttgatatt gacagtgccg
gttgagatgc 6060ctttcatgag gttttcgtcc atttggtcag aaaacacaat
ttttttattg tcaagtttgg 6120tggcaaatga tccatacagg gcgttggata
aaagtttggc aatggatcgc atggtttggt 6180tcttttcctt gtccgcgcgc
tctttggcgg cgatgttgag ttggacatac tcgcgtgcca 6240ggcacttcca
ttcggggaag atagttgtta attcatctgg cacgattctc acttgccacc
6300ctcgattatg caaggtaatt aaatccacac tggtggccac ctcgcctcga
aggggttcat 6360tggtccaaca gagcctacct cctttcctag aacagaaagg
gggaagtggg tctagcataa 6420gttcatcggg agggtctgca tccatggtaa
agattcccgg aagtaaatcc ttatcaaaat 6480agctgatggg agtggggtca
tctaaggcca tttgccattc tcgagctgcc agtgcgcgct 6540catatgggtt
aaggggactg ccccagggca tgggatgggt gagagcagag gcatacatgc
6600cacagatgtc atagacgtag atgggatcct caaagatgcc tatgtaggtt
ggatagcatc 6660gcccccctct gatacttgct cgcacatagt catatagttc
atgtgatggc gctagcagcc 6720ccggacccaa gttggtgcga ttgggttttt
ctgttctgta gacgatctgg cgaaagatgg 6780cgtgagaatt ggaagagatg
gtgggtcttt gaaaaatgtt gaaatgggca tgaggtagac 6840ctacagagtc
tctgacaaag tgggcataag attcttgaag cttggttacc agttcggcgg
6900tgacaagtac gtctagggcg cagtagtcaa gtgtttcttg aatgatgtca
taacctggtt 6960ggtttttctt ttcccacagt tcgcggttga gaaggtattc
ttcgcgatcc ttccagtact 7020cttctagcgg aaacccgtct ttgtctgcac
ggtaagatcc tagcatgtag aactgattaa 7080ctgccttgta agggcagcag
cccttctcta cgggtagaga gtatgcttga gcagcttttc 7140gtagcgaagc
gtgagtaagg gcaaaggtgt ctctgaccat gactttgaga aattggtatt
7200tgaagtccat gtcgtcacag gctccctgtt cccagagttg gaagtctacc
cgtttcttgt 7260aggcggggtt gggcaaagcg aaagtaacat cattgaagag
aatcttaccg gctctgggca 7320taaaattgcg agtgatgcgg aaaggctgtg
gtacttccgc tcgattgttg atcacctggg 7380cagctaggac gatttcgtcg
aaaccgttga tgttgtgtcc tacgatgtat aattctatga 7440aacgcggcgt
gcctctgacg tgaggtagct tactgagctc atcaaaggtt aggtctgtgg
7500ggtcagataa ggcgtagtgt tcgagagccc attcgtgcag gtgaggattt
gcatgtagga 7560atgatgacca aagatctacc gccagtgctg tttgtaactg
gtcccgatac tgacgaaaat 7620gccggccaat tgccattttt tctggagtga
cacagtagaa ggttctgggg tcttgttgcc 7680atcgatccca cttgagttta
atggctagat cgtgggccat gttgacgaga cgctcttctc 7740ctgagagttt
catgaccagc atgaaaggaa ctagttgttt gccaaaggat cccatccagg
7800tgtaagtttc cacatcgtag gtcaggaaga gtctttctgt gcgaggatga
gagccgatcg 7860ggaagaactg gatttcctgc caccagttgg aggattggct
gttgatgtga tggaagtaga 7920agtttctgcg gcgcgccgag cattcgtgtt
tgtgcttgta cagacggccg cagtagtcgc 7980agcgttgcac gggttgtatc
tcgtgaatga gctgtacctg gcttcccttg acgagaaatt 8040tcagtgggaa
gccgaggcct ggcgattgta tctcgtgctc ttctatattc gctgtatcgg
8100cctgttcatc ttctgtttcg atggtggtca tgctgacgag cccccgcggg
aggcaagtcc 8160agacctcggc gcgggagggg cggagctgaa ggacgagagc
gcgcaggctg gagctgtcca 8220gagtcctgag acgctgcgga ctcaggttag
taggtaggga cagaagatta acttgcatga 8280tcttttccag ggcgtgcggg
aggttcagat ggtacttgat ttccacaggt tcgtttgtag 8340agacgtcaat
ggcttgcagg gttccgtgtc ctttgggcgc cactaccgta cctttgtttt
8400ttcttttgat cggtggtggc tctcttgctt cttgcatgct cagaagcggt
gacggggacg 8460cgcgccgggc ggcagcggtt gttccggacc cgggggcatg
gctggtagtg gcacgtcggc 8520gccgcgcacg ggcaggttct ggtattgcgc
tctgagaaga cttgcgtgcg ccaccacgcg 8580tcgattgacg tcttgtatct
gacgtctctg ggtgaaagct accggccccg tgagcttgaa 8640cctgaaagag
agttcaacag aatcaatttc ggtatcgtta acggcagctt gtctcagtat
8700ttcttgtacg tcaccagagt tgtcctggta ggcgatctcc gccatgaact
gctcgatttc 8760ttcctcctga agatctccgc gacccgctct ttcgacggtg
gccgcgaggt cattggagat 8820acggcccatg agttgggaga atgcattcat
gcccgcctcg ttccagacgc ggctgtaaac 8880cacggccccc tcggagtctc
ttgcgcgcat caccacctga gcgaggttaa gctccacgtg 8940tctggtgaag
accgcatagt tgcataggcg ctgaaaaagg tagttgagtg tggtggcaat
9000gtgttcggcg acgaagaaat acatgatcca tcgtctcagc ggcatttcgc
taacatcgcc 9060cagagcttcc aagcgctcca tggcctcgta gaagtccacg
gcaaaattaa aaaactggga 9120gtttcgcgcg gacacggtca attcctcctc
gagaagacgg
atgagttcgg ctatggtggc 9180ccgtacttcg cgttcgaagg ctcccgggat
ctcttcttcc tcttctatct cttcttccac 9240taacatctct tcttcgtctt
caggcggggg cggagggggc acgcggcgac gtcgacggcg 9300cacgggcaaa
cggtcgatga atcgttcaat gacctctccg cggcggcggc gcatggtttc
9360agtgacggcg cggccgttct cgcgcggtcg cagagtaaaa acaccgccgc
gcatctcctt 9420aaagtggtga ctgggaggtt ctccgtttgg gagggagagg
gcgctgatta tacattttat 9480taattggccc gtagggactg cgcgcagaga
tctgatcgtg tcaagatcca cgggatctga 9540aaacctttcg acgaaagcgt
ctaaccagtc acagtcacaa ggtaggctga gtacggcttc 9600ttgtgggcgg
gggtggttat gtgttcggtc tgggtcttct gtttcttctt catctcggga
9660aggtgagacg atgctgctgg tgatgaaatt aaagtaggca gttctaagac
ggcggatggt 9720ggcgaggagc accaggtctt tgggtccggc ttgctggata
cgcaggcgat tggccattcc 9780ccaagcatta tcctgacatc tagcaagatc
tttgtagtag tcttgcatga gccgttctac 9840gggcacttct tcctcacccg
ttctgccatg catacgtgtg agtccaaatc cgcgcattgg 9900ttgtaccagt
gccaagtcag ctacgactct ttcggcgagg atggcttgct gtacttgggt
9960aagggtggct tgaaagtcat caaaatccac aaagcggtgg taagcccctg
tattaatggt 10020gtaagcacag ttggccatga ctgaccagtt aactgtctgg
tgaccagggc gcacgagctc 10080ggtgtattta aggcgcgaat aggcgcgggt
gtcaaagatg taatcgttgc aggtgcgcac 10140cagatactgg taccctataa
gaaaatgcgg cggtggttgg cggtagagag gccatcgttc 10200tgtagctgga
gcgccagggg cgaggtcttc caacataagg cggtgatagc cgtagatgta
10260cctggacatc caggtgattc ctgcggcggt agtagaagcc cgaggaaact
cgcgtacgcg 10320gttccaaatg ttgcgtagcg gcatgaagta gttcattgta
ggcacggttt gaccagtgag 10380gcgcgcgcag tcattgatgc tctatagaca
cggagaaaat gaaagcgttc agcgactcga 10440ctccgtagcc tggaggaacg
tgaacgggtt gggtcgcggt gtaccccggt tcgagacttg 10500tactcgagcc
ggccggagcc gcggctaacg tggtattggc actcccgtct cgacccagcc
10560tacaaaaatc caggatacgg aatcgagtcg ttttgctggt ttccgaatgg
cagggaagtg 10620agtcctattt tttttttttt tttgccgctc agatgcatcc
cgtgctgcga cagatgcgcc 10680cccaacaaca gcccccctcg cagcagcagc
agcagcaacc acaaaaggct gtccctgcaa 10740ctactgcaac tgccgccgtg
agcggtgcgg gacagcccgc ctatgatctg gacttggaag 10800agggcgaagg
actggcacgt ctaggtgcgc cttcgcccga gcggcatccg cgagttcaac
10860tgaaaaaaga ttctcgcgag gcgtatgtgc cccaacagaa cctatttaga
gacagaagcg 10920gcgaggagcc ggaggagatg cgagcttccc gctttaacgc
gggtcgtgag ctgcgtcacg 10980gtttggaccg aagacgagtg ttgcgagacg
aggatttcga agttgatgaa gtgacaggga 11040tcagtcctgc cagggcacac
gtggctgcag ccaaccttgt atcggcttac gagcagacag 11100taaaggaaga
gcgtaacttc caaaagtctt ttaataatca tgtgcgaacc ctgattgccc
11160gcgaagaagt tacccttggt ttgatgcatt tgtgggattt gatggaagct
atcattcaga 11220accctactag caaacctctg accgcccagc tgtttctggt
ggtgcaacac agcagagaca 11280atgaggcttt cagagaggcg ctgctgaaca
tcaccgaacc cgaggggaga tggttgtatg 11340atcttatcaa cattctacag
agtatcatag tgcaggagcg gagcctgggc ctggccgaga 11400aggtagctgc
catcaattac tcggttttga gcttgggaaa atattacgct cgcaaaatct
11460acaagactcc atacgttccc atagacaagg aggtgaagat agatgggttc
tacatgcgca 11520tgacgctcaa ggtcttgacc ctgagcgatg atcttggggt
gtatcgcaat gacagaatgc 11580atcgcgcggt tagcgccagc aggaggcgcg
agttaagcga cagggaactg atgcacagtt 11640tgcaaagagc tctgactgga
gctggaaccg agggtgagaa ttacttcgac atgggagctg 11700acttgcagtg
gcagcctagt cgcagggctc tgagcgccgc gacggcagga tgtgagcttc
11760cttacataga agaggcggat gaaggcgagg aggaagaggg cgagtacttg
gaagactgat 11820ggcacaaccc gtgttttttg ctagatggaa cagcaagcac
cggatcccgc aatgcgggcg 11880gcgctgcaga gccagccgtc cggcattaac
tcctcggacg attggaccca ggccatgcaa 11940cgtatcatgg cgttgacgac
tcgcaacccc gaagccttta gacagcaacc ccaggccaac 12000cgtctatcgg
ccatcatgga agctgtagtg ccttcccgat ctaatcccac tcatgagaag
12060gtcctggcca tcgtgaacgc gttggtggag aacaaagcta ttcgtccaga
tgaggccgga 12120ctggtataca acgctctctt agaacgcgtg gctcgctaca
acagtagcaa tgtgcaaacc 12180aatttggacc gtatgataac agatgtacgc
gaagccgtgt ctcagcgcga aaggttccag 12240cgtgatgcca acctgggttc
gctggtggcg ttaaatgctt tcttgagtac tcagcctgct 12300aatgtgccgc
gtggtcaaca ggattatact aactttttaa gtgctttgag actgatggta
12360tcagaagtac ctcagagcga agtgtatcag tccggtcctg attacttctt
tcagactagc 12420agacagggct tgcagacggt aaatctgagc caagctttta
aaaaccttaa aggtttgtgg 12480ggagtgcatg ccccggtagg agaaagagca
accgtgtcta gcttgttaac tccgaactcc 12540cgcctgttat tactgttggt
agctcctttc accgacagcg gtagcatcga ccgtaattcc 12600tatttgggtt
acctactaaa cctgtatcgc gaagccatag ggcaaagtca ggtggacgag
12660cagacctatc aagaaattac ccaagtcagt cgcgctttgg gacaggaaga
cactggcagt 12720ttggaagcca ctctgaactt cttgcttacc aatcggtctc
aaaagatccc tcctcaatat 12780gctcttactg cggaggagga gaggatcctt
agatatgtgc agcagagcgt gggattgttt 12840ctgatgcaag agggggcaac
tccgactgca gcactggaca tgacagcgcg aaatatggag 12900cccagcatgt
atgccagtaa ccgacctttc attaacaaac tgctggacta cttgcacaga
12960gctgccgcta tgaactctga ttatttcacc aatgccatct taaacccgca
ctggctgccc 13020ccacctggtt tctacacggg cgaatatgac atgcccgacc
ctaatgacgg atttctgtgg 13080gacgacgtgg acagcgatgt tttttcacct
ctttctgatc atcgcacgtg gaaaaaggaa 13140ggcggtgata gaatgcattc
ttctgcatcg ctgtccgggg tcatgggtgc taccgcggct 13200gagcccgagt
ctgcaagtcc ttttcctagt ctaccctttt ctctacacag tgtacgtagc
13260agcgaagtgg gtagaataag tcgcccgagt ttaatgggcg aagaggagta
cctaaacgat 13320tccttgctca gaccggcaag agaaaaaaat ttcccaaaca
atggaataga aagtttggtg 13380gataaaatga gtagatggaa gacttatgct
caggatcaca gagacgagcc tgggatcatg 13440gggactacaa gtagagcgag
ccgtagacgc cagcgccatg acagacagag gggtcttgtg 13500tgggacgatg
aggattcggc cgatgatagc agcgtgttgg acttgggtgg gagaggaagg
13560ggcaacccgt ttgctcattt gcgccctcgc ttgggtggta tgttgtgaaa
aaaaataaaa 13620aagaaaaact caccaaggcc atggcgacga gcgtacgttc
gttcttcttt attatctgtg 13680tctagtataa tgaggcgagt cgtgctaggc
ggagcggtgg tgtatccgga gggtcctcct 13740ccttcgtacg agagcgtgat
gcagcagcag caggcgacgg cggtgatgca atccccactg 13800gaggctccct
ttgtgcctcc gcgatacctg gcacctacgg agggcagaaa cagcattcgt
13860tactcggaac tggcacctca gtacgatacc accaggttgt atctggtgga
caacaagtcg 13920gcggacattg cttctctgaa ctatcagaat gaccacagca
acttcttgac cacggtggtg 13980cagaacaatg actttacccc tacggaagcc
agcacccaga ccattaactt tgatgaacga 14040tcgcggtggg gcggtcagct
aaagaccatc atgcatacta acatgccaaa cgtgaacgag 14100tatatgttta
gtaacaagtt caaagcgcgt gtgatggtgt ccagaaaacc tcccgacggt
14160gctgcagttg gggatactta tgatcacaag caggatattt tggaatatga
gtggttcgag 14220tttactttgc cagaaggcaa cttttcagtt actatgacta
ttgatttgat gaacaatgcc 14280atcatagata attacttgaa agtgggtaga
cagaatggag tgcttgaaag tgacattggt 14340gttaagttcg acaccaggaa
cttcaagctg ggatgggatc ccgaaaccaa gttgatcatg 14400cctggagtgt
atacgtatga agccttccat cctgacattg tcttactgcc tggctgcgga
14460gtggatttta ccgagagtcg tttgagcaac cttcttggta tcagaaaaaa
acagccattt 14520caagagggtt ttaagatttt gtatgaagat ttagaaggtg
gtaatattcc ggccctcttg 14580gatgtagatg cctatgagaa cagtaagaaa
gaacaaaaag ccaaaataga agctgctaca 14640gctgctgcag aagctaaggc
aaacatagtt gccagcgact ctacaagggt tgctaacgct 14700ggagaggtca
gaggagacaa ttttgcgcca acacctgttc cgactgcaga atcattattg
14760gccgatgtgt ctgaaggaac ggacgtgaaa ctcactattc aacctgtaga
aaaagatagt 14820aagaatagaa gctataatgt gttggaagac aaaatcaaca
cagcctatcg cagttggtat 14880ctttcgtaca attatggcga tcccgaaaaa
ggagtgcgtt cctggacatt gctcaccacc 14940tcagatgtca cctgcggagc
agagcaggtt tactggtcgc ttccagacat gatgaaggat 15000cctgtcactt
tccgctccac tagacaagtc agtaactacc ctgtggtggg tgcagagctt
15060atgcccgtct tctcaaagag cttctacaac gaacaagctg tgtactccca
gcagctccgc 15120cagtccacct cgcttacgca cgtcttcaac cgctttcctg
agaaccagat tttaatccgt 15180ccgccggcgc ccaccattac caccgtcagt
gaaaacgttc ctgctctcac agatcacggg 15240accctgccgt tgcgcagcag
tatccgggga gtccaacgtg tgaccgttac tgacgccaga 15300cgccgcacct
gtccctacgt gtacaaggca ctgggcatag tcgcaccgcg cgtcctttca
15360agccgcactt tctaaaaaaa aaaaatgtcc attcttatct cgcccagtaa
taacaccggt 15420tggggtctgc gcgctccaag caagatgtac ggaggcgcac
gcaaacgttc tacccaacat 15480cccgtgcgtg ttcgcggaca ttttcgcgct
ccatggggtg ccctcaaggg ccgcactcgc 15540gttcgaacca ccgtcgatga
tgtaatcgat caggtggttg ccgacgcccg taattatact 15600cctactgcgc
ctacatctac tgtggatgca gttattgaca gtgtagtggc tgacgctcgc
15660aactatgctc gacgtaagag ccggcgaagg cgcattgcca gacgccaccg
agctaccact 15720gccatgcgag ccgcaagagc tctgctacga agagctagac
gcgtggggcg aagagccatg 15780cttagggcgg ccagacgtgc agcttcgggc
gccagcgccg gcaggtcccg caggcaagca 15840gccgctgtcg cagcggcgac
tattgccgac atggcccaat cgcgaagagg caatgtatac 15900tgggtgcgtg
acgctgccac cggtcaacgt gtacccgtgc gcacccgtcc ccctcgcact
15960tagaagatac tgagcagtct ccgatgttgt gtcccagcgg cgaggatgtc
caagcgcaaa 16020tacaaggaag aaatgctgca ggttatcgca cctgaagtct
acggccaacc gttgaaggat 16080gaaaaaaaac cccgcaaaat caagcgggtt
aaaaaggaca aaaaagaaga ggaagatggc 16140gatgatgggc tggcggagtt
tgtgcgcgag tttgccccac ggcgacgcgt gcaatggcgt 16200gggcgcaaag
ttcgacatgt gttgagacct ggaacttcgg tggtctttac acccggcgag
16260cgttcaagcg ctacttttaa gcgttcctat gatgaggtgt acggggatga
tgatattctt 16320gagcaggcgg ctgaccgatt aggcgagttt gcttatggca
agcgtagtag aataacttcc 16380aaggatgaga cagtgtcaat acccttggat
catggaaatc ccacccctag tcttaaaccg 16440gtcactttgc agcaagtgtt
acccgtaact ccgcgaacag gtgttaaacg cgaaggtgaa 16500gatttgtatc
ccactatgca actgatggta cccaaacgcc agaagttgga ggacgttttg
16560gagaaagtaa aagtggatcc agatattcaa cctgaggtta aagtgagacc
cattaagcag 16620gtagcgcctg gtctgggggt acaaactgta gacattaaga
ttcccactga aagtatggaa 16680gtgcaaactg aacccgcaaa gcctactgcc
acctccactg aagtgcaaac ggatccatgg 16740atgcccatgc ctattacaac
tgacgccgcc ggtcccactc gaagatcccg acgaaagtac 16800ggtccagcaa
gtctgttgat gcccaattat gttgtacacc catctattat tcctactcct
16860ggttaccgag gcactcgcta ctatcgcagc cgaaacagta cctcccgccg
tcgccgcaag 16920acacctgcaa atcgcagtcg tcgccgtaga cgcacaagca
aaccgactcc cggcgccctg 16980gtgcggcaag tgtaccgcaa tggtagtgcg
gaacctttga cactgccgcg tgcgcgttac 17040catccgagta tcatcactta
atcaatgttg ccgctgcctc cttgcagata tggccctcac 17100ttgtcgcctt
cgcgttccca tcactggtta ccgaggaaga aactcgcgcc gtagaagagg
17160gatgttggga cgcggaatgc gacgctacag gcgacggcgt gctatccgca
agcaattgcg 17220gggtggtttt ttaccagcct taattccaat tatcgctgct
gcaattggcg cgataccagg 17280catagcttcc gtggcggttc aggcctcgca
acgacattga cattggaaaa aaaacgtata 17340aataaaaaaa aatacaatgg
actctgacac tcctggtcct gtgactatgt tttcttagag 17400atggaagaca
tcaatttttc atccttggct ccgcgacacg gcacgaagcc gtacatgggc
17460acctggagcg acatcggcac gagccaactg aacgggggcg ccttcaattg
gagcagtatc 17520tggagcgggc ttaaaaattt tggctcaacc ataaaaacat
acgggaacaa agcttggaac 17580agcagtacag gacaggcgct tagaaataaa
cttaaagacc agaacttcca acaaaaagta 17640gtcgatggga tagcttccgg
catcaatgga gtggtagatt tggctaacca ggctgtgcag 17700aaaaagataa
acagtcgttt ggacccgccg ccagcaaccc caggtgaaat gcaagtggag
17760gaagaaattc ctccgccaga aaaacgaggc gacaagcgtc cgcgtcccga
tttggaagag 17820acgctggtga cgcgcgtaga tgaaccgcct tcttatgagg
aagcaacgaa gcttggaatg 17880cccaccacta gaccgatagc cccaatggcc
accggggtga tgaaaccttc tcagttgcat 17940cgacccgtca ccttggattt
gccccctccc cctgctgcta ctgctgtacc cgcttctaag 18000cctgtcgctg
ccccgaaacc agtcgccgta gccaggtcac gtcccggggg cgctcctcgt
18060ccaaatgcgc actggcaaaa tactctgaac agcatcgtgg gtctaggcgt
gcaaagtgta 18120aaacgccgtc gctgctttta attaaatatg gagtagcgct
taacttgcct atctgtgtat 18180atgtgtcatt acacgccgtc acagcagcag
aggaaaaaag gaagaggtcg tgcgtcgacg 18240ctgagttact ttcaagatgg
ccaccccatc gatgctgccc caatgggcat acatgcacat 18300cgccggacag
gatgcttcgg agtacctgag tccgggtctg gtgcagttcg cccgcgccac
18360agacacctac ttcaatctgg gaaataagtt tagaaatccc accgtagcgc
cgacccacga 18420tgtgaccacc gaccgtagcc agcggctcat gttgcgcttc
gtgcccgttg accgggagga 18480caatacatac tcttacaaag tgcggtacac
cctggccgtg ggcgacaaca gagtgctgga 18540tatggccagc acgttctttg
acattagggg cgtgttggac agaggtccca gtttcaaacc 18600ctattctggt
acggcttaca actctctggc tcctaaaggc gctccaaatg catctcaatg
18660gattgcaaaa ggcgtaccaa ctgcagcagc cgcaggcaat ggtgaagaag
aacatgaaac 18720agaggagaaa actgctactt acacttttgc caatgctcct
gtaaaagccg aggctcaaat 18780tacaaaagag ggcttaccaa taggtttgga
gatttcagct gaaaacgaat ctaaacccat 18840ctatgcagat aaactttatc
agccagaacc tcaagtggga gatgaaactt ggactgacct 18900agacggaaaa
accgaagagt atggaggcag ggctctaaag cctactacta acatgaaacc
18960ctgttacggg tcctatgcga agcctactaa tttaaaaggt ggtcaggcaa
aaccgaaaaa 19020ctcggaaccg tcgagtgaaa aaattgaata tgatattgac
atggaatttt ttgataactc 19080atcgcaaaga acaaacttca gtcctaaaat
tgtcatgtat gcagaaaatg taggtttgga 19140aacgccagac actcatgtag
tgtacaaacc tggaacagaa gacacaagtt ccgaagctaa 19200tttgggacaa
cagtctatgc ccaacagacc caactacatt ggcttcagag ataactttat
19260tggactcatg tactataaca gtactggtaa catgggggtg ctggctggtc
aagcgtctca 19320gttaaatgca gtggttgact tgcaggacag aaacacagaa
ctttcttacc aactcttgct 19380tgactctctg ggcgacagaa ccagatactt
tagcatgtgg aatcaggctg tggacagtta 19440tgatcctgat gtacgtgtta
ttgaaaatca tggtgtggaa gatgaacttc ccaactattg 19500ttttccactg
gacggcatag gtgttccaac aaccagttac aaatcaatag ttccaaatgg
19560agaagataat aataattgga aagaacctga agtaaatgga acaagtgaga
tcggacaggg 19620taatttgttt gccatggaaa ttaaccttca agccaatcta
tggcgaagtt tcctttattc 19680caatgtggct ctgtatctcc cagactcgta
caaatacacc ccgtccaatg tcactcttcc 19740agaaaacaaa aacacctacg
actacatgaa cgggcgggtg gtgccgccat ctctagtaga 19800cacctatgtg
aacattggtg ccaggtggtc tctggatgcc atggacaatg tcaacccatt
19860caaccaccac cgtaacgctg gcttgcgtta ccgatctatg cttctgggta
acggacgtta 19920tgtgcctttc cacatacaag tgcctcaaaa attcttcgct
gttaaaaacc tgctgcttct 19980cccaggctcc tacacttatg agtggaactt
taggaaggat gtgaacatgg ttctacagag 20040ttccctcggt aacgacctgc
gggtagatgg cgccagcatc agtttcacga gcatcaacct 20100ctatgctact
tttttcccca tggctcacaa caccgcttcc acccttgaag ccatgctgcg
20160gaatgacacc aatgatcagt cattcaacga ctacctatct gcagctaaca
tgctctaccc 20220cattcctgcc aatgcaacca atattcccat ttccattcct
tctcgcaact gggcggcttt 20280cagaggctgg tcatttacca gactgaaaac
caaagaaact ccctctttgg ggtctggatt 20340tgacccctac tttgtctatt
ctggttctat tccctacctg gatggtacct tctacctgaa 20400ccacactttt
aagaaggttt ccatcatgtt tgactcttca gtgagctggc ctggaaatga
20460caggttacta tctcctaacg aatttgaaat aaagcgcact gtggatggcg
aaggctacaa 20520cgtagcccaa tgcaacatga ccaaagactg gttcttggta
cagatgctcg ccaactacaa 20580catcggctat cagggcttct acattccaga
aggatacaaa gatcgcatgt attcattttt 20640cagaaacttc cagcccatga
gcaggcaggt ggttgatgag gtcaattaca aagacttcaa 20700ggccgtcgcc
ataccctacc aacacaacaa ctctggcttt gtgggttaca tggctccgac
20760catgcgccaa ggtcaaccct atcccgctaa ctatccctat ccactcattg
gaacaactgc 20820cgtaaatagt gttacgcaga aaaagttctt gtgtgacaga
accatgtggc gcataccgtt 20880ctcgagcaac ttcatgtcta tgggggccct
tacagacttg ggacagaata tgctctatgc 20940caactcagct catgctctgg
acatgacctt tgaggtggat cccatggatg agcccaccct 21000gctttatctt
ctcttcgaag ttttcgacgt ggtcagagtg catcagccac accgcggcat
21060catcgaggca gtctacctgc gtacaccgtt ctcggccggt aacgctacca
cgtaagaagc 21120ttcttgcttc ttgcaaatag cagctgcaac catggcctgc
ggatcccaaa acggctccag 21180cgagcaagag ctcagagcca ttgtccaaga
cctgggttgc ggaccctatt ttttgggaac 21240ctacgataag cgcttcccgg
ggttcatggc ccccgataag ctcgcctgtg ccattgtaaa 21300tacggccgga
cgtgagacgg ggggagagca ctggttggct ttcggttgga acccacgttc
21360taacacctgc tacctttttg atccttttgg attctcggat gatcgtctca
aacagattta 21420ccagtttgaa tatgagggtc tcctgcgccg cagcgctctt
gctaccaagg accgctgtat 21480tacgctggaa aaatctaccc agaccgtgca
gggcccccgt tctgccgcct gcggactttt 21540ctgctgcatg ttccttcacg
cctttgtgca ctggcctgac cgtcccatgg acggaaaccc 21600caccatgaaa
ttgctaactg gagtgccaaa caacatgctt cattctccta aagtccagcc
21660caccctgtgt gacaatcaaa aagcactcta ccattttctt aatacccatt
cgccttattt 21720tcgctctcat cgtacacaca tcgaaagggc cactgcgttc
gaccgtatgg atgttcaata 21780atgactcatg taaacaacgt gttcaataaa
catcacttta tttttttaca tgtatcaagg 21840ctctggatta cttatttatt
tacaagtcga atgggttctg acgagaatca gaatgacccg 21900caggcagtga
tacgttgcgg aactgatact tgggttgcca cttgaattcg ggaatcacca
21960acttgggaac cggtatatcg ggcaggatgt cactccacag ctttctggtc
agctgcaaag 22020ctccaagcag gtcaggagcc gaaatcttga aatcacaatt
aggaccagtg ctctgagcgc 22080gagagttgcg gtacaccgga ttgcagcact
gaaacaccat cagcgacgga tgtctcacgc 22140ttgccagcac ggtgggatct
gcaatcatgc ccacatccag atcttcagca ttggcaatgc 22200tgaacggggt
catcttgcag gtctgcctac ccatggcggg cacccaatta ggcttgtggt
22260tgcaatcgca gtgcaggggg atcagtatca tcttggcctg atcctgtctg
attcctggat 22320acacggctct catgaaagca tcatattgct tgaaagcctg
ctgggcttta ctaccctcgg 22380tataaaacat cccgcaggac ctgctcgaaa
actggttagc tgcacagccg gcatcattca 22440cacagcagcg ggcgtcattg
ttggctattt gcaccacact tctgccccag cggttttggg 22500tgattttggt
tcgctcggga ttctccttta aggctcgttg tccgttctcg ctggccacat
22560ccatctcgat aatctgctcc ttctgaatca taatattgcc atgcaggcac
ttcagcttgc 22620cctcataatc attgcagcca tgaggccaca acgcacagcc
tgtacattcc caattatggt 22680gggcgatctg agaaaaagaa tgtatcattc
cctgcagaaa tcttcccatc atcgtgctca 22740gtgtcttgtg actagtgaaa
gttaactgga tgcctcggtg ctcttcgttt acgtactggt 22800gacagatgcg
cttgtattgt tcgtgttgct caggcattag tttaaaacag gttctaagtt
22860cgttatccag cctgtacttc tccatcagca gacacatcac ttccatgcct
ttctcccaag 22920cagacaccag gggcaagcta atcggattct taacagtgca
ggcagcagct cctttagcca 22980gagggtcatc tttagcgatc ttctcaatgc
ttcttttgcc atccttctca acgatgcgca 23040cgggcgggta gctgaaaccc
actgctacaa gttgcgcctc ttctctttct tcttcgctgt 23100cttgactgat
gtcttgcatg gggatatgtt tggtcttcct tggcttcttt ttggggggta
23160tcggaggagg aggactgtcg ctccgttccg gagacaggga ggattgtgac
gtttcgctca 23220ccattaccaa ctgactgtcg gtagaagaac ctgaccccac
acggcgacag gtgtttttct 23280tcgggggcag aggtggaggc gattgcgaag
ggctgcggtc cgacctggaa ggcggatgac 23340tggcagaacc ccttccgcgt
tcgggggtgt gctccctgtg gcggtcgctt aactgatttc 23400cttcgcggct
ggccattgtg ttctcctagg cagagaaaca acagacatgg aaactcagcc
23460attgctgtca acatcgccac gagtgccatc acatctcgtc ctcagcgacg
aggaaaagga 23520gcagagctta agcattccac cgcccagtcc tgccaccacc
tctaccctag aagataagga 23580ggtcgacgca tctcatgaca tgcagaataa
aaaagcgaaa gagtctgaga cagacatcga 23640gcaagacccg ggctatgtga
caccggtgga acacgaggaa gagttgaaac gctttctaga 23700gagagaggat
gaaaactgcc caaaacagcg agcagataac tatcaccaag atgctggaaa
23760tagggatcag aacaccgact acctcatagg gcttgacggg gaagacgcgc
tccttaaaca 23820tctagcaaga cagtcgctca tagtcaagga tgcattattg
gacagaactg aagtgcccat 23880cagtgtggaa gagctcagct gcgcctacga
gcttaacctt ttttcacctc gtactccccc 23940caaacgtcag ccaaacggca
cctgcgagcc aaatcctcgc ttaaactttt atccagcttt 24000tgctgtgcca
gaagtactgg ctacctatca catctttttt aaaaatcaaa aaattccagt
24060ctcctgccgc gctaatcgca cccgcgccga tgccctactc aatctgggac
ctggttcacg 24120cttacctgat atagcttcct tggaagaggt tccaaagatc
ttcgagggtc tgggcaataa 24180tgagactcgg gccgcaaatg ctctgcaaaa
gggagaaaat
ggcatggatg agcatcacag 24240cgttctggtg gaattggaag gcgataatgc
cagactcgca gtactcaagc gaagcgtcga 24300ggtcacacac ttcgcatatc
ccgctgtcaa cctgccccct aaagtcatga cggcggtcat 24360ggaccagtta
ctcattaagc gcgcaagtcc cctttcagaa gacatgcatg acccagatgc
24420ctgtgatgag ggtaaaccag tggtcagtga tgagcagcta acccgatggc
tgggcaccga 24480ctctccccgg gatttggaag agcgtcgcaa gcttatgatg
gccgtggtgc tggttaccgt 24540agaactagag tgtctccgac gtttctttac
cgattcagaa accttgcgca aactcgaaga 24600gaatctgcac tacactttta
gacacggctt tgtgcggcag gcatgcaaga tatctaacgt 24660ggaactcacc
aacctggttt cctacatggg tattctgcat gagaatcgcc taggacaaag
24720cgtgctgcac agcaccctta agggggaagc ccgccgtgat tacatccgcg
attgtgtcta 24780tctctacctg tgccacacgt ggcaaaccgg catgggtgta
tggcagcaat gtttagaaga 24840acagaacttg aaagagcttg acaagctctt
acagaaatct cttaaggttc tgtggacagg 24900gttcgacgag cgcaccgtcg
cttccgacct ggcagacctc atcttcccag agcgtctcag 24960ggttactttg
cgaaacggat tgcctgactt tatgagccag agcatgctta acaattttcg
25020ctctttcatc ctggaacgct ccggtatcct gcccgccacc tgctgcgcac
tgccctccga 25080ctttgtgcct ctcacctacc gcgagtgccc cccgccgcta
tggagtcact gctacctgtt 25140ccgtctggcc aactatctct cctaccactc
ggatgtgatc gaggatgtga gcggagacgg 25200cttgctggag tgccactgcc
gctgcaatct gtgcacgccc caccggtccc tagcttgcaa 25260cccccagttg
atgagcgaaa cccagataat aggcaccttt gaattgcaag gccccagcag
25320ccaaggcgat gggtcttctc ctgggcaaag tttaaaactg accccgggac
tgtggacctc 25380cgcctacttg cgcaagtttg ctccggaaga ttaccacccc
tatgaaatca agttctatga 25440ggaccaatca cagcctccaa aggccgaact
ttcggcttgc gtcatcaccc agggggcaat 25500tctggcccaa ttgcaagcca
tccaaaaatc ccgccaagaa tttctactga aaaagggtaa 25560gggggtctac
cttgaccccc agaccggcga ggaactcaac acaaggttcc ctcaggatgt
25620cccaacgacg agaaaacaag aagttgaagg tgcagccgcc gcccccagaa
gatatggagg 25680aagattggga cagtcaggca gaggaggcgg aggaggacag
tctggaggac agtctggagg 25740aagacagttt ggaggaggaa aacgaggagg
cagaggaggt ggaagaagta accgccgaca 25800aacagttatc ctcggctgcg
gagacaagca acagcgctac catctccgct ccgagtcgag 25860gaacccggcg
gcgtcccagc agtagatggg acgagaccgg acgcttcccg aacccaacca
25920gcgcttccaa gaccggtaag aaggatcggc agggatacaa gtcctggcgg
gggcataaga 25980atgccatcat ctcctgcttg catgagtgcg ggggcaacat
atccttcacg cggcgctact 26040tgctattcca ccatggggtg aactttccgc
gcaatgtttt gcattactac cgtcacctcc 26100acagccccta ctatagccag
caaatcccga cagtctcgac agataaagac agcggcggcg 26160acctccaaca
gaaaaccagc agcggcagtt agaaaataca caacaagtgc agcaacagga
26220ggattaaaga ttacagccaa cgagccagcg caaacccgag agttaagaaa
tcggatcttt 26280ccaaccctgt atgccatctt ccagcagagt cggggtcaag
agcaggaact gaaaataaaa 26340aaccgatctc tgcgttcgct caccagaagt
tgtttgtatc acaagagcga agatcaactt 26400cagcgcactc tcgaggacgc
cgaggctctc ttcaacaagt actgcgcgct gactcttaaa 26460gagtaggcag
cgaccgcgct tattcaaaaa aggcgggaat tacatcatcc tcgacatgag
26520taaagaaatt cccacgcctt acatgtggag ttatcaaccc caaatgggat
tggcagcagg 26580cgcctcccag gactactcca cccgcatgaa ttggctcagc
gccgggcctt ctatgatttc 26640tcgagttaat gatatacgcg cctaccgaaa
ccaaatactt ttggaacagt cagctcttac 26700caccacgccc cgccaacacc
ttaatcccag aaattggccc gccgccctag tgtaccagga 26760aagtcccgct
cccaccactg tattacttcc tcgagacgcc caggccgaag tccaaatgac
26820taatgcaggt gcgcagttag ctggcggctc caccctatgt cgtcacaggc
ctcggcataa 26880tataaaacgc ctgatgatca gaggccgagg tatccagctc
aacgacgagt cggtgagctc 26940tccgcttggt ctacgaccag acggaatctt
tcagattgcc ggctgcggga gatcttcctt 27000cacccctcgt caggctgttc
tgactttgga aagttcgtct tcgcaacccc gctcgggcgg 27060aatcgggacc
gttcaatttg tagaggagtt tactccctct gtctacttca accccttctc
27120cggatctcct gggcactacc cggacgagtt cataccgaac ttcgacgcga
ttagcgagtc 27180agtggacggc tacgattgat gtctggtgac gcggctgagc
tatctcggct gcgacatcta 27240gaccactgcc gccgctttcg ctgctttgcc
cgggaactta ttgagttcat ctacttcgaa 27300ctccccaagg atcaccctca
aggtccggcc cacggagtgc ggattactat cgaaggcaaa 27360atagactctc
gcctgcaacg aattttctcc cagcggcccg tgctgatcga gcgagaccag
27420ggaaacacca cggtttccat ctactgcatt tgtaatcacc ccggattgca
tgaaagcctt 27480tgctgtctta tgtgtactga gtttaataaa aactgaatta
agactctcct acggactgcc 27540gcttcttcaa cccggatttt acaaccagaa
gaacaaaact tttcctgtcg tccaggactc 27600tgttaacttc acctttccta
ctcacaaact agaagctcaa cgactacacc gcttttccag 27660aagcattttc
cctactaata ctactttcaa aaccggaggt gagctccacg gtctccctac
27720agaaaaccct tgggtggaag cgggccttgt agtactagga attcttgcgg
gtgggcttgt 27780gattattctt tgctacctat acacaccttg cttcactttc
ctagtggtgt tgtggtattg 27840gtttaaaaaa tggggcccat actagtcttg
cttgttttac tttcgctttt ggaaccgggt 27900tctgccaatt acgatccatg
tctagacttt gacccagaaa actgcacact tacttttgca 27960cccgacacaa
gccgcatctg tggagttctt attaagtgcg gatgggaatg caggtccgtt
28020gaaattacac acaataacaa aacctggaac aataccttat ccaccacatg
ggagccagga 28080gttcccgagt ggtacactgt ctctgtccga ggtcctgacg
gttccatccg cattagtaac 28140aacactttca ttttttctga aatgtgcgat
ctggccatgt tcatgagcaa acagtattct 28200ctatggcctc ctagcaagga
caacatcgta acgttctcca ttgcttattg cttgtgcgct 28260tgccttctta
ctgctttact gtgcgtatgc atacacctgc ttgtaaccac tcgcatcaaa
28320aacgccaata acaaagaaaa aatgccttaa cctctttctg tttacagaca
tggcttctct 28380tacatctctc atatttgtca gcattgtcac tgccgctcac
ggacaaacag tcgtctctat 28440cccactagga cataattaca ctctcatagg
acccccaatc acttcagagg tcatctggac 28500caaactggga agcgttgatt
actttgatat aatctgtaac aaaacaaaac caataatagt 28560aacttgcaac
atacaaaatc ttacattgat taatgttagc aaagtttaca gcggttacta
28620ttatggttat gacagataca gtagtcaata tagaaattac ttggttcgtg
ttacccagtt 28680gaaaaccacg aaaatgccaa atatggcaaa gattcgatcc
gatgacaatt ctctagaaac 28740ttttacatct cccaccacac ccgacgaaaa
aaacatccca gattcaatga ttgcaattgt 28800tgcagcggtg gcagtggtga
tggcactaat aataatatgc atgcttttat atgcttgtcg 28860ctacaaaaag
tttcatccta aaaaacaaga tctcctacta aggcttaaca tttaatttct
28920ttttatacag ccatggtttc cactaccaca ttccttatgc ttactagtct
cgcaactctg 28980acttctgctc gctcacacct cactgtaact ataggctcaa
actgcacact aaaaggacct 29040caaggtggtc atgtcttttg gtggagaata
tatgacaatg gatggtttac aaaaccatgt 29100gaccaacctg gtagattttt
ctgcaacggc agagacctaa ccattatcaa cgtgacagca 29160aatgacaaag
gcttctatta tggaaccgac tataaaagta gtttagatta taacattatt
29220gtactgccat ctaccactcc agcaccccgc acaactactt tctctagcag
cagtgtcgct 29280aacaatacaa tttccaatcc aacctttgcc gcgcttttaa
aacgcactgt gaataattct 29340acaacttcac atacaacaat ttccacttca
acaatcagca tcatcgctgc agtgacaatt 29400ggaatatcta ttcttgtttt
taccataacc tactacgcct gctgctatag aaaagacaaa 29460cataaaggtg
atccattact tagatttgat atttaatttg ttcttttttt ttatttacag
29520tatggtgaac accaatcatg gtacctagaa atttcttctt caccatactc
atctgtgctt 29580ttaatgtttg cgctactttc acagcagtag ccacagcaac
cccagactgt ataggagcat 29640ttgcttccta tgcacttttt gcttttgtta
cttgcatctg cgtatgtagc atagtctgcc 29700tggttattaa ttttttccaa
cttctagact ggatccttgt gcgaattgcc tacctgcgcc 29760accatcccga
ataccgcaac caaaatatcg cggcacttct tagactcatc taaaaccatg
29820caggctatac taccaatatt tttgcttcta ttgcttccct acgctgtctc
aaccccagct 29880gcctatagta ctccaccaga acaccttaga aaatgcaaat
tccaacaacc gtggtcattt 29940cttgcttgct atcgagaaaa atcagaaatc
cccccaaatt taataatgat tgctggaata 30000attaatataa tctgttgcac
cataatttca tttttgatat accccctatt tgattttggc 30060tggaatgctc
ccaatgcaca tgatcatcca caagacccag aggaacacat tcccccacaa
30120aacatgcaac atccaatagc gctaatagat tacgaaagtg aaccacaacc
cccactactc 30180cctgctatta gttacttcaa cctaaccggc ggagatgact
gaaacactca ccacctccaa 30240ttccgccgag gatctgctcg atatggacgg
ccgcgtctca gaacaacgac ttgcccaact 30300acgcatccgc cagcagcagg
aacgcgtggc caaagagctc agagatgtca tccaaattca 30360ccaatgcaaa
aaaggcatat tctgtttggt aaaacaagcc aagatatcct acgagatcac
30420cgctactgac catcgcctct cttacgaact tggcccccaa cgacaaaaat
ttacctgcat 30480ggtgggaatc aaccccatag ttatcaccca acaaagtgga
gatactaagg gttgcattca 30540ctgctcctgc gattccatcg agtgcaccta
caccctgctg aagaccctat gcggcctaag 30600agacctgcta ccaatgaatt
aaaaaaaaat gattaataaa aaatcactta cttgaaatca 30660gcaataaggt
ctctgttgaa attttctccc agcagcacct cacttccctc ttcccaactc
30720tggtattcta aaccccgttc agcggcatac tttctccata ctttaaaggg
gatgtcaaat 30780tttagctcct ctcctgtacc cacaatcttc atgtctttct
tcccagatga ccaagagagt 30840ccggctcagt gactccttca accctgtcta
cccctatgaa gatgaaagca cctcccaaca 30900cccctttata aacccagggt
ttatttcccc aaatggcttc acacaaagcc cagacggagt 30960tcttacttta
aaatgtttaa ccccactaac aaccacaggc ggatctctac agctaaaagt
31020gggaggggga cttacagtgg atgacactga tggtacctta caagaaaaca
tacgtgctac 31080agcacccatt actaaaaata atcactctgt agaactatcc
attggaaatg gattagaaac 31140tcaaaacaat aaactatgtg ccaaattggg
aaatgggtta aaatttaaca acggtgacat 31200ttgtataaag gatagtatta
acaccttatg gactggaata aaccctccac ctaactgtca 31260aattgtggaa
aacactaata caaatgatgg caaacttact ttagtattag taaaaaatgg
31320agggcttgtt aatggctacg tgtctctagt tggtgtatca gacactgtga
accaaatgtt 31380cacacaaaag acagcaaaca tccaattaag attatatttt
gactcttctg gaaatctatt 31440aactgaggaa tcagacttaa aaattccact
taaaaataaa tcttctacag cgaccagtga 31500aactgtagcc agcagcaaag
cctttatgcc aagtactaca gcttatccct tcaacaccac 31560tactagggat
agtgaaaact acattcatgg aatatgttac tacatgacta gttatgatag
31620aagtctattt cccttgaaca tttctataat gctaaacagc cgtatgattt
cttccaatgt 31680tgcctatgcc atacaatttg aatggaatct aaatgcaagt
gaatctccag aaagcaacat 31740agctacgctg accacatccc cctttttctt
ttcttacatt acagaagacg acaactaaaa 31800taaagtttaa gtgtttttat
ttaaaatcac aaaattcgag tagttatttt gcctccacct 31860tcccatttga
cagaatacac caatctctcc ccacgcacag ctttaaacat ttggatacca
31920ttagagatag acattgtttt agattccaca ttccaaacag tttcagagcg
agccaatctg 31980gggtcagtga tagataaaaa tccatcgcga tagtctttta
aagcgctttc acagtccaac 32040tgctgcggat gcgactccgg agtttggatc
acggtcatct ggaagaagaa cgatgggaat 32100cataatccga aaacggtatc
ggacgattgt gtctcatcaa acccacaagc agccgctgtc 32160tgcgtcgctc
cgtgcgactg ctgtttatgg gatcagggtc cacagtttcc tgaagcatga
32220ttttaatagc ccttaacatc aactttctgg tgcgatgcgc gcagcaacgc
attctgattt 32280cactcaaatc tttgcagtag gtacaacaca ttattacaat
attgtttaat aaaccataat 32340taaaagcgct ccagccaaaa ctcatatctg
atataatcgc ccctgcatga ccatcatacc 32400aaagtttaat ataaattaaa
tgacgttccc tcaaaaacac actacccaca tacatgatct 32460cttttggcat
gtgcatatta acaatctgtc tgtaccatgg acaacgttgg ttaatcatgc
32520aacccaatat aaccttccgg aaccacactg ccaacaccgc tcccccagcc
atgcattgaa 32580gtgaaccctg ctgattacaa tgacaatgaa gaacccaatt
ctctcgaccg tgaatcactt 32640gagaatgaaa aatatctata gtggcacaac
atagacataa atgcatgcat cttctcataa 32700tttttaactc ctcaggattt
agaaacatat cccagggaat aggaagctct tgcagaacag 32760taaagctggc
agaacaagga agaccacgaa cacaacttac actatgcata gtcatagtat
32820cacaatctgg caacagcggg tggtcttcag tcatagaagc tcgggtttca
ttttcctcac 32880aacgtggtaa ctgggctctg gtgtaagggt gatgtctggc
gcatgatgtc gagcgtgcgc 32940gcaaccttgt cataatggag ttgcttcctg
acattctcgt attttgtata gcaaaacgcg 33000gccctggcag aacacactct
tcttcgcctt ctatcctgcc gcttagcgtg ttccgtgtga 33060tagttcaagt
acagccacac tcttaagttg gtcaaaagaa tgctggcttc agttgtaatc
33120aaaactccat cgcatctaat tgttctgagg aaatcatcca cggtagcata
tgcaaatccc 33180aaccaagcaa tgcaactgga ttgcgtttca agcaggagag
gagagggaag agacggaaga 33240accatgttaa tttttattcc aaacgatctc
gcagtacttc aaattgtaga tcgcgcagat 33300ggcatctctc gcccccactg
tgttggtgaa aaagcacagc taaatcaaaa gaaatgcgat 33360tttcaaggtg
ctcaacggtg gcttccaaca aagcctccac gcgcacatcc aagaacaaaa
33420gaataccaaa agaaggagca ttttctaact cctcaatcat catattacat
tcctgcacca 33480ttcccagata attttcagct ttccagcctt gaattattcg
tgtcagttct tgtggtaaat 33540ccaatccaca cattacaaac aggtcccgga
gggcgccctc caccaccatt cttaaacaca 33600ccctcataat gacaaaatat
cttgctcctg tgtcacctgt agcgaattga gaatggcaac 33660atcaattgac
atgcccttgg ctctaagttc ttctttaagt tctagttgta aaaactctct
33720catattatca ccaaactgct tagccagaag ccccccggga acaagagcag
gggacgctac 33780agtgcagtac aagcgcagac ctccccaatt ggctccagca
aaaacaagat tggaataagc 33840atattgggaa ccaccagtaa tatcatcgaa
gttgctggaa atataatcag gcagagtttc 33900ttgtagaaat tgaataaaag
aaaaatttgc caaaaaaaca ttcaaaacct ctgggatgca 33960aatgcaatag
gttaccgcgc tgcgctccaa cattgttagt tttgaattag tctgcaaaaa
34020taaaaaaaaa acaagcgtca tatcatagta gcctgacgaa caggtggata
aatcagtctt 34080tccatcacaa gacaagccac agggtctcca gctcgaccct
cgtaaaacct gtcatcgtga 34140ttaaacaaca gcaccgaaag ttcctcgcgg
tgaccagcat gaataagtct tgatgaagca 34200tacaatccag acatgttagc
atcagttaag gagaaaaaac agccaacata gcctttgggt 34260ataattatgc
ttaatcgtaa gtatagcaaa gccacccctc gcggatacaa agtaaaaggc
34320acaggagaat aaaaaatata attatttctc tgctgctgtt taggcaacgt
cgcccccggt 34380ccctctaaat acacatacaa agcctcatca gccatggctt
accagagaaa gtacagcggg 34440cacacaaacc acaagctcta aagtcactct
ccaacctstc cacaatatat atacacaagc 34500cctaaactga cgtaatggga
ctaaagtgta aaaaatcccg ccaaacccaa cacacacccc 34560gaaactgcgt
caccagggaa aagtacagtt tcacttccgc aatcccaaca agcgtcactt
34620cctctttctc acggtacgtc acatcccatt aacttacaac gtcattttcc
cacggccgcg 34680ccgccccttt taaccgttaa ccccacagcc aatcaccaca
cggcccacac tttttaaaat 34740cacctcattt acatattggc accattccat
ctataaggta tattattgat gatg
3479445180PRTadenoviridaeSITE(1)..(180)/note="pCC536s E1B-21K
sequence" 45Met Glu Ala Trp Glu Cys Leu Glu Asp Phe Ser Ala Val Arg
Asn Leu 1 5 10 15Leu Glu Gln Ser Ser Asn Ser Thr Ser Trp Phe Trp
Arg Phe Leu Trp 20 25 30Gly Ser Ser Gln Ala Lys Leu Val Cys Arg Ile
Lys Glu Asp Tyr Lys 35 40 45Trp Glu Phe Glu Glu Leu Leu Lys Ser Cys
Gly Glu Leu Phe Asp Ser 50 55 60Leu Asn Leu Gly His Gln Ala Leu Phe
Gln Glu Lys Val Ile Lys Thr 65 70 75 80Leu Asp Phe Ser Thr Pro Gly
Arg Ala Ala Ala Ala Val Ala Phe Leu 85 90 95Ser Phe Ile Lys Asp Lys
Trp Ser Glu Glu Thr His Leu Ser Gly Gly 100 105 110Tyr Leu Leu Asp
Phe Leu Ala Met His Leu Trp Arg Ala Val Val Arg 115 120 125His Lys
Asn Arg Leu Leu Leu Leu Ser Ser Val Arg Pro Ala Ile Ile 130 135
140Pro Thr Glu Glu Gln Gln Gln Gln Gln Glu Glu Ala Arg Arg Arg
Arg145 150 155 160Gln Glu Gln Ser Pro Trp Asn Pro Arg Ala Gly Leu
Asp Pro Pro Val 165 170 175Glu Glu Ala Glu
18046176PRTadenoviridaeSITE(1)..(176)/note="Ad5. E1B-21K sequence"
46Met Glu Ala Trp Glu Cys Leu Glu Asp Phe Ser Ala Val Arg Asn Leu 1
5 10 15Leu Glu Gln Ser Ser Asn Ser Thr Ser Trp Phe Trp Arg Phe Leu
Trp 20 25 30Gly Ser Ser Gln Ala Lys Leu Val Cys Arg Ile Lys Glu Asp
Tyr Lys 35 40 45Trp Glu Phe Glu Glu Leu Leu Lys Ser Cys Gly Glu Leu
Phe Asp Ser 50 55 60Leu Asn Leu Gly His Gln Ala Leu Phe Gln Glu Lys
Val Ile Lys Thr 65 70 75 80Leu Asp Phe Ser Thr Pro Gly Arg Ala Ala
Ala Ala Val Ala Phe Leu 85 90 95Ser Phe Ile Lys Asp Lys Trp Ser Glu
Glu Thr His Leu Ser Gly Gly 100 105 110Tyr Leu Leu Asp Phe Leu Ala
Met His Leu Trp Arg Ala Val Val Arg 115 120 125His Lys Asn Arg Leu
Leu Leu Leu Ser Ser Val Arg Pro Ala Ile Ile 130 135 140Pro Thr Glu
Glu Gln Gln Gln Gln Gln Glu Glu Ala Arg Arg Arg Arg145 150 155
160Gln Glu Gln Ser Pro Trp Asn Pro Arg Ala Gly Leu Asp Pro Arg Glu
165 170 17547180PRTadenoviridaeSITE(1)..(180)/note="Ad35.E1B-21K
sequence" 47Met Glu Val Trp Ala Ile Leu Glu Asp Leu Arg Lys Thr Arg
Gln Leu 1 5 10 15Leu Glu Ser Ala Ser Asp Gly Val Ser Gly Phe Trp
Arg Phe Trp Phe 20 25 30Ala Ser Glu Leu Ala Arg Val Val Phe Arg Ile
Lys Gln Asp Tyr Lys 35 40 45Gln Glu Phe Glu Lys Leu Leu Val Asp Cys
Pro Gly Leu Phe Glu Ala 50 55 60Leu Asn Leu Gly His Gln Val His Phe
Lys Glu Lys Val Leu Ser Val 65 70 75 80Leu Asp Phe Ser Thr Pro Gly
Arg Thr Ala Ala Ala Val Ala Phe Leu 85 90 95Thr Phe Ile Leu Asp Lys
Trp Ile Pro Gln Thr His Phe Ser Arg Gly 100 105 110Tyr Val Leu Asp
Phe Ile Ala Thr Ala Leu Trp Arg Thr Trp Lys Val 115 120 125Arg Lys
Met Arg Thr Ile Leu Gly Tyr Trp Pro Val Gln Pro Leu Gly 130 135
140Val Ala Gly Ile Leu Arg His Pro Pro Val Met Pro Ala Val Leu
Glu145 150 155 160Glu Glu Gln Gln Glu Asp Asn Pro Arg Ala Gly Leu
Asp Pro Pro Val 165 170 175Glu Glu Ala Glu
18048494PRTadenoviridaeSITE(1)..(494)/note="pCC536s E1B-55K
sequence" 48Met Glu Arg Arg Asn Pro Ser Glu Arg Gly Val Pro Ala Gly
Phe Ser 1 5 10 15Gly His Ala Ser Val Glu Ser Gly Cys Glu Thr Gln
Glu Ser Pro Ala 20 25 30Thr Val Val Phe Arg Pro Pro Gly Asp Asn Thr
Asp Gly Gly Ala Ala 35 40 45Ala Ala Ala Gly Gly Ser Gln Ala Ala Ala
Ala Gly Ala Glu Pro Met 50 55 60Glu Pro Glu Ser Arg Pro Gly Pro Ser
Ser Gly Gly Gly Gly Val Ala 65 70 75 80Asp Leu Ser Pro Glu Leu Gln
Arg Val Leu Thr Gly Ser Thr Ser Thr 85 90 95Gly Arg Asp Arg Gly Val
Lys Arg Glu Arg Ala Ser Ser Gly Thr Asp 100 105 110Ala Arg Ser Glu
Leu Ala Leu Ser Leu Met Ser Arg Arg Arg Pro Glu 115 120 125Thr Ile
Trp Trp His Glu Val Gln Lys Glu Gly Arg Asp Glu Val Ser 130 135
140Val Leu Gln Glu Lys Tyr Ser Leu Glu Gln Val Lys Thr Cys Trp
Leu145 150
155 160Glu Pro Glu Asp Asp Trp Ala Val Ala Ile Lys Asn Tyr Ala Lys
Ile 165 170 175Ala Leu Arg Pro Asp Lys Gln Tyr Lys Ile Ser Arg Arg
Ile Asn Ile 180 185 190Arg Asn Ala Cys Tyr Ile Ser Gly Asn Gly Ala
Glu Val Val Ile Asp 195 200 205Thr Gln Asp Lys Thr Val Ile Arg Cys
Cys Met Met Asp Met Trp Pro 210 215 220Gly Val Val Gly Met Glu Ala
Val Thr Phe Val Asn Val Lys Phe Arg225 230 235 240Gly Asp Gly Tyr
Asn Gly Ile Val Phe Met Ala Asn Thr Lys Leu Ile 245 250 255Leu His
Gly Cys Ser Phe Phe Gly Phe Asn Asn Thr Cys Val Asp Ala 260 265
270Trp Gly Gln Val Ser Val Arg Gly Cys Ser Phe Tyr Ala Cys Trp Ile
275 280 285Ala Thr Ala Gly Arg Thr Lys Ser Gln Leu Ser Leu Lys Lys
Cys Ile 290 295 300Phe Gln Arg Cys Asn Leu Gly Ile Leu Asn Glu Gly
Glu Ala Arg Val305 310 315 320Arg His Cys Ala Ser Thr Asp Thr Gly
Cys Phe Ile Leu Ile Lys Gly 325 330 335Asn Ala Ser Val Lys His Asn
Met Ile Cys Gly Ala Ser Asp Glu Arg 340 345 350Pro Tyr Gln Met Leu
Thr Cys Ala Gly Gly His Cys Asn Met Leu Ala 355 360 365Thr Val His
Ile Val Ser His Gln Arg Lys Lys Trp Pro Val Phe Asp 370 375 380His
Asn Val Leu Thr Lys Cys Thr Met His Ala Gly Gly Arg Arg Gly385 390
395 400Met Phe Met Pro Tyr Gln Cys Asn Met Asn His Val Lys Val Leu
Leu 405 410 415Glu Pro Asp Ala Phe Ser Arg Met Ser Leu Thr Gly Ile
Phe Asp Met 420 425 430Asn Thr Gln Ile Trp Lys Ile Leu Arg Tyr Asp
Asp Thr Arg Ser Arg 435 440 445Val Arg Ala Cys Glu Cys Gly Gly Lys
His Ala Arg Phe Gln Pro Val 450 455 460Cys Val Asp Val Thr Glu Asp
Leu Arg Pro Asp His Leu Val Ile Ala465 470 475 480Arg Thr Gly Ala
Glu Phe Gly Ser Ser Gly Glu Glu Thr Asp 485
49049494PRTadenoviridaeSITE(1)..(494)/note="Ad35. E1B-55K sequence"
49Met Asp Pro Ala Asp Ser Phe Gln Gln Gly Ile Arg Phe Gly Phe His 1
5 10 15Ser His Ser Ile Val Glu Asn Met Glu Gly Ser Gln Asp Glu Asp
Asn 20 25 30Leu Arg Leu Leu Ala Ser Ala Ala Phe Gly Cys Ser Gly Asn
Pro Glu 35 40 45Ala Ser Thr Gly His Ala Ser Gly Ser Gly Gly Gly Thr
Ala Arg Gly 50 55 60Gln Pro Glu Ser Arg Pro Gly Pro Ser Ser Gly Gly
Gly Gly Val Ala 65 70 75 80Asp Leu Ser Pro Glu Leu Gln Arg Val Leu
Thr Gly Ser Thr Ser Thr 85 90 95Gly Arg Asp Arg Gly Val Lys Arg Glu
Arg Ala Ser Ser Gly Thr Asp 100 105 110Ala Arg Ser Glu Leu Ala Leu
Ser Leu Met Ser Arg Arg Arg Pro Glu 115 120 125Thr Ile Trp Trp His
Glu Val Gln Lys Glu Gly Arg Asp Glu Val Ser 130 135 140Val Leu Gln
Glu Lys Tyr Ser Leu Glu Gln Val Lys Thr Cys Trp Leu145 150 155
160Glu Pro Glu Asp Asp Trp Ala Val Ala Ile Lys Asn Tyr Ala Lys Ile
165 170 175Ala Leu Arg Pro Asp Lys Gln Tyr Lys Ile Ser Arg Arg Ile
Asn Ile 180 185 190Arg Asn Ala Cys Tyr Ile Ser Gly Asn Gly Ala Glu
Val Val Ile Asp 195 200 205Thr Gln Asp Lys Thr Val Ile Arg Cys Cys
Met Met Asp Met Trp Pro 210 215 220Gly Val Val Gly Met Glu Ala Val
Thr Phe Val Asn Val Lys Phe Arg225 230 235 240Gly Asp Gly Tyr Asn
Gly Ile Val Phe Met Ala Asn Thr Lys Leu Ile 245 250 255Leu His Gly
Cys Ser Phe Phe Gly Phe Asn Asn Thr Cys Val Asp Ala 260 265 270Trp
Gly Gln Val Ser Val Arg Gly Cys Ser Phe Tyr Ala Cys Trp Ile 275 280
285Ala Thr Ala Gly Arg Thr Lys Ser Gln Leu Ser Leu Lys Lys Cys Ile
290 295 300Phe Gln Arg Cys Asn Leu Gly Ile Leu Asn Glu Gly Glu Ala
Arg Val305 310 315 320Arg His Cys Ala Ser Thr Asp Thr Gly Cys Phe
Ile Leu Ile Lys Gly 325 330 335Asn Ala Ser Val Lys His Asn Met Ile
Cys Gly Ala Ser Asp Glu Arg 340 345 350Pro Tyr Gln Met Leu Thr Cys
Ala Gly Gly His Cys Asn Met Leu Ala 355 360 365Thr Val His Ile Val
Ser His Gln Arg Lys Lys Trp Pro Val Phe Asp 370 375 380His Asn Val
Leu Thr Lys Cys Thr Met His Ala Gly Gly Arg Arg Gly385 390 395
400Met Phe Met Pro Tyr Gln Cys Asn Met Asn His Val Lys Val Leu Leu
405 410 415Glu Pro Asp Ala Phe Ser Arg Met Ser Leu Thr Gly Ile Phe
Asp Met 420 425 430Asn Thr Gln Ile Trp Lys Ile Leu Arg Tyr Asp Asp
Thr Arg Ser Arg 435 440 445Val Arg Ala Cys Glu Cys Gly Gly Lys His
Ala Arg Phe Gln Pro Val 450 455 460Cys Val Asp Val Thr Glu Asp Leu
Arg Pro Asp His Leu Val Ile Ala465 470 475 480Arg Thr Gly Ala Glu
Phe Gly Ser Ser Gly Glu Glu Thr Asp 485
49050496PRTadenoviridaeSITE(1)..(496)/note="Ad5. E1B-55K sequence"
50Met Glu Arg Arg Asn Pro Ser Glu Arg Gly Val Pro Ala Gly Phe Ser 1
5 10 15Gly His Ala Ser Val Glu Ser Gly Cys Glu Thr Gln Glu Ser Pro
Ala 20 25 30Thr Val Val Phe Arg Pro Pro Gly Asp Asn Thr Asp Gly Gly
Ala Ala 35 40 45Ala Ala Ala Gly Gly Ser Gln Ala Ala Ala Ala Gly Ala
Glu Pro Met 50 55 60Glu Pro Glu Ser Arg Pro Gly Pro Ser Gly Met Asn
Val Val Gln Val 65 70 75 80Ala Glu Leu Tyr Pro Glu Leu Arg Arg Ile
Leu Thr Ile Thr Glu Asp 85 90 95Gly Gln Gly Leu Lys Gly Val Lys Arg
Glu Arg Gly Ala Cys Glu Ala 100 105 110Thr Glu Glu Ala Arg Asn Leu
Ala Phe Ser Leu Met Thr Arg His Arg 115 120 125Pro Glu Cys Ile Thr
Phe Gln Gln Ile Lys Asp Asn Cys Ala Asn Glu 130 135 140Leu Asp Leu
Leu Ala Gln Lys Tyr Ser Ile Glu Gln Leu Thr Thr Tyr145 150 155
160Trp Leu Gln Pro Gly Asp Asp Phe Glu Glu Ala Ile Arg Val Tyr Ala
165 170 175Lys Val Ala Leu Arg Pro Asp Cys Lys Tyr Lys Ile Ser Lys
Leu Val 180 185 190Asn Ile Arg Asn Cys Cys Tyr Ile Ser Gly Asn Gly
Ala Glu Val Glu 195 200 205Ile Asp Thr Glu Asp Arg Val Ala Phe Arg
Cys Ser Met Ile Asn Met 210 215 220Trp Pro Gly Val Leu Gly Met Asp
Gly Val Val Ile Met Asn Val Arg225 230 235 240Phe Thr Gly Pro Asn
Phe Ser Gly Thr Val Phe Leu Ala Asn Thr Asn 245 250 255Leu Ile Leu
His Gly Val Ser Phe Tyr Gly Phe Asn Asn Thr Cys Val 260 265 270Glu
Ala Trp Thr Asp Val Arg Val Arg Gly Cys Ala Phe Tyr Cys Cys 275 280
285Trp Lys Gly Val Val Cys Arg Pro Lys Ser Arg Ala Ser Ile Lys Lys
290 295 300Cys Leu Phe Glu Arg Cys Thr Leu Gly Ile Leu Ser Glu Gly
Asn Ser305 310 315 320Arg Val Arg His Asn Val Ala Ser Asp Cys Gly
Cys Phe Met Leu Val 325 330 335Lys Ser Val Ala Val Ile Lys His Asn
Met Val Cys Gly Asn Cys Glu 340 345 350Asp Arg Ala Ser Gln Met Leu
Thr Cys Ser Asp Gly Asn Cys His Leu 355 360 365Leu Lys Thr Ile His
Val Ala Ser His Ser Arg Lys Ala Trp Pro Val 370 375 380Phe Glu His
Asn Ile Leu Thr Arg Cys Ser Leu His Leu Gly Asn Arg385 390 395
400Arg Gly Val Phe Leu Pro Tyr Gln Cys Asn Leu Ser His Thr Lys Ile
405 410 415Leu Leu Glu Pro Glu Ser Met Ser Lys Val Asn Leu Asn Gly
Val Phe 420 425 430Asp Met Thr Met Lys Ile Trp Lys Val Leu Arg Tyr
Asp Glu Thr Arg 435 440 445Thr Arg Cys Arg Pro Cys Glu Cys Gly Gly
Lys His Ile Arg Asn Gln 450 455 460Pro Val Met Leu Asp Val Thr Glu
Glu Leu Arg Pro Asp His Leu Val465 470 475 480Leu Ala Cys Thr Arg
Ala Glu Phe Gly Ser Ser Asp Glu Asp Thr Asp 485 490 495
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