U.S. patent application number 13/906475 was filed with the patent office on 2013-12-05 for method for highly sensitive detection of protein-protein interaction.
This patent application is currently assigned to The University of Tokyo. The applicant listed for this patent is ProbeX Inc., Toyo Boseki Kabushiki Kaisha, The University of Tokyo. Invention is credited to Kenji MASUDA, Naomi MISAWA, Kenji MIURA, Shigeaki NISHII, Tasuku OKAMOTO, Takeaki OZAWA.
Application Number | 20130323814 13/906475 |
Document ID | / |
Family ID | 43222819 |
Filed Date | 2013-12-05 |
United States Patent
Application |
20130323814 |
Kind Code |
A1 |
OZAWA; Takeaki ; et
al. |
December 5, 2013 |
METHOD FOR HIGHLY SENSITIVE DETECTION OF PROTEIN-PROTEIN
INTERACTION
Abstract
The present invention intends to provide an assay system using
split luciferase that has a remarkably high detection sensitivity.
In an embodiment, binding of mutually binding first and second
proteins is detected by preparing a first fusion protein comprising
the first protein fused with a peptide having the amino acid
sequence of amino acid SEQ ID NO: 1 and a second fusion protein
comprising the second protein fused with a peptide having an amino
acid sequence selected from the group consisting of amino acid SEQ
ID NOS: 2 to 6, and allowing the first fusion protein to bind with
the second fusion protein to form a complex, and detecting
luminescence emitted from the complex.
Inventors: |
OZAWA; Takeaki; (Tokyo,
JP) ; MISAWA; Naomi; (Tokyo, JP) ; MIURA;
Kenji; (Tokyo, JP) ; OKAMOTO; Tasuku; (Tokyo,
JP) ; NISHII; Shigeaki; (Tokyo, JP) ; MASUDA;
Kenji; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
The University of Tokyo;
ProbeX Inc.;
Toyo Boseki Kabushiki Kaisha; |
|
|
US
US
US |
|
|
Assignee: |
The University of Tokyo
Tokyo
JP
Toyo Boseki Kabushiki Kaisha
Osaka
JP
ProbeX Inc.
Tokyo
JP
|
Family ID: |
43222819 |
Appl. No.: |
13/906475 |
Filed: |
May 31, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13375142 |
Apr 12, 2012 |
8470974 |
|
|
PCT/JP2010/059160 |
May 28, 2010 |
|
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13906475 |
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Current U.S.
Class: |
435/189 |
Current CPC
Class: |
C12N 9/0069 20130101;
G01N 33/542 20130101; C12Q 1/66 20130101; C12Q 1/6804 20130101 |
Class at
Publication: |
435/189 |
International
Class: |
C12N 9/02 20060101
C12N009/02 |
Foreign Application Data
Date |
Code |
Application Number |
May 29, 2009 |
JP |
2009-131481 |
Feb 23, 2010 |
JP |
2010-037921 |
Claims
1. A fusion protein having the amino acid sequence of amino acid
SEQ ID No: 1.
2-13. (canceled)
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This invention claims priority on Japanese Patent
Application No. 2009-131481 filed on May 29, 2009 and Japanese
Patent Application No. 2010-37921 filed on Feb. 23, 2010, which are
herein incorporated by reference.
TECHNICAL FIELD
[0002] This invention relates to methods for detecting a
protein-protein interaction.
BACKGROUND ART
[0003] A method for detecting protein interaction between two
target proteins by using complementarity of split luciferase
fragments has been recently developed (Kim, S. B., Ozawa, T.,
Watanabe, S., Umezawa, Y., 2004. Proc. Natl. Acad. Sci. USA. 101,
11542-11547). The method for detecting a protein-protein
interaction using complementarity is generally conducted by fusing
fragments of a split reporter protein respectively with the target
proteins, and in this process, each fragment does not have
significant activity by itself. When the target proteins interact
with each other, the inactive reporter protein fragments complement
with each other to regain the activity which allows emission of the
signal to enable indirect tracking of the protein-protein
interaction.
[0004] Such method using the complementarity has been used for
various reporter proteins such as dihydrofolate reductase and
.beta.-lactamase green fluorescent protein. Also, several
luciferases such as Renilla reniformis luciferase, Photinus Pyralis
luciferase, red-emitting Photinus Pyralis luciferase, and
green-emitting Photinus Pyralis luciferase have been used.
SUMMARY OF INVENTION
Technical Problem
[0005] An object of the present invention is to provide an assay
system using split luciferase which has remarkably high detection
sensitivity.
Solution to Problem
[0006] The inventors of the present invention made an intensive
study for solving the problem as described above, and found that,
when using luciferase from Brazilian larval click-beetle
(Pyrearinus termitilluminans), a C terminal fragment having SEQ ID
NO: 1 and an N terminal fragment having any one of SEQ ID NOS: 2 to
6 are fused with each of the two interacting proteins respectively,
and the two fusion proteins are bound, a luminescence with an
intensity about 30 fold stronger than the conventional assay is
emitted. The present invention has been completed on the bases of
such a finding.
[0007] Accordingly, one aspect of the present invention is a fusion
protein having the amino acid sequence of amino acid SEQ ID NO: 1.
Another aspect of the present invention is a fusion protein having
an amino acid sequence selected from the group consisting of amino
acid SEQ ID NOS: 2 to 6.
[0008] In the present specification, the "protein has an amino acid
sequence" means that the protein contains the amino acid sequence
and that the protein may contain an amino acid sequence other than
such an amino acid sequence. The "fusion protein" means a peptide
derived from Pyrearinus termitilluminans luciferase (which, in the
present invention, is a peptide consisting of an amino acid
sequence selected from the group consisting of amino acid SEQ ID
NO: 1 to 6) fused with a peptide not derived from Pyrearinus
termitilluminans luciferase.
[0009] A further aspect of the invention is a complex of a fusion
protein having the amino acid sequence of amino acid SEQ ID NO: 1
and a fusion protein having an amino acid sequence selected from
the group consisting of amino acid SEQ ID NOS: 2 to 6.
[0010] A still further aspect of the invention is a DNA coding for
an amino acid sequence selected from the group consisting of amino
acid SEQ ID NOS: 1 to 6, or maybe an expression vector that
contains this DNA and is capable of expressing a fusion protein
having an amino acid sequence selected from the group consisting of
amino acid SEQ ID NOS: 1 to 6.
[0011] A still further aspect of the invention is a kit for
detecting protein-protein interaction containing an expression
vector for expressing a protein having a peptide comprising the
amino acid sequence of amino acid SEQ ID NO: 1 and an expression
vector for expressing a protein having a peptide comprising an
amino acid sequence selected from the group consisting of amino
acid SEQ ID NOS: 2 to 6.
[0012] A still further aspect of the invention is a method for
detecting a fusion protein having the amino acid sequence of amino
acid SEQ ID NO: 1, comprising the steps of allowing the fusion
protein to interact with a binding fusion protein wherein the
binding fusion protein has an amino acid sequence selected from the
group consisting of amino acid SEQ ID NOS: 2 to 6 and is capable of
binding with the fusion protein, to allow formation of a complex,
and detecting luminescence emitted from the complex.
[0013] A still further aspect of the invention is a method for
detecting a fusion protein containing an amino acid sequence
selected from the group consisting of amino acid SEQ ID NOS: 2 to
6, comprising the steps of allowing the fusion protein to interact
with a binding fusion protein wherein the binding fusion protein
has the amino acid sequence of amino acid SEQ ID NO: 1 and is
capable of binding with the fusion protein, to form a complex, and
detecting luminescence emitted from the complex.
[0014] A still further aspect of the invention is a method for
detecting a complex of a first fusion protein and a binding fusion
protein being capable of binding with the first fusion protein,
comprising the step of detecting luminescence emitted from the
complex, wherein the first fusion protein has the amino acid
sequence of amino acid SEQ ID NO: 1 and the binding fusion protein
has an amino acid sequence selected from the group consisting of
amino acid SEQ ID NOS: 2 to 6.
[0015] A still further aspect of the invention is a method for
detecting binding of first and second fusion proteins which are
bound to each other, wherein the first fusion protein has the amino
acid sequence of amino acid SEQ ID NO: 1 and the second fusion
protein has an amino acid sequence selected from the group
consisting of amino acid SEQ ID NOS: 2 to 6, comprising the steps
of allowing the first fusion protein to interact with the second
fusion protein to allow formation of a complex, and detecting
luminescence emitted from the complex. This method may further
comprise the steps of fusing the amino acid sequence of amino acid
SEQ ID NO: 1 with a first protein to prepare the first fusion
protein, and fusing an amino acid sequence selected from the group
consisting of amino acid SEQ ID NOS: 2 to 6 with a second protein
to prepare the second fusion protein.
[0016] A still further aspect of the invention is a method for
screening a fusion protein library for a binding fusion protein
being capable of binding to a first fusion protein, comprising the
steps of allowing the first fusion protein to interact with a
plurality of second fusion proteins, wherein the first fusion
protein has the amino acid sequence of amino acid SEQ ID NO: 1 and
the second fusion proteins have an amino acid sequence selected
from the group consisting of amino acid SEQ ID NOS: 2 to 6 and are
in the fusion protein library, and identifying the binding fusion
protein that forms a complex with the first fusion protein by
detecting luminescence emitted by the complex.
[0017] A still further aspect of the invention is a method for
screening for a binding fusion protein being capable of binding
with a first fusion protein comprising the steps of allowing the
first fusion protein to interact with a plurality of second fusion
proteins, wherein the first fusion protein has an amino acid
sequence selected from the group consisting of amino acid SEQ ID
NOS: 2 to 6, and the second fusion proteins have the amino acid
sequence of amino acid SEQ ID NO: 1, and identifying the binding
fusion protein that forms a complex with the first fusion protein
detecting luminescence emitted from the complex.
BRIEF DESCRIPTION OF DRAWINGS
[0018] [FIG. 1-1] FIG. 1A is the nucleotide sequence of the cDNA of
Pyrearinus termitilluminans luciferase.
[0019] [FIG. 1-2] FIG. 1B is a list of PCR primers used in
preparing plucN and plucC in one example of the present
invention.
[0020] [FIG. 1-3] FIG. 1C is the nucleotide sequence of the DNA
inserted in multicloning site of pcDNA3.1 in
pcDNA3.1/myc-His(B).
[0021] [FIG. 1-4] FIG. 1D is the nucleotide sequence of the DNA
inserted in multicloning site of pcDNA4 in pcDNA4/V5-His(B).
[0022] [FIG. 2-1] FIG. 2-1 is graphs showing the results of the
luminescence intensity measurement in a luciferase split assay in
one Example of the present invention, which were obtained by using
combinations of pFRB-lucC389 to pFRB-lucC391 and plucN404-FKBP to
plucN417-FKBP. For each sample, the left bar of the bar graph is
the result for the rapamycin-containing culture medium, and the
right bar is the result for the DMSO-containing culture medium.
[0023] [FIG. 2-2] FIG. 2-2 is graphs showing the results of the
luminescence intensity measurement in a luciferase split assay in
one Example of the present invention, which were obtained by using
combinations of pFRB-lucC392 to pFRB-lucC394 and plucN404-FKBP to
plucN417-RKBP. For each sample in the bar graph, the left bar is
the result for the rapamycin-containing culture medium, and the
right bar is the result for the DMSO-containing culture medium.
[0024] [FIG. 3-1] FIG. 3-1 is graphs showing the results of the
luminescence intensity measurement in a luciferase split assay in
one Example of the present invention, which were obtained by using
combinations of pFRB-lucC394 to pFRB-lucC399 and plucN404-FKBP to
plucN417-FKBP. For each sample in the bar graph, the left bar is
the result for the rapamycin-containing culture medium, and the
right bar is the result for the DMSO-containing culture medium.
[0025] [FIG. 3-2] FIG. 3-2 is graphs showing the results of the
luminescence intensity measurement in a luciferase split assay in
one Example of the present invention, which were obtained by using
combinations of pFRB-lucC400 to pFRB-lucC403 and plucN404-FKBP to
plucN417-FKBP. For each sample in the bar graph, the left bar is
the result for the rapamycin-containing culture medium, and the
right bar is the result for the DMSO-containing culture medium.
[0026] [FIG. 3-3] FIG. 3-3 is graphs showing the results of the
luminescence intensity measurement in a luciferase split assay in
one Example of the present invention, which were obtained by using
combinations of pFRB-lucC404 to pFRB-lucC407 and plucN404-FKBP to
plucN417-FKBP. For each sample in the bar graph, the left bar is
the result for the rapamycin-containing culture medium, and the
right bar is the result for the DMSO-containing culture medium.
[0027] [FIG. 4] FIG. 4 is a graph and a table showing the results
of the luminescence intensity measurement in a luciferase split
assay in one Example of the present invention, which were obtained
by using combinations of pFRB-lucC394 and plucN412-FKBP to
plucN416-FKBP. In the table, Rap+ is the luminescence intensity
when binding was induced; DMSO is the luminescence intensity when
binding was not induced (namely, the background); STDEV-R is the
standard deviation when binding was induced with Rap+; and STDEV-D
is the standard deviation when binding was not induced with DMSO.
For each sample in the graph, the left bar is the result for the
rapamycin-containing culture medium, and the right bar is the
result for the DMSO-containing culture medium.
[0028] [FIG. 5] FIG. 5 is a table showing the results of the
luminescence intensity measurement in a luciferase split assay in
one Example of the present invention, which were obtained by using
combination of plucN415-FKBP and pFRB-lucC394 and conventional
combination of pTlucN-FKBP and pFRB-GlucC. Symbols are as defined
above for FIG. 4.
[0029] [FIG. 6] FIG. 6 is a graph showing the results of the
comparison of the luminescence intensity, in one Example of the
present invention, for the cases when somatostatin was added and
not added to HEK293 cells in which pSSTR2-lucC394 and
plucN415-arrestin had been introduced to transiently express
SSTR2-lucC394 and lucN415-arrestin, respectively. x axis shows
presence (+) and absence (-) of the somatostatin, and y axis shows
number of photons (.times.10.sup.4).
[0030] [FIG. 7] FIG. 7 is a graph showing dose-response curves in
one Example of the present invention, when HEK293-ARRB2-SSTR2 cell
line was stimulated with somatostatin or its analogs (RIM23052 or
BIM23056) at various concentrations. x axis shows concentration of
each reagent (log [molar concentration]), and y axis shows number
of photons (.times.10.sup.4).
[0031] [FIG. 8] FIG. 8 is a graph showing a time-response curve in
one Example of the present invention, when HEK293-ARRB2-SSTR2 cell
line was stimulated with 1.times.10.sup.-6 M of somatostatin, and
luminescence was measured with time. x axis shows time (min), and y
axis shows number of photons (.times.10.sup.4).
[0032] [FIG. 9] FIG. 9 is a table showing names of the GPCRs used,
PCR templates and primer sequences used in preparing the expression
vectors for expressing fusion proteins, ligands used for the
stimulation, ligand concentrations (EC50) at which the luminescence
was detected (unit: molar concentration), and the times (T) of the
maximum luminescence observation after the stimulation, in the
experiment conducted for the GPCRs.
DESCRIPTION OF EMBODIMENTS
[0033] Next, embodiments of the present invention completed based
on the finding as described above are described in detail by
referring to Examples. Unless otherwise noted, methods described in
standard protocols such as J. Sambrook, E. F. Fritsch & T.
Maniatis (Ed.), Molecular cloning, a laboratory manual (3rd
edition), Cold Spring Harbor Press, Cold Spring Harbor, New York
(2001); F. M. Ausubel, R. Brent, R. E. Kingston, D. D. Moore, J. G.
Seidman, J. A. Smith, K. Struhl (Ed.), Current Protocols in
Molecular Biology, John Wiley & Sons Ltd. as well as their
modifications and improvements are used in the embodiments and
Examples. When commercially available reagent, kit and assay
apparatus are used, protocols attached thereto are used unless
otherwise noted.
[0034] The objects, features, advantages, and ideas of the present
invention are clear for those skilled in the art from the
description of the invention, and those skilled in the art will be
readily capable of reproducing the invention. The embodiments and
Examples as described below are preferable embodiments of the
present invention, which are presented for the purpose of
illustration and explanation, and the present invention is not
limited by these embodiments and Examples. It is clear for those
skilled in the art that the description of the present invention
can be modified in various ways within the scope and intention of
the invention herein described.
[Principle]
[0035] The present invention provides a luciferase split assay
system with a high detection sensitivity. In this assay system, an
amino acid sequence comprising amino acid SEQ ID NO: 1 and an amino
acid sequence selected from the group consisting of amino acid SEQ
ID NOS: 2 to 6 from Pyrearinus termitilluminans luciferase whose
sequence is described in FIG. 1A, are used. Next, methods using
this assay system are described in detail. The luciferase split
assay is a technique known in the art, and the procedure not
described in this specification may be conducted according to
common knowledge of those skilled in the art.
[0036] First, a first protein (referred to as a first fusion
protein) having the amino acid sequence of amino acid SEQ ID NO: 1
(this peptide moiety is referred to as lucCmax) and a second
protein (referred to as a second fusion protein) having an amino
acid sequence (this peptide moiety is referred to as lucNmax)
selected from the group consisting of amino acid SEQ ID NOS: 2 to 6
are synthesized. It should be noted that the first protein and the
second protein can bind to each other under particular
conditions.
[0037] While the fusion proteins can be chemically synthesized for
use in the assay system, the fusion proteins maybe provided by
constructing expression vectors coding for the fusion proteins and
expressing the fusion proteins in the assay system, as will be
described below. In such a case, the fusion proteins maybe
expressed either transiently or permanently. The former is
preferable when the assay system is an in vitro system, and the
latter is preferable when the assay system is an in vivo system
such as a cell. In each fusion protein, the lucCmax or the lucNmax
may be connected to the protein either directly or via a linker.
The linker is preferably a peptide moiety with an adequate
length.
[0038] When both of the fusion proteins are introduced in the assay
system, the first protein and the second protein bind to each
other, and as a consequence, the lucCmax and the lucNmax will be
located at positions capable of undergoing an interaction, and the
lucCmax and the lucNmax will reconstitute the luciferase to recover
luciferase activity so that the luciferase is capable of emitting
light under adequate luminescent conditions. The luciferase
activity may be measured, when the assay system is a cell, by
adding luciferin to the cell culture, and preparing a cell extract
to measure the luciferase activity. In this case, the activity is
readily measurable by using a commercially available Emerald Luc
Luciferase Assay Reagent/Lysis Solution (TOYOBO) or the like.
[0039] In this assay system, a luminescence intensity that is about
30 times or more stronger than the conventional assay is realized
when the amino acid sequence of the lucC is amino acid SEQ ID NO: 1
and the amino acid sequence of the lucN is an amino acid sequence
selected from the group consisting of amino acid SEQ ID NOS: 2 to
6.
[Construction of Expression Vectors]
[0040] As described above, the introduction of the fusion proteins
into the assay system can be realized by constructing expression
vectors coding for the fusion proteins and expressing the fusion
proteins in the assay system.
[0041] The expression vectors coding for the fusion proteins can be
readily constructed by constructing vectors containing DNA coding
for the amino acid sequence selected from the group consisting of
amino acid SEQ ID NO: 1 to 6 in advance.
[0042] For example, such a vector may be constructed to have DNA
coding for the lucNmax having the initiation codon ATG inserted
downstream of an expression promoter which can function in the
assay system and followed by a multicloning site immediately
downstream and a transcription termination signal further
downstream. When DNA coding for the intended protein is inserted in
frame in the multicloning site, expression of the fusion protein of
the lucNmax and the intended protein is facilitated.
[0043] Another exemplary vector has a form comprising an expression
promoter that can function in the assay system, the initiation
codon ATG, DNA coding for the multicloning site and the lucCmax,
and the transcription termination signal in this order. When DNA
coding for the intended protein is inserted in frame in the
multicloning site, expression of the fusion protein of the lucCmax
and the intended protein is facilitated.
[0044] Furthermore, an expression vector for the fusion protein
having lucCmax or lucNmax can be readily constructed for the
purpose of, for example, detecting a protein-protein interaction
when a kit containing a vector having DNA coding for the amino acid
sequence of the amino acid SEQ ID NO: 1, namely, the lucCmax and a
vector having DNA coding for an amino acid sequence selected from
the group consisting of amino acid SEQ ID NOS: 2 to 6, namely, the
lucNmax is prepared.
[Use of the Assay System]
[0045] Next, exemplary uses of the assay system of the present
invention are described.
[0046] First of all, a fusion protein having lucCmax can be
detected. For example, when a first fusion protein that has been
made by fusing a target protein to be detected with lucCmax exists
in the assay system, a second fusion protein that has been made by
fusing a binding protein that binds to the target protein with
lucNmax is prepared as a probe and is introduced in the assay
system. Then, the binding protein in the second fusion protein
should bind to the target protein in the first fusion protein;
thereby the lucCmax and the lucNmax interact and gain luciferase
activity. By detecting the luciferase activity, the target fusion
protein having the lucCmax can be detected. Specifically, an
expression vector expressing the first fusion protein is prepared
and introduced in a cell. Next, an expression vector expressing the
second fusion protein is prepared and introduced in the cell
expressing the first fusion protein. Then the fusion protein having
the lucCmax is detected by measuring the luciferase activity as
described above.
[0047] Next, a fusion protein having lucNmax can be detected. For
example, if a first fusion protein that has been made by fusing the
target protein to be detected with lucNmax exists in the assay
system, a second fusion protein that has been made by fusing a
binding peptide that binds to the target protein with lucCmax is
prepared as a probe and is introduced in the assay system. Then,
the binding peptide in the second fusion protein will bind to the
target peptide in the first fusion protein; thereby the lucNmax and
the lucCmax interat and gain luciferase activity. By detecting the
luciferase activity, the target fusion protein having the lucNmax
can be detected. Specifically, an expression vector expressing the
first fusion protein is prepared and introduced in a cell. Next, an
expression vector expressing the second fusion protein is prepared,
and introduced in the cell expressing the first fusion protein.
Then the fusion protein having the lucNmax is detected by measuring
the luciferase activity as described above.
[0048] Further, a complex of a fusion protein having the lucNmax
and a fusion protein having the lucCmax can be detected. When these
fusion proteins form a complex, the lucNmax and the lucCmax
interact and gain luciferase activity. By detecting the luciferase
activity, the complex can be detected. For detection, the assay
system including the complex may be placed under the conditions
wherein the luciferase activity can be detected. When the assay
system is a cell, the luciferase activity may be measured by the
procedure as described above.
[0049] Further, binding of the first and second proteins that have
mutual binding ability can be detected, because a first fusion
protein and a second fusion protein are synthesized by fusing a
first protein and a second protein with the lucNmax and the lucCmax
in advance respectively so that the luciferase activity will be
detectable if the first fusion protein binds to the second fusion
protein. It can be examined whether the first protein can bind to
the second protein by using this method; when the first fusion
protein prepared by fusing the lucNmax with the first protein and
the second fusion protein prepared by fusing the lucCmax with the
second peptide are introduced in the assay system, the luciferase
activity will be detected if the first protein binds with the
second protein and the luciferase activity will not be detected if
the first protein does not bind with the second protein.
Specifically, expression vectors expressing the first fusion
protein or the second fusion protein are separately prepared and
both of them are introduced in the same cell, and then, if
luminescence from the luciferase reconstituted in the cell is
observed by measuring the luciferase activity as described above,
the first protein and the second protein can be judged to be bound
each other, and the first protein and the second protein can be
judged not to be bound if no luminescence is detected.
[0050] Further, it is possible to screen a protein library for a
binding protein that is capable of binding to a first protein. More
specifically, a first fusion protein is prepared by fusing a first
protein with lucNmax or lucCmax, and second fusion proteins are
prepared by fusing second proteins in the protein library with
lucCmax or lucNmax, respectively; and when the first fusion protein
and the second fusion proteins are allowed to interact with each
other, only the second fusion proteins having the binding proteins
capable of binding with the first protein form complexes with the
first fusion protein. Accordingly, the second proteins that bind to
the first protein can be identified by detecting luminescence
emitted from the complexes. Specifically, a cell transformed with
an expression vector which expresses a first fusion protein
comprising a first protein fused with lucNmax is prepared, and a
cDNA library which has been constructed to express proteins in the
form fused with lucCmax is introduced in the cell; then, luciferin
is added to the culture medium, and luminescent cells are
identified and cloned. DNAs derived from the library are recovered
from the clones, and the genes expressed are identified to thereby
obtain cDNAs of the second proteins that form the complexes with
the first protein.
EXAMPLES
Example 1
[0051] In this Example, interacting proteins, FKBP
(NM.sub.--054014) and FRB (NM.sub.--019906), which are bound each
other in the presence of rapamycin, were fused with lucNs, peptides
having the N terminal sequence of Pyrearinus termitilluminans
luciferase and lucCs, peptides having the C terminal sequence of
Pyrearinus termitilluminans luciferase, respectively. It will be
shown that the luminescence activity of the complex of the
interacting proteins varies according to the combination of lucN
and lucC, and is remarkably enhanced when lucNmax (SEQ ID NO: 2 to
6; the amino acid sequence of 1st-412nd to 416th amino acid
residues) is used in combination with lucCmax (SEQ ID NO: 1; the
amino acid sequence of 394th-542nd amino acid residues).
[0052] First, PCR was conducted using a cDNA of Pyrearinus
termitilluminans luciferase, whose sequence is shown in FIG. 1A, as
template and using the primers of FIG. 1R to obtain 14 kinds of DNA
fragments coding for 14 kinds of peptide each having an amino acid
sequence from N terminal amino acid residue to the 404th to 417th
amino acid residues, which were obtained by using the pair of
N-PtGR-F001 and N-PtGR-R404 to R417, and 25 kinds of DNA fragments
coding for amino acid sequences from C terminal amino acid residue
to the 389th to 413rd amino acid residues, which were obtained by
using C-PtGR-R542 and C-PtGR-F389 to F413. The DNA coding for the N
terminal region was cleaved with HindIII and BamHI, pFKBP was
cleaved with BamHI and XhoI, and pcDNA3.1/myc-His (B) was cleaved
with HindIII and XhoI to conduct three molecule ligation and thus
14 kinds of plucN-FKBP were prepared. In the meanwhile, the DNA
coding for the C terminal region was cleaved with XhoI and SacII,
pFRB was cleaved with BamHI and XhoI, and pcDNA4/V5-His (B) was
cleaved with BamHI and SacII to conduct three molecule ligation and
thus 25 kinds of pFRB-lucC were prepared. pcDNA3.1/myc-His (B) and
pcDNA4/V5-His(B) are plasmid vectors having the sequence of
SEQUENCE ID NOS: 7 and 8 inserted therein, respectively. The
nucleotide sequence of the DNA inserted in the multicloning site of
pcDNA3.1 is shown in FIG. 1C and the nucleotide sequence of the DNA
inserted in the multicloning site of pcDNA4 is shown in FIG.
1D.
[0053] For the 339 cases where the luciferase was reconstructed as
the amino acid sequence of the original luciferase (overlapping of
the amino acid: 0), or with partial overlapping (overlapping of the
amino acid: 1 or more) in the combinations of 14 kinds of
plucN-FKBP and 25 kinds of pFRB-lucC, each pair of the expression
vectors was transfected to COS7 cells on a 96 well plastic culture
dish using TtansIT Transfection Reagents (TAKARA). After about 16
hours from the transfection, the culture medium was replaced with
the medium containing 1 .mu.m of rapamycin; after 24 hours of
incubation, ELA (TOYOBO) was added and the luminescence was
measured by TriStar LB941 (Berthold Technologies).
[0054] As shown in FIGS. 2 and 3, high levels of signal were
obtained for pFRB-lucC394, and the signal was the highest in the
case of plucN412-FKBP to plucN416-FKBP. It should be noted that
almost no signal was obtained for pFRB-lucC408 to pFRB-lucC413, and
these cases are not shown in the drawings. Further, in FIG. 3, no
signal was obtained in the case of plucN415-FKBP due to the
experimental failure.
[0055] Accordingly, the experiment was conducted again for
plucN412-FKBP to plucN416-FKBP, and as shown in FIG. 4, the highest
signals were obtained for plucN412-FKBP to plucN416-FKBP at almost
the same level.
[0056] The luminescence intensity obtained by using the combination
of plucN415-FKBP and pFRB-lucC394 which was shown to be the most
suitable was compared with the luminescence intensity obtained by
the combination of pTlucN-FKBP and pFRB-GlucC which had been
accepted as the most suitable combination. pTlucN-FKBP is a vector
constructed by amplifying an N terminal fragment of the cDNA of
red-emitting Photinus Pyralis luciferase by PCR using the primers
as shown below and constructing the vector in the same manner as
plucN-FKBP, and pFRB-GlucC is a vector constructed by amplifying a
C terminal fragment of the cDNA of green-emitting Photinus Pyralis
luciferase by PCR using the primers as shown below and constructing
the vector in the same manner as pFRB-lucC.
TABLE-US-00001 (TlucN-1) (SEQ ID No. 9)
5'AAGCTTGCCATGGTAAAGCGTGAGAAAAATGTC 3' (TlucN-2) (SEQ ID No. 10)
5'GGATCCTCCGCCTCCTCCGCCGTCGTCGATGGCCTC 3' (GlucC-1) (SEQ ID No. 11)
5'aggCTCGAGTGGAGGCGGCGGAGGCTGGCTGCACTCTGGCGACTTC 3' (GlucC-2) (SEQ
ID No. 12) 5'cgcGGGCCCAGCTTAGAAGCCTTCTCCATCAGGGC 3'
[0057] As shown in FIG. 5, the luminescence intensity obtained by
the combination of plucN415-FKBP and pFRB-lucC394 was about 30 fold
higher than the conventional combination of plucN415-FKBP and
pFRB-lucC394. Thus, the luminescence intensity about 30 fold higher
than the conventional luminescence intensity was realized by using
the Pyrearinus termitilluminans luciferase and conducting the
luciferase split assay by using the C terminal fragment lucC394 and
the N terminal fragments lucN412 to lucN416.
Example 2
[0058] In this Example, somatostatin receptor (SSTR2; somatostatin
type 2 receptor) (NM.sub.--000794) which is a GPCR (G-protein
coupled receptor) and .beta.-arrestin (arrestin, beta 2)
(NM.sub.--004313) were used instead of the FKBP and FRB. SSTR2 is a
membrane protein on the cell membrane, and when somatostatin binds
to extracellular domain of the GPCR, the intracellular domain of
the SSTR2 binds to .beta.-arrestin that is an adaptor molecule in
the cytoplasm, and a signal is transduced downstream. Accordingly,
the C terminal of the SSTR2 was bonded to the C terminal of the
Eluc, and the N terminal of the .beta.-arrestin was bonded to N
terminal of the Eluc, and the fusion proteins were expressed in the
cultured cells, and somatostatin was added to the cultured cells to
examine luminescence from the cells.
[0059] First, PCR was conducted by using a human brain cDNA library
(TAKARA) as template with the primers as shown below to obtain DNA
fragments coding for arrestin and the SSTR2.
TABLE-US-00002 ARRB2-nestF2: (SEQ ID NO: 54)
AAAGGATCCATGGGGGAGAAACCCGGGACCAGGGTCT ARRB2-nestR-Eco: (SEQ ID NO:
55) AAGAATTCCAGCAGAGTTGATCATCATAGT SSTR2_start_Bam: (SEQ ID NO: 56)
TTGGATCCATGGACATGGCGGATGAGCCAC SSTR2_R1107end_XhoI: (SEQ ID NO: 57)
TTTCTCGAGCCGATACTGGTTTGGAGGTCTCCATTG
[0060] The DNA coding for the arrestin was cleaved with BamHI and
EcoRI, and ligated to the plucN415 that had been cleaved with BamHI
and EcoRI and plucN415-arrestin was obtained. The plucN415 used had
been obtained by cleaving the plucN415-FKBP in Example 1 with
HindIII and BamHI and ligating with pcDNA3.1/myc-His(B) cleaved
with HindIII and BamHI.
[0061] In the meanwhile, the DNA fragment coding for the SSTR2 was
cleaved with BamHI and XhoI, inserted in the multicloning site of
pcDNA4/V5-His (B), and pSSTR2 was obtained. Then, the DNA coding
for lucC394 with the linker whose length was extended to 22 amino
acids was cleaved with XhoI and SacII, inserted at XhoI-SacII site
of the pSSTR2 and pSSTR2-lucC394 was obtained. It is to be noted
that the linker length of the lucC394 was extended to 22 amino
acids step by step by conducting PCR using pFRB-lucC394 as template
and linkerC12-F-XhoI (SEQ ID NO: 58) and PtGR-R542-SacII (SEQ ID
NO: 61) as primers, cleaving the PCR product with XhoI and SacII,
and inserting the fragment at the XhoI-SacII site of the pSSTR2;
conducting PCR using this product as template and linker C17-F-XhoI
(SEQ ID NO: 59) and PtGR-R542-SacII (SEQ ID NO: 61) as primers,
cleaving the PCR product with XhoI and SacII, and inserting the
fragment at XhoI-SacII site of the pSSTR2; and finally, conducting
PCR using this product as template and linkerC22-F-XhoI (SEQ ID NO:
60) and PtGR-R542-SacII (SEQ ID NO: 61) as primers, cleaving the
PCR product with XhoI and SacII, and inserting the fragment at
XhoI-SacII site of the pSSTR2.
TABLE-US-00003 linkerC12-F-XhoI: (SEQ ID NO: 58)
AGGCTCGAGTGGCGGTGGAGGTAGTGGAGGCGGCGGAACAAA linkerC17-F-XhoI: (SEQ
ID NO: 59) AGGCTCGAGTGGTGGTGGGGGCAGTGGCGGTGGAGGTAGTGG
linkerC22-F-XhoI: (SEQ ID No. 60)
AGGCTCGAGTGGAGGTGGCGGTTCTGGTGGTGGGGGCAGTGGCGGT PtGR-R542-SacII:
(SEQ ID No. 61) TTTCCGCGGCAGCTTAGAAGCCTTCTC
[0062] The pSSTR2-lucC394 and plucN415-arrestin thus prepared were
transfected to the HEK293 cells cultured in a 96 well plastic
culture dishes by using TtansIT Transfection Reagents (TAKARA).
After about 40 hours from the transfection, the cells were
incubated in a culture medium containing 1 .mu.m of somatostatin
for 12 minutes, ELA (TOYOBO) was added, and the luminescence was
measured with TriStar LB941 (Berthold Technologies). The
luminescence was also measured for the control cell with no
addition of the somatostatin, and the results were compared. As
shown in FIG. 6, addition of the somatostatin resulted in the
significant enhancement of the luminescence, whose intensity was
eight times.
[0063] Next, HEK293 cells which had been transfected with
plucN415-arrestin using 6 cm plastic culture dishes as described
above were cultured for 20 days in a culture medium containing 0.8
mg/mL of G418 and an HEK293 cell line (HEK293-ARRB2) capable of
constantly expressing lucN415-arrestin was prepared. This cell line
was transfected with pSSTR2-lucC394 as described above, and the
cells were cultured for 20 days in a culture medium containing 0.8
mg/mL of G418 and 0.04 mg/mL of Zeocin and an HEK293 cell line
(HEK293-ARRB2-SSTR2) capable of constantly expressing
lucN415-arrestin and SSTR2-lucC394 was prepared.
[0064] The cells were cultured in a 96 well plastic culture dish,
and after stimulating the cells for 12 minutes with somatostatin or
its analog (RIM23052 or BIM23056) at various concentrations,
luminescence was measured as described above. A dose-response curve
showing relationship of the luminescence intensity and the ligand
concentration was made from the results obtained.
[0065] As shown in FIG. 7, in the case of somatostatin, enhancement
in the luminescence was observed at a concentration of
3.times.10.sup.-9 to 3.times.10.sup.-7 M, and the enhancement was
not enhanced at the higher somatostatin concentration. In the case
of the somatostatin analogues, such enhancement in the luminescence
was not observed at the same concentration. Thus, quantitative
assay of the ligand activity to the receptor was enabled using the
assay system in which the luciferase split assay of the present
invention is applied to the receptor and the intracellular binding
element.
[0066] When HEK293-ARRB2-SSTR2 was stimulated with
1.times.10.sup.-6 M somatostatin and the luminescence was measured
at 3 minutes, 6 minutes, 12 minutes, 15 minutes, 30 minutes, 40
minutes, 50 minutes, and 90 minutes after the stimulation, the
luminescence reached 90% of the maximum luminescence in 5 minutes
and the luminescence reached its maximum in 12 minutes, as shown in
FIG. 8. After 12 minutes, the luminescence gradually reduced.
However, the level of 80% of the maximum luminescence was still
maintained after 90 minutes. Thus, the assay system employing the
luciferase split assay of the present invention has enabled more
prompt detection compared to the conventional protein-protein
interaction detection system.
[0067] The luciferase split assay of the present invention can be
applied to the GPCR other than SSTR2, namely ADRB2 (adrenergic beta
2 receptor, surface) (NM.sub.--000024), AGTRL1 (apelin receptor)
(NM.sub.--00516), EDNRB (endothelin receptor type B)
(NM.sub.--000115), and CCKBR (cholecystokinin B receptor)
(NM.sub.--17685), and the results shown in FIG. 9 were obtained in
similar experimental systems.
INDUSTRIAL APPLICABILITY
[0068] The present invention has enabled to provide a split
luciferase assay system having a remarkably high detection
sensitivity.
Sequence CWU 1
1
711149PRTPyrearinus termitilluminans 1Thr Lys Gly Tyr Val Asn Asn
Pro Gln Ala Thr Lys Glu Ala Ile Asp 1 5 10 15 Asp Asp Gly Trp Leu
His Ser Gly Asp Phe Gly Tyr Tyr Asp Glu Asp 20 25 30 Glu Tyr Phe
Tyr Ile Val Asp Arg Tyr Lys Glu Leu Ile Lys Tyr Lys 35 40 45 Gly
Tyr Gln Val Ala Pro Val Glu Leu Glu Glu Ile Leu Leu Gln His 50 55
60 Pro Gly Ile Arg Asp Val Ala Val Val Gly Ile Pro Asp Ile Glu Ala
65 70 75 80 Gly Glu Leu Pro Ala Gly Phe Val Val Lys Gln Pro Gly Ala
Gln Leu 85 90 95 Thr Ala Lys Glu Val Tyr Asp Phe Leu Ala Gln Arg
Val Ser His Ser 100 105 110 Lys Tyr Leu Arg Gly Gly Val Arg Phe Val
Asp Ser Ile Pro Arg Asn 115 120 125 Val Thr Gly Lys Ile Ser Arg Lys
Glu Leu Arg Glu Ala Leu Met Glu 130 135 140 Lys Ala Ser Lys Leu 145
2412PRTPyrearinus termitilluminans 2Met Glu Arg Glu Lys Asn Val Val
Tyr Gly Pro Glu Pro Lys His Pro 1 5 10 15 Leu Gly Asn Phe Thr Ala
Gly Glu Met Leu Tyr Asn Ala Leu His Lys 20 25 30 His Ser His Ile
Pro Gln Ala Ile Leu Asp Val Met Gly Asn Glu Ser 35 40 45 Leu Ser
Tyr Gln Glu Phe Phe Asp Thr Thr Val Lys Leu Gly Gln Ser 50 55 60
Leu Gln Asn Cys Gly Tyr Lys Met Asn Asp Val Val Ser Ile Cys Ala 65
70 75 80 Glu Asn Asn Lys Arg Phe Phe Ile Pro Ile Ile Ser Ala Trp
Tyr Ile 85 90 95 Gly Met Val Val Ala Pro Val Asn Glu Asp Tyr Ile
Pro Asp Glu Leu 100 105 110 Cys Lys Val Thr Gly Ile Ser Lys Pro Ile
Leu Val Phe Thr Thr Arg 115 120 125 Lys Ile Leu Pro Lys Val Leu Glu
Val Lys Asp Arg Thr Asn Tyr Ile 130 135 140 Lys Arg Ile Ile Ile Leu
Asp Ser Glu Glu Asn Leu Leu Gly Cys Glu 145 150 155 160 Ser Leu His
Asn Phe Met Ser Arg Tyr Ser Asp Asn Asn Leu Gln Thr 165 170 175 Phe
Lys Pro Leu His Tyr Asp Pro Val Asp Gln Val Ala Ala Ile Leu 180 185
190 Cys Ser Ser Gly Thr Thr Gly Leu Pro Lys Gly Val Met Gln Thr His
195 200 205 Arg Asn Ile Cys Val Arg Leu Thr His Ala Ser Asp Pro Arg
Val Gly 210 215 220 Thr Gln Leu Ile Pro Gly Val Ser Val Leu Ala Tyr
Leu Pro Phe Phe 225 230 235 240 His Ala Phe Gly Phe Ser Ile Asn Leu
Gly Tyr Phe Met Val Gly Leu 245 250 255 Arg Val Val Met Leu Arg Arg
Phe Asn Gln Glu Val Phe Leu Lys Ala 260 265 270 Ile Gln Asp Tyr Glu
Val Arg Ser Val Ile Asn Val Pro Ser Thr Ile 275 280 285 Leu Phe Leu
Ser Lys Ser Pro Leu Val Asp Lys Tyr Asp Leu Ser Thr 290 295 300 Leu
Ala Glu Leu Cys Cys Gly Ala Ala Pro Leu Ala Lys Glu Val Ala 305 310
315 320 Glu Ile Ala Val Lys Arg Leu Asn Leu Pro Gly Ile Arg Cys Gly
Tyr 325 330 335 Gly Leu Thr Glu Ser Thr Ser Ala Asn Ile His Thr Leu
His Asn Glu 340 345 350 Phe Lys Ser Gly Ser Leu Gly Lys Val Thr Pro
Tyr Met Ala Ala Lys 355 360 365 Ile Ile Asp Arg Asn Thr Gly Glu Ala
Leu Gly Pro Asn Gln Val Gly 370 375 380 Glu Leu Cys Ile Trp Gly Pro
Met Val Thr Lys Gly Tyr Val Asn Asn 385 390 395 400 Pro Gln Ala Thr
Lys Glu Ala Ile Asp Asp Asp Gly 405 410 3413PRTPyrearinus
termitilluminans 3Met Glu Arg Glu Lys Asn Val Val Tyr Gly Pro Glu
Pro Lys His Pro 1 5 10 15 Leu Gly Asn Phe Thr Ala Gly Glu Met Leu
Tyr Asn Ala Leu His Lys 20 25 30 His Ser His Ile Pro Gln Ala Ile
Leu Asp Val Met Gly Asn Glu Ser 35 40 45 Leu Ser Tyr Gln Glu Phe
Phe Asp Thr Thr Val Lys Leu Gly Gln Ser 50 55 60 Leu Gln Asn Cys
Gly Tyr Lys Met Asn Asp Val Val Ser Ile Cys Ala 65 70 75 80 Glu Asn
Asn Lys Arg Phe Phe Ile Pro Ile Ile Ser Ala Trp Tyr Ile 85 90 95
Gly Met Val Val Ala Pro Val Asn Glu Asp Tyr Ile Pro Asp Glu Leu 100
105 110 Cys Lys Val Thr Gly Ile Ser Lys Pro Ile Leu Val Phe Thr Thr
Arg 115 120 125 Lys Ile Leu Pro Lys Val Leu Glu Val Lys Asp Arg Thr
Asn Tyr Ile 130 135 140 Lys Arg Ile Ile Ile Leu Asp Ser Glu Glu Asn
Leu Leu Gly Cys Glu 145 150 155 160 Ser Leu His Asn Phe Met Ser Arg
Tyr Ser Asp Asn Asn Leu Gln Thr 165 170 175 Phe Lys Pro Leu His Tyr
Asp Pro Val Asp Gln Val Ala Ala Ile Leu 180 185 190 Cys Ser Ser Gly
Thr Thr Gly Leu Pro Lys Gly Val Met Gln Thr His 195 200 205 Arg Asn
Ile Cys Val Arg Leu Thr His Ala Ser Asp Pro Arg Val Gly 210 215 220
Thr Gln Leu Ile Pro Gly Val Ser Val Leu Ala Tyr Leu Pro Phe Phe 225
230 235 240 His Ala Phe Gly Phe Ser Ile Asn Leu Gly Tyr Phe Met Val
Gly Leu 245 250 255 Arg Val Val Met Leu Arg Arg Phe Asn Gln Glu Val
Phe Leu Lys Ala 260 265 270 Ile Gln Asp Tyr Glu Val Arg Ser Val Ile
Asn Val Pro Ser Thr Ile 275 280 285 Leu Phe Leu Ser Lys Ser Pro Leu
Val Asp Lys Tyr Asp Leu Ser Thr 290 295 300 Leu Ala Glu Leu Cys Cys
Gly Ala Ala Pro Leu Ala Lys Glu Val Ala 305 310 315 320 Glu Ile Ala
Val Lys Arg Leu Asn Leu Pro Gly Ile Arg Cys Gly Tyr 325 330 335 Gly
Leu Thr Glu Ser Thr Ser Ala Asn Ile His Thr Leu His Asn Glu 340 345
350 Phe Lys Ser Gly Ser Leu Gly Lys Val Thr Pro Tyr Met Ala Ala Lys
355 360 365 Ile Ile Asp Arg Asn Thr Gly Glu Ala Leu Gly Pro Asn Gln
Val Gly 370 375 380 Glu Leu Cys Ile Trp Gly Pro Met Val Thr Lys Gly
Tyr Val Asn Asn 385 390 395 400 Pro Gln Ala Thr Lys Glu Ala Ile Asp
Asp Asp Gly Trp 405 410 4414PRTPyrearinus termitilluminans 4Met Glu
Arg Glu Lys Asn Val Val Tyr Gly Pro Glu Pro Lys His Pro 1 5 10 15
Leu Gly Asn Phe Thr Ala Gly Glu Met Leu Tyr Asn Ala Leu His Lys 20
25 30 His Ser His Ile Pro Gln Ala Ile Leu Asp Val Met Gly Asn Glu
Ser 35 40 45 Leu Ser Tyr Gln Glu Phe Phe Asp Thr Thr Val Lys Leu
Gly Gln Ser 50 55 60 Leu Gln Asn Cys Gly Tyr Lys Met Asn Asp Val
Val Ser Ile Cys Ala 65 70 75 80 Glu Asn Asn Lys Arg Phe Phe Ile Pro
Ile Ile Ser Ala Trp Tyr Ile 85 90 95 Gly Met Val Val Ala Pro Val
Asn Glu Asp Tyr Ile Pro Asp Glu Leu 100 105 110 Cys Lys Val Thr Gly
Ile Ser Lys Pro Ile Leu Val Phe Thr Thr Arg 115 120 125 Lys Ile Leu
Pro Lys Val Leu Glu Val Lys Asp Arg Thr Asn Tyr Ile 130 135 140 Lys
Arg Ile Ile Ile Leu Asp Ser Glu Glu Asn Leu Leu Gly Cys Glu 145 150
155 160 Ser Leu His Asn Phe Met Ser Arg Tyr Ser Asp Asn Asn Leu Gln
Thr 165 170 175 Phe Lys Pro Leu His Tyr Asp Pro Val Asp Gln Val Ala
Ala Ile Leu 180 185 190 Cys Ser Ser Gly Thr Thr Gly Leu Pro Lys Gly
Val Met Gln Thr His 195 200 205 Arg Asn Ile Cys Val Arg Leu Thr His
Ala Ser Asp Pro Arg Val Gly 210 215 220 Thr Gln Leu Ile Pro Gly Val
Ser Val Leu Ala Tyr Leu Pro Phe Phe 225 230 235 240 His Ala Phe Gly
Phe Ser Ile Asn Leu Gly Tyr Phe Met Val Gly Leu 245 250 255 Arg Val
Val Met Leu Arg Arg Phe Asn Gln Glu Val Phe Leu Lys Ala 260 265 270
Ile Gln Asp Tyr Glu Val Arg Ser Val Ile Asn Val Pro Ser Thr Ile 275
280 285 Leu Phe Leu Ser Lys Ser Pro Leu Val Asp Lys Tyr Asp Leu Ser
Thr 290 295 300 Leu Ala Glu Leu Cys Cys Gly Ala Ala Pro Leu Ala Lys
Glu Val Ala 305 310 315 320 Glu Ile Ala Val Lys Arg Leu Asn Leu Pro
Gly Ile Arg Cys Gly Tyr 325 330 335 Gly Leu Thr Glu Ser Thr Ser Ala
Asn Ile His Thr Leu His Asn Glu 340 345 350 Phe Lys Ser Gly Ser Leu
Gly Lys Val Thr Pro Tyr Met Ala Ala Lys 355 360 365 Ile Ile Asp Arg
Asn Thr Gly Glu Ala Leu Gly Pro Asn Gln Val Gly 370 375 380 Glu Leu
Cys Ile Trp Gly Pro Met Val Thr Lys Gly Tyr Val Asn Asn 385 390 395
400 Pro Gln Ala Thr Lys Glu Ala Ile Asp Asp Asp Gly Trp Leu 405 410
5415PRTPyrearinus termitilluminans 5Met Glu Arg Glu Lys Asn Val Val
Tyr Gly Pro Glu Pro Lys His Pro 1 5 10 15 Leu Gly Asn Phe Thr Ala
Gly Glu Met Leu Tyr Asn Ala Leu His Lys 20 25 30 His Ser His Ile
Pro Gln Ala Ile Leu Asp Val Met Gly Asn Glu Ser 35 40 45 Leu Ser
Tyr Gln Glu Phe Phe Asp Thr Thr Val Lys Leu Gly Gln Ser 50 55 60
Leu Gln Asn Cys Gly Tyr Lys Met Asn Asp Val Val Ser Ile Cys Ala 65
70 75 80 Glu Asn Asn Lys Arg Phe Phe Ile Pro Ile Ile Ser Ala Trp
Tyr Ile 85 90 95 Gly Met Val Val Ala Pro Val Asn Glu Asp Tyr Ile
Pro Asp Glu Leu 100 105 110 Cys Lys Val Thr Gly Ile Ser Lys Pro Ile
Leu Val Phe Thr Thr Arg 115 120 125 Lys Ile Leu Pro Lys Val Leu Glu
Val Lys Asp Arg Thr Asn Tyr Ile 130 135 140 Lys Arg Ile Ile Ile Leu
Asp Ser Glu Glu Asn Leu Leu Gly Cys Glu 145 150 155 160 Ser Leu His
Asn Phe Met Ser Arg Tyr Ser Asp Asn Asn Leu Gln Thr 165 170 175 Phe
Lys Pro Leu His Tyr Asp Pro Val Asp Gln Val Ala Ala Ile Leu 180 185
190 Cys Ser Ser Gly Thr Thr Gly Leu Pro Lys Gly Val Met Gln Thr His
195 200 205 Arg Asn Ile Cys Val Arg Leu Thr His Ala Ser Asp Pro Arg
Val Gly 210 215 220 Thr Gln Leu Ile Pro Gly Val Ser Val Leu Ala Tyr
Leu Pro Phe Phe 225 230 235 240 His Ala Phe Gly Phe Ser Ile Asn Leu
Gly Tyr Phe Met Val Gly Leu 245 250 255 Arg Val Val Met Leu Arg Arg
Phe Asn Gln Glu Val Phe Leu Lys Ala 260 265 270 Ile Gln Asp Tyr Glu
Val Arg Ser Val Ile Asn Val Pro Ser Thr Ile 275 280 285 Leu Phe Leu
Ser Lys Ser Pro Leu Val Asp Lys Tyr Asp Leu Ser Thr 290 295 300 Leu
Ala Glu Leu Cys Cys Gly Ala Ala Pro Leu Ala Lys Glu Val Ala 305 310
315 320 Glu Ile Ala Val Lys Arg Leu Asn Leu Pro Gly Ile Arg Cys Gly
Tyr 325 330 335 Gly Leu Thr Glu Ser Thr Ser Ala Asn Ile His Thr Leu
His Asn Glu 340 345 350 Phe Lys Ser Gly Ser Leu Gly Lys Val Thr Pro
Tyr Met Ala Ala Lys 355 360 365 Ile Ile Asp Arg Asn Thr Gly Glu Ala
Leu Gly Pro Asn Gln Val Gly 370 375 380 Glu Leu Cys Ile Trp Gly Pro
Met Val Thr Lys Gly Tyr Val Asn Asn 385 390 395 400 Pro Gln Ala Thr
Lys Glu Ala Ile Asp Asp Asp Gly Trp Leu His 405 410 415
6416PRTPyrearinus termitilluminans 6Met Glu Arg Glu Lys Asn Val Val
Tyr Gly Pro Glu Pro Lys His Pro 1 5 10 15 Leu Gly Asn Phe Thr Ala
Gly Glu Met Leu Tyr Asn Ala Leu His Lys 20 25 30 His Ser His Ile
Pro Gln Ala Ile Leu Asp Val Met Gly Asn Glu Ser 35 40 45 Leu Ser
Tyr Gln Glu Phe Phe Asp Thr Thr Val Lys Leu Gly Gln Ser 50 55 60
Leu Gln Asn Cys Gly Tyr Lys Met Asn Asp Val Val Ser Ile Cys Ala 65
70 75 80 Glu Asn Asn Lys Arg Phe Phe Ile Pro Ile Ile Ser Ala Trp
Tyr Ile 85 90 95 Gly Met Val Val Ala Pro Val Asn Glu Asp Tyr Ile
Pro Asp Glu Leu 100 105 110 Cys Lys Val Thr Gly Ile Ser Lys Pro Ile
Leu Val Phe Thr Thr Arg 115 120 125 Lys Ile Leu Pro Lys Val Leu Glu
Val Lys Asp Arg Thr Asn Tyr Ile 130 135 140 Lys Arg Ile Ile Ile Leu
Asp Ser Glu Glu Asn Leu Leu Gly Cys Glu 145 150 155 160 Ser Leu His
Asn Phe Met Ser Arg Tyr Ser Asp Asn Asn Leu Gln Thr 165 170 175 Phe
Lys Pro Leu His Tyr Asp Pro Val Asp Gln Val Ala Ala Ile Leu 180 185
190 Cys Ser Ser Gly Thr Thr Gly Leu Pro Lys Gly Val Met Gln Thr His
195 200 205 Arg Asn Ile Cys Val Arg Leu Thr His Ala Ser Asp Pro Arg
Val Gly 210 215 220 Thr Gln Leu Ile Pro Gly Val Ser Val Leu Ala Tyr
Leu Pro Phe Phe 225 230 235 240 His Ala Phe Gly Phe Ser Ile Asn Leu
Gly Tyr Phe Met Val Gly Leu 245 250 255 Arg Val Val Met Leu Arg Arg
Phe Asn Gln Glu Val Phe Leu Lys Ala 260 265 270 Ile Gln Asp Tyr Glu
Val Arg Ser Val Ile Asn Val Pro Ser Thr Ile 275 280 285 Leu Phe Leu
Ser Lys Ser Pro Leu Val Asp Lys Tyr Asp Leu Ser Thr 290 295 300 Leu
Ala Glu Leu Cys Cys Gly Ala Ala Pro Leu Ala Lys Glu Val Ala 305 310
315 320 Glu Ile Ala Val Lys Arg Leu Asn Leu Pro Gly Ile Arg Cys Gly
Tyr 325 330 335 Gly Leu Thr Glu Ser Thr Ser Ala Asn Ile His Thr Leu
His Asn Glu 340 345 350 Phe Lys Ser Gly Ser Leu Gly Lys Val Thr Pro
Tyr Met Ala Ala Lys 355 360 365 Ile Ile Asp Arg Asn Thr Gly Glu Ala
Leu Gly Pro Asn Gln Val Gly 370 375 380 Glu Leu Cys Ile Trp Gly Pro
Met Val Thr Lys Gly Tyr Val Asn Asn 385 390 395 400 Pro Gln Ala Thr
Lys Glu Ala Ile Asp Asp Asp Gly Trp Leu His Ser 405 410 415
71611DNAArtificial Sequencemyc-His 7aagcttaccg ccatggagag
agagaagaac gtggtgtacg gccccgagcc caagcaccct 60ctgggcaact tcaccgccgg
cgagatgctg tacaacgctc tgcacaagca ctcccacatc 120ccccaggcca
tcctggacgt gatgggcaac gagtcccttt cctaccagga gttcttcgac
180actactgtga agctgggcca gagcctccag aactgtggct acaagatgaa
cgatgtcgtg 240tcgatctgtg cagagaacaa caagagattc ttcatcccca
tcatctccgc ctggtacatc 300ggcatggtgg tggcccctgt
gaacgaggac tatatcccag acgagctgtg taaagtgacc 360ggcatctcca
agccgatcct ggtcttcacc actaggaaga tcctgcctaa ggttttggag
420gttaaagaca gaaccaacta cataaagagg atcatcatac tggactctga
agagaacctg 480ctgggctgcg agagcctgca caacttcatg tccaggtact
ccgacaacaa cctccaaaca 540ttcaagcctc tgcactacga ccctgtggac
caggtagccg ccatcctgtg ctcctccggc 600acaaccggcc tgcctaaagg
cgtgatgcag acccacagga acatctgtgt gagactcaca 660cacgcatctg
accccagagt gggtacacaa ctcatccccg gcgtatccgt gctggcctac
720ctgccattct tccacgcctt cggcttcagt atcaacctgg gctatttcat
ggtgggcctg 780agagtggtga tgctccgaag gtttaaccag gaggtgttcc
tgaaggccat ccaggactac 840gaggtgagga gcgtgatcaa cgttccctcc
acaatcctgt tcctgtccaa gagccctctg 900gtggacaagt acgacctatc
caccctggcg gagctgtgct gtggagccgc tcctctggcg 960aaggaggtgg
ccgagatcgc cgtgaagagg ctgaacctgc cagggatacg gtgtggctac
1020ggtctaacag agtctacctc cgccaacatc catactctgc acaacgagtt
caagtccggc 1080tccctgggca aggtgacacc ttacatggcc gccaagatca
tcgacaggaa caccggcgag 1140gccctgggtc caaaccaggt gggcgagctg
tgcatctggg gacctatggt aacaaaaggc 1200tatgtgaaca acccacaggc
tactaaggag gccatcgacg acgacggctg gctgcacgga 1260ggaggcggag
gatccatggg cgtgcaggtg gagactatct ccccaggaga cgggcgcacc
1320ttccccaagc gcggccagac ctgcgtggtg cactacaccg ggatgcttga
agatggaaag 1380aaatttgatt cctcccggga cagaaacaag ccctttaagt
ttatgctagg caagcaggag 1440gtgatccgag gctgggaaga aggggttgcc
cagatgagtg tgggtcagag agccaaactg 1500actatatctc cagattatgc
ctatggtgcc actgggcacc caggcatcat cccaccacat 1560gccactctcg
tcttcgatgt ggagcttcta aaactggaac gctcgagtct a 16118790DNAArtificial
SequenceV5-His 8ggatcccccg ggctgcagga attctatggt agccatcctc
tggcatgaga tgtggcatga 60aggtctagaa gaggcctctc gcttgtactt tggggagagg
aacgtcaaag gcatgtttga 120ggtgctggag cccctgcatg ctatgatgga
acgcggtccc cagaccctga aggaaacgtc 180ctttaatcag gcatatggtc
gagatttaat ggaggcacaa gaatggtgcc gaaagtacat 240gaaatcaggg
aacgtcaagg acctcaccca agcctgggac ctctactatc acgtgttcag
300acggatatca cgctcgagtg gaggcggcgg aacaaaaggc tatgtgaaca
acccacaggc 360tactaaggag gccatcgacg acgacggctg gctgcactct
ggcgacttcg gctactacga 420cgaggacgag tatttctaca tcgtggaccg
gtacaaggag ctgatcaaat acaagggcta 480tcaggtcgcc cctgtggagc
tggaggagat cctccttcag cacccaggca tcagggacgt 540ggccgtcgtg
ggtatccctg acatcgaggc cggcgagctg ccagccggct tcgtggtgaa
600gcagcccggc gcccaactca ccgctaagga ggtgtacgac ttcctggccc
agagggtgtc 660tcactccaag tacctgaggg gcggcgtaag gttcgtggac
tctatcccca ggaacgtgac 720aggcaagatt agtcgaaaag agctgaggga
ggccctgatg gagaaggctt ctaagctggg 780cccgcggttc 790933DNAArtificial
SequencePCR primer 9aagcttgcca tggtaaagcg tgagaaaaat gtc
331036DNAArtificial SequencePCR primer 10ggatcctccg cctcctccgc
cgtcgtcgat ggcctc 361146DNAArtificial SequencePCR primer
11aggctcgagt ggaggcggcg gaggctggct gcactctggc gacttc
461235DNAArtificial SequencePCR primer 12cgcgggccca gcttagaagc
cttctccatc agggc 351333DNAArtificial SequencePCR primer
13tttaagctta ccgccatgga gagagagaag aac 331439DNAArtificial
SequencePCR primer 14tttggatcct ccgcctcctc cagtagcctg tgggttgtt
391539DNAArtificial SequencePCR primer 15tttggatcct ccgcctcctc
ccttagtagc ctgtgggtt 391639DNAArtificial SequencePCR primer
16tttggatcct ccgcctcctc cctccttagt agcctgtgg 391739DNAArtificial
SequencePCR primer 17tttggatcct ccgcctcctc cggcctcctt agtagcctg
391839DNAArtificial SequencePCR primer 18tttggatcct ccgcctcctc
cgatggcctc cttagtagc 391939DNAArtificial SequencePCR primer
19tttggatcct ccgcctcctc cgtcgatggc ctccttagt 392039DNAArtificial
SequencePCR primer 20tttggatcct ccgcctcctc cgtcgtcgat ggcctcctt
392139DNAArtificial SequencePCR primer 21tttggatcct ccgcctcctc
cgtcgtcgtc gatggcctc 392239DNAArtificial SequencePCR primer
22tttggatcct ccgcctcctc cgccgtcgtc gtcgatggc 392339DNAArtificial
SequencePCR primer 23tttggatcct ccgcctcctc cccagccgtc gtcgtcgat
392440DNAArtificial SequencePCR primer 24aggctcgagt ggaggcggcg
gaacaaaagg ctatgtgaac 402531DNAArtificial SequencePCR primer
25ttttccgcgg gcccagctta gaagccttct c 312639DNAArtificial
SequencePCR primer 26tttggatcct ccgcctcctc ccagccagcc gtcgtcgtc
392739DNAArtificial SequencePCR primer 27tttggatcct ccgcctcctc
cgtgcagcca gccgtcgtc 392839DNAArtificial SequencePCR primer
28tttggatcct ccgcctcctc cagagtgcag ccagccgtc 392939DNAArtificial
SequencePCR primer 29tttggatcct ccgcctcctc cgccagagtg cagccagcc
393040DNAArtificial SequencePCR primer 30aggctcgagt ggaggcggcg
gaaaaggcta tgtgaacaac 403140DNAArtificial SequencePCR primer
31aggctcgagt ggaggcggcg gaggctatgt gaacaaccca 403240DNAArtificial
SequencePCR primer 32aggctcgagt ggaggcggcg gatatgtgaa caacccacag
403340DNAArtificial SequencePCR primer 33aggctcgagt ggaggcggcg
gagtgaacaa cccacaggct 403440DNAArtificial SequencePCR primer
34aggctcgagt ggaggcggcg gaaacaaccc acaggctact 403540DNAArtificial
SequencePCR primer 35aggctcgagt ggaggcggcg gaccacaggc tactaaggag
403640DNAArtificial SequencePCR primer 36aggctcgagt ggaggcggcg
gacaggctac taaggaggcc 403740DNAArtificial SequencePCR primer
37aggctcgagt ggaggcggcg gaactaagga ggccatcgac 403840DNAArtificial
SequencePCR primer 38aggctcgagt ggaggcggcg gaaaggaggc catcgacgac
403940DNAArtificial SequencePCR primer 39aggctcgagt ggaggcggcg
gagaggccat cgacgacgac 404040DNAArtificial SequencePCR primer
40aggctcgagt ggaggcggcg gagccatcga cgacgacggc 404140DNAArtificial
SequencePCR primer 41aggctcgagt ggaggcggcg gaatcgacga cgacggctgg
404240DNAArtificial SequencePCR primer 42aggctcgagt ggaggcggcg
gagacgacga cggctggctg 404340DNAArtificial SequencePCR primer
43aggctcgagt ggaggcggcg gagacgacgg ctggctgcac 404440DNAArtificial
SequencePCR primer 44aggctcgagt ggaggcggcg gagacggctg gctgcactct
404540DNAArtificial SequencePCR primer 45aggctcgagt ggaggcggcg
gaggctggct gcactctggc 404640DNAArtificial SequencePCR primer
46aggctcgagt ggaggcggcg gatggctgca ctctggcgac 404743DNAArtificial
SequencePCR primer 47aggctcgagt ggaggcggcg gaaacccaca ggctactaag
gag 434843DNAArtificial SequencePCR primer 48aggctcgagt ggaggcggcg
gagctactaa ggaggccatc gac 434940DNAArtificial SequencePCR primer
49aggctcgagt ggaggcggcg gagtaacaaa aggctatgtg 405040DNAArtificial
SequencePCR primer 50aggctcgagt ggaggcggcg gaatggtaac aaaaggctat
405140DNAArtificial SequencePCR primer 51aggctcgagt ggaggcggcg
gacctatggt aacaaaaggc 405240DNAArtificial SequencePCR primer
52aggctcgagt ggaggcggcg gaggacctat ggtaacaaaa 405340DNAArtificial
SequencePCR primer 53aggctcgagt ggaggcggcg gatggggacc tatggtaaca
405437DNAArtificial SequencePCR primer 54aaaggatcca tgggggagaa
acccgggacc agggtct 375530DNAArtificial SequencePCR primer
55aagaattcca gcagagttga tcatcatagt 305630DNAArtificial SequencePCR
primer 56ttggatccat ggacatggcg gatgagccac 305736DNAArtificial
SequencePCR primer 57tttctcgagc cgatactggt ttggaggtct ccattg
365842DNAArtificial SequencePCR primer 58aggctcgagt ggcggtggag
gtagtggagg cggcggaaca aa 425942DNAArtificial SequencePCR primer
59aggctcgagt ggtggtgggg gcagtggcgg tggaggtagt gg
426046DNAArtificial SequencePCR primer 60aggctcgagt ggaggtggcg
gttctggtgg tgggggcagt ggcggt 466127DNAArtificial SequencePCR primer
61tttccgcggc agcttagaag ccttctc 276229DNAArtificial SequencePCR
primer 62tttaagctta tgcagccgcc tccaagtct 296338DNAArtificial
SequencePCR primer 63tttctcgagc cagatgagct gtatttatta ctggaacg
386430DNAArtificial SequencePCR primer 64ttggatccat ggggcaaccc
gggaacggca 306534DNAArtificial SequencePCR primer 65tttctcgagc
ccagcagtga gtcatttgta ctac 346632DNAArtificial SequencePCR primer
66ttggatccat ggaggaaggt ggtgattttg ac 326732DNAArtificial
SequencePCR primer 67tttctcgagc cgtcaaccac aagggtctcc tg
326831DNAArtificial SequencePCR primer 68tttaagctta tggagctgct
aaagctgaac c 316932DNAArtificial SequencePCR primer 69tttctcgagc
cgccagggcc cagtgtgctg at 32701629DNAPyrearinus termitilluminans
70atggagagag agaagaacgt ggtgtacggc cccgagccca agcaccctct gggcaacttc
60accgccggcg agatgctgta caacgctctg cacaagcact cccacatccc ccaggccatc
120ctggacgtga tgggcaacga gtccctttcc taccaggagt tcttcgacac
tactgtgaag 180ctgggccaga gcctccagaa ctgtggctac aagatgaacg
atgtcgtgtc gatctgtgca 240gagaacaaca agagattctt catccccatc
atctccgcct ggtacatcgg catggtggtg 300gcccctgtga acgaggacta
tatcccagac gagctgtgta aagtgaccgg catctccaag 360ccgatcctgg
tcttcaccac taggaagatc ctgcctaagg ttttggaggt taaagacaga
420accaactaca taaagaggat catcatactg gactctgaag agaacctgct
gggctgcgag 480agcctgcaca acttcatgtc caggtactcc gacaacaacc
tccaaacatt caagcctctg 540cactacgacc ctgtggacca ggtagccgcc
atcctgtgct cctccggcac aaccggcctg 600cctaaaggcg tgatgcagac
ccacaggaac atctgtgtga gactcacaca cgcatctgac 660cccagagtgg
gtacacaact catccccggc gtatccgtgc tggcctacct gccattcttc
720cacgccttcg gcttcagtat caacctgggc tatttcatgg tgggcctgag
agtggtgatg 780ctccgaaggt ttaaccagga ggtgttcctg aaggccatcc
aggactacga ggtgaggagc 840gtgatcaacg ttccctccac aatcctgttc
ctgtccaaga gccctctggt ggacaagtac 900gacctatcca ccctggcgga
gctgtgctgt ggagccgctc ctctggcgaa ggaggtggcc 960gagatcgccg
tgaagaggct gaacctgcca gggatacggt gtggctacgg tctaacagag
1020tctacctccg ccaacatcca tactctgcac aacgagttca agtccggctc
cctgggcaag 1080gtgacacctt acatggccgc caagatcatc gacaggaaca
ccggcgaggc cctgggtcca 1140aaccaggtgg gcgagctgtg catctgggga
cctatggtaa caaaaggcta tgtgaacaac 1200ccacaggcta ctaaggaggc
catcgacgac gacggctggc tgcactctgg cgacttcggc 1260tactacgacg
aggacgagta tttctacatc gtggaccggt acaaggagct gatcaaatac
1320aagggctatc aggtcgcccc tgtggagctg gaggagatcc tccttcagca
cccaggcatc 1380agggacgtgg ccgtcgtggg tatccctgac atcgaggccg
gcgagctgcc agccggcttc 1440gtggtgaagc agcccggcgc ccaactcacc
gctaaggagg tgtacgactt cctggcccag 1500agggtgtctc actccaagta
cctgaggggc ggcgtaaggt tcgtggactc tatccccagg 1560aacgtgacag
gcaagattag tcgaaaagag ctgagggagg ccctgatgga gaaggcttct
1620aagctgtaa 162971542PRTPyrearinus termitilluminans 71Met Glu Arg
Glu Lys Asn Val Val Tyr Gly Pro Glu Pro Lys His Pro 1 5 10 15 Leu
Gly Asn Phe Thr Ala Gly Glu Met Leu Tyr Asn Ala Leu His Lys 20 25
30 His Ser His Ile Pro Gln Ala Ile Leu Asp Val Met Gly Asn Glu Ser
35 40 45 Leu Ser Tyr Gln Glu Phe Phe Asp Thr Thr Val Lys Leu Gly
Gln Ser 50 55 60 Leu Gln Asn Cys Gly Tyr Lys Met Asn Asp Val Val
Ser Ile Cys Ala 65 70 75 80 Glu Asn Asn Lys Arg Phe Phe Ile Pro Ile
Ile Ser Ala Trp Tyr Ile 85 90 95 Gly Met Val Val Ala Pro Val Asn
Glu Asp Tyr Ile Pro Asp Glu Leu 100 105 110 Cys Lys Val Thr Gly Ile
Ser Lys Pro Ile Leu Val Phe Thr Thr Arg 115 120 125 Lys Ile Leu Pro
Lys Val Leu Glu Val Lys Asp Arg Thr Asn Tyr Ile 130 135 140 Lys Arg
Ile Ile Ile Leu Asp Ser Glu Glu Asn Leu Leu Gly Cys Glu 145 150 155
160 Ser Leu His Asn Phe Met Ser Arg Tyr Ser Asp Asn Asn Leu Gln Thr
165 170 175 Phe Lys Pro Leu His Tyr Asp Pro Val Asp Gln Val Ala Ala
Ile Leu 180 185 190 Cys Ser Ser Gly Thr Thr Gly Leu Pro Lys Gly Val
Met Gln Thr His 195 200 205 Arg Asn Ile Cys Val Arg Leu Thr His Ala
Ser Asp Pro Arg Val Gly 210 215 220 Thr Gln Leu Ile Pro Gly Val Ser
Val Leu Ala Tyr Leu Pro Phe Phe 225 230 235 240 His Ala Phe Gly Phe
Ser Ile Asn Leu Gly Tyr Phe Met Val Gly Leu 245 250 255 Arg Val Val
Met Leu Arg Arg Phe Asn Gln Glu Val Phe Leu Lys Ala 260 265 270 Ile
Gln Asp Tyr Glu Val Arg Ser Val Ile Asn Val Pro Ser Thr Ile 275 280
285 Leu Phe Leu Ser Lys Ser Pro Leu Val Asp Lys Tyr Asp Leu Ser Thr
290 295 300 Leu Ala Glu Leu Cys Cys Gly Ala Ala Pro Leu Ala Lys Glu
Val Ala 305 310 315 320 Glu Ile Ala Val Lys Arg Leu Asn Leu Pro Gly
Ile Arg Cys Gly Tyr 325 330 335 Gly Leu Thr Glu Ser Thr Ser Ala Asn
Ile His Thr Leu His Asn Glu 340 345 350 Phe Lys Ser Gly Ser Leu Gly
Lys Val Thr Pro Tyr Met Ala Ala Lys 355 360 365 Ile Ile Asp Arg Asn
Thr Gly Glu Ala Leu Gly Pro Asn Gln Val Gly 370 375 380 Glu Leu Cys
Ile Trp Gly Pro Met Val Thr Lys Gly Tyr Val Asn Asn 385 390 395 400
Pro Gln Ala Thr Lys Glu Ala Ile Asp Asp Asp Gly Trp Leu His Ser 405
410 415 Gly Asp Phe Gly Tyr Tyr Asp Glu Asp Glu Tyr Phe Tyr Ile Val
Asp 420 425 430 Arg Tyr Lys Glu Leu Ile Lys Tyr Lys Gly Tyr Gln Val
Ala Pro Val 435 440 445 Glu Leu Glu Glu Ile Leu Leu Gln His Pro Gly
Ile Arg Asp Val Ala 450 455 460 Val Val Gly Ile Pro Asp Ile Glu Ala
Gly Glu Leu Pro Ala Gly Phe 465 470 475 480 Val Val Lys Gln Pro Gly
Ala Gln Leu Thr Ala Lys Glu Val Tyr Asp 485 490 495 Phe Leu Ala Gln
Arg Val Ser His Ser Lys Tyr Leu Arg Gly Gly Val 500 505 510 Arg Phe
Val Asp Ser Ile Pro Arg Asn Val Thr Gly Lys Ile Ser Arg 515 520 525
Lys Glu Leu Arg Glu Ala Leu Met Glu Lys Ala Ser Lys Leu 530 535
540
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