Intraction trap assay, reagents and uses thereof
First Claim
1. A method for detecting interaction between a first test polypeptide and a second test polypeptide, comprisingi. providing an interaction trap system including a prokaryotic host cell which contains(a) a reporter gene operably linked to a transcriptional regulatory sequence which includes a binding site (DBD recognition element) for a DNA-binding domain,(b) a first chimeric gene which encodes a first fusion protein, the first fusion protein including a DNA-binding domain and first test polypeptide,(c) a second chimeric gene which encodes a second fusion protein, the second fusion protein including an activation tag and second test polypeptide,wherein interaction of the first fusion protein and second fusion protein in the host cell results in a measurable change in expression of the reporter gene;
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Abstract
The present invention makes available an interaction trap system (hereinafter "ITS") which is derived using recombinantly engineered prokaryotic cells.
365 Citations
36 Claims
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1. A method for detecting interaction between a first test polypeptide and a second test polypeptide, comprising
i. providing an interaction trap system including a prokaryotic host cell which contains (a) a reporter gene operably linked to a transcriptional regulatory sequence which includes a binding site (DBD recognition element) for a DNA-binding domain, (b) a first chimeric gene which encodes a first fusion protein, the first fusion protein including a DNA-binding domain and first test polypeptide, (c) a second chimeric gene which encodes a second fusion protein, the second fusion protein including an activation tag and second test polypeptide, wherein interaction of the first fusion protein and second fusion protein in the host cell results in a measurable change in expression of the reporter gene; - and
ii. measuring expression of the reporter gene. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A kit for detecting interaction between a first test polypeptide and a second test polypeptide, the kit comprising:
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i. a first gene construct for encoding a first fusion protein, which first gene construct comprises; (1) transcriptional and translational elements which direct expression of the first fusion protein in a prokaryotic host cell, (2) a DNA sequence that encodes a DNA-binding domain and which is functionally associated with the transcriptional and translational elements of the first gene construct, and (3) a means for inserting a DNA sequence encoding a first test polypeptide into the first gene construct in such a manner that the first test polypeptide is expressed in-frame as part of the first fusion protein containing the DNA binding domain; ii. a second gene construct for encoding a second fusion protein, which second gene construct comprises; (1) transcriptional and translational elements which direct expression of the second fusion protein in a prokaryotic host cell, (2) a DNA sequence that encodes an activation tag, and which is functionally associated with the transcriptional and translational elements of the second gene construct, and (3) a means for inserting a DNA sequence encoding a second test polypeptide into the second vector in such a manner that the second test polypeptide is expressed in-frame as part of the second fusion protein containing the activation tag; and iii. a prokaryotic host cell containing a reporter gene having a binding site (DBD recognition element) for the DNA-binding domain, wherein the reporter gene expresses a detectable transcript or protein when the first and second fusion proteins interact. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method for identifying a nucleic acid encoding a test polypeptide which contacts another test polypeptide, comprising
i. providing an interaction trap system including a variegated population of prokaryotic host cells which each include: -
(a) a reporter gene operably linked to a transcriptional regulatory sequence which includes a binding site (DBD recognition element) for a DNA-binding domain, (b) a first chimeric gene which encodes a first fusion protein, the first fusion protein including a DNA-binding domain and first test polypeptide, (c) a second chimeric gene which encodes a second fusion protein, the second fusion protein including an activation tag and a second test polypeptide, wherein interaction of the first fusion protein and second fusion protein in the host cell results in measurable change of expression of the reporter gene, and one of the first or second chimeric genes is present in the host cell population as a variegated population with respect to nucleic acid sequence encoding test polypeptides; ii. measuring expression of the reporter gene; and iii. identifying nucleic acids which encode test polypeptides which increase expression of the reporter gene.
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35. A method for detecting interaction between a test polypeptide and a DNA sequence, comprising
i. providing a population of prokaryotic host cells which contain (a) a reporter gene operably linked to a transcriptional regulatory sequence which includes a binding site (DBD recognition element) for a DNA-binding domain, (b) a chimeric gene which encodes a fusion protein, the fusion protein including a test polypeptide and an activation tag, wherein interaction of the test polypeptide of the fusion protein with the DBD recognition element in the host cells results in a measurable change in expression of the reporter gene; - and
ii. measuring expression of the reporter gene, wherein the host cells comprise a variegated population of test polypeptides.
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36. A method for detecting interaction between a test polypeptide and a DNA sequence, comprising
i. providing a population of prokaryotic host cells which contain (a) a reporter gene operably linked to a transcriptional regulatory sequence which includes a binding site (DBD recognition element) for a DNA-binding domain, (b) a chimeric gene which encodes a fusion protein, the fusion protein including a test polypeptide and an activation tag, wherein interaction of the test polypeptide of the fusion protein with the DBD recognition element in the host cells results in a measurable change in expression of the reporter gene; - and
ii. measuring expression of the reporter gene, wherein the host cells-comprise a variegated population of DBD recognition elements.
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Specification