Methods and compositions for interaction trap assays
First Claim
1. A population of host cells, each host cell comprising:
- (a) a polynucleotide encoding a fusion protein, the fusion protein comprising(i) an activation tag; and
(ii) a polypeptide sequence to be assayed for its interaction with a DNA sequence,(b) a transcriptional regulatory sequence comprising one or more binding sites for a zinc finger DNA-binding domain;
(c) a reporter gene operably linked to the transcriptional regulatory sequence, wherein expression of the reporter gene is modulated when the polypeptide sequence interacts with one or more of the binding sites;
wherein at least 107 unique pairs of the one or more binding sites and fusion proteins that bind to the 107 unique pairs of the one or more binding sites are represented in the population of host cells.
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Abstract
The present invention provides methods and compositions for interaction trap assays for detecting protein-protein, protein-DNA, or protein-RNA interactions. The methods and compositions of the invention may also be used to identify agents which may agonize or antagonize a protein-protein, protein-DNA, or protein-RNA interaction. In certain embodiments, the interaction trap system of the invention is useful for screening libraries with greater than 107 members. In other embodiments, the interaction trap system of the invention is used in conjunction with flow cytometry. The invention further provides a means for simultaneously screening a target protein or nucleic acid sequence for the ability to interact with two or more test proteins or nucleic acids.
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Citations
26 Claims
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1. A population of host cells, each host cell comprising:
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(a) a polynucleotide encoding a fusion protein, the fusion protein comprising (i) an activation tag; and (ii) a polypeptide sequence to be assayed for its interaction with a DNA sequence, (b) a transcriptional regulatory sequence comprising one or more binding sites for a zinc finger DNA-binding domain; (c) a reporter gene operably linked to the transcriptional regulatory sequence, wherein expression of the reporter gene is modulated when the polypeptide sequence interacts with one or more of the binding sites; wherein at least 107 unique pairs of the one or more binding sites and fusion proteins that bind to the 107 unique pairs of the one or more binding sites are represented in the population of host cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification