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System to detect protein-protein interactions

  • US 5,468,614 A
  • Filed: 02/01/1994
  • Issued: 11/21/1995
  • Est. Priority Date: 01/24/1990
  • Status: Expired due to Term
First Claim
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1. A kit for detecting binding between a first test protein and a second test protein or fragments thereof in a host cell, the kit comprising in a container:

  • (a) a first vector, which comprises;

    (i) a first gene, which comprises;

    (1) a promoter that functions in a host cell,(2) a DNA sequence that encodes a DNA-binding domain and which is functionally associated with the promoter of the first gene, and(3) a means for inserting a DNA sequence encoding a first test protein or a fragment thereof into the first vector in such a manner that the first test protein is capable of being expressed as part of a hybrid protein containing the DNA binding domain,(ii) a means for replicating the first vector in the host cell, and(iii) a first marker gene, the expression of which in the host cell permits selection of cells containing the first marker gene from cells that do not contain the first marker gene, and(b) a second vector, which comprises;

    (i) a second gene, which comprises;

    (1) a promoter that functions in the host cell,(2) a DNA sequence that encodes a transcriptional activation domain which is functionally associated with the promoter of the second gene, and(3) a means for inserting a DNA sequence encoding the second test protein or a fragment thereof into the vector, in such a manner that the second test protein is capable of being expressed as part of a hybrid protein containing the transcriptional activation domain(ii) a means for replicating the second vector in the host cell, and(iii) a second marker gene, the expression of which in the host cell permits selection of cells containing the second marker gene from cells that do not contain the second marker gene; and

    (c) a host cell containing a detectable gene having a binding site for the DNA-binding domain wherein the detectable gene expresses a detectable protein when the detectable gene is activated by the transcriptional activation domain when the transcriptional activation domain is in sufficient proximity to the detectable gene;

    the host cell being incapable of expressing a protein having the function of;

    (i) the first marker gene;

    (ii) the second marker gene;

    (iii) the DNA-binding domain; and

    (iv) the transcriptional activation domain;

    wherein binding of the first test protein and the second test protein in the host cell results in measurably greater expression of the detectable gene than the simultaneous presence of the DNA-binding domain and the transcriptional activation domain in the absence of an interaction between the first test protein and the second test protein.

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