Interaction trap system for isolating proteins

摘要

Disclosed is a method for determining whether a first proteins capable of physically interacting with a second protein. The method involves: (a) providing a host cell which contains (i) a reporter gene operably linked to a protein binding site; (ii) a first fusion gene which expresses a first fusion protein, the first fusion protein including the first protein covalently bonded to a binding moiety which is capable of specifically binding to the protein binding site; and (iii) a second fusion gene which expresses a second fusions protein, the second fusion protein including the second protein covalently bonded t a weak gene activating moiety; and (b) measuring expression of the reporter gene as a measure of an interaction between the first and the second proteins. Such a determination facilitated the isolation of the gene encoding the interacting protein. Also disclosed herein is recombinant Cdil polypeptide, nucleic acid encoding the Cdil polypeptide, and uses thereof.Disclosed is a method for determining whether a first proteins capable of physically interacting with a second protein. The method involves: (a) providing a host cell which contains (i) a reporter gene operably linked to a protein binding site; (ii) a first fusion gene which expresses a first fusion protein, the first fusion protein including the first protein covalently bonded to a binding moiety which is capable of specifically binding to the protein binding site; and (iii) a second fusion gene which expresses a second fusions protein, the second fusion protein including the second protein covalently bonded t a weak gene activating moiety; and (b) measuring expression of the reporter gene as a measure of an interaction between the first and the second proteins. Such a determination facilitated the isolation of the gene encoding the interacting protein. Also disclosed herein is recombinant Cdil polypeptide, nucleic acid encoding the Cdil polypeptide, and uses thereof.