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J Virol. 1992 August; 66(8): 5157-5160

Genetic assay for multimerization of retroviral gag polyproteins.

J Luban, K B Alin, K L Bossolt, T Humaran and S P Goff

Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York 10032.

ABSTRACT

We have established a genetic assay for the multimerization of retroviral gag polyproteins. This assay is based on the GAL4 two-hybrid system for studying protein-protein interactions (S. Fields and O. Song, Nature (London) 340:245-246, 1989). In our initial experiments, we generated Saccharomyces cerevisiae plasmids that separately express the GAL4 DNA-binding and GAL4 activation domains fused to the human immunodeficiency virus type 1 (HIV-1) gag polyprotein, Pr55gag. The coexpression of these two hybrid proteins in S. cerevisiae results in the association of the GAL4 domains and the potent activation of an integrated GAL4-responsive lacZ indicator gene. Similar results were obtained with plasmids encoding GAL4-Moloney murine leukemia virus (M-MuLV) gag polyprotein hybrid proteins. In contrast, the heterologous GAL4-HIV-1 gag and GAL4-M-MuLV gag fusion proteins were unable to interact with each other to induce lacZ expression. The results suggest that this yeast system provides a rapid and specific assay for the interactions of retroviral gag proteins that occur during virion assembly.

J Virol. 1992 August; 66(8): 5157-5160




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