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    Cell. 1993 Jun 18;73(6):1067-78.

    Human immunodeficiency virus type 1 Gag protein binds to cyclophilins A and B.

    Luban J, Bossolt KL, Franke EK, Kalpana GV, Goff SP.

    Source

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

    Abstract

    Retroviral Gag protein is capable of directing the assembly of virion particles independent of other retroviral elements and plays an important role early in the infection of a cell. Using the GAL4 two hybrid system, we screened a cDNA expression library and identified two host proteins, cyclophillins (CyPs) A and B, which interact specifically with the human immunodeficiency virus type 1 (HIV-1) Gag polyprotein Pr55gag. Glutathione S-transferase-CyP fusion proteins bind tightly to Pr55gag in vitro, as well as to the HIV-1 capsid protein p24. Cyclosporin A efficiently disrupts the Gag-CyPA interaction and less efficiently disrupts the Gag-CyPB interaction. The Gag-CyP interaction may be important for the HIV-1 life cycle and may be relevant to the pathology caused by this immunosuppressive virus.

    PMID:
    8513493
    [PubMed - indexed for MEDLINE]

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