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    Mol Cell. 1999 Jun;3(6):729-39.

    Activation of Vav by Nef induces cytoskeletal rearrangements and downstream effector functions.

    Fackler OT, Luo W, Geyer M, Alberts AS, Peterlin BM.

    Source

    Howard Hughes Medical Institute, Department of Medicine, University of California at San Francisco 94143-0703, USA.

    Abstract

    Nef of primate lentiviruses is critical for high levels of viremia and the progression to AIDS. Nef associates with and activates a serine/threonine kinase (Nef-associated kinase [NAK]) via the small GTPases Rac1 and Cdc42. We identified the protooncogene and guanine nucleotide exchange factor Vav as the specific binding partner of Nef proteins from HIV-1 and SIV. The interaction between Nef and Vav led to increased activity of Vav and its downstream effectors. Both cytoskeletal changes and the activation of c-Jun N-terminal kinase (JNK) were observed. Furthermore, a dominant-negative Vav protein inhibited NAK activation and viral replication. Thus, the interaction between Nef and Vav initiates a signaling cascade that changes structural and physiological parameters in the infected cell.

    PMID:
    10394361
    [PubMed - indexed for MEDLINE]

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