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    Proc Natl Acad Sci U S A. 2002 Oct 15;99(21):13403-8. Epub 2002 Sep 23.

    An activation domain in the C-terminal subunit of HCF-1 is important for transactivation by VP16 and LZIP.

    Luciano RL, Wilson AC.

    Department of Microbiology and Kaplan Comprehensive Cancer Center, New York University School of Medicine, 550 First Avenue, New York, NY 10016, USA.

    In herpes simplex virus, lytic replication is initiated by the viral transactivator VP16 acting with cellular cofactors Oct-1 and HCF-1. Although this activator complex has been studied in detail, the role of HCF-1 remains elusive. Here, we show that HCF-1 contains an activation domain (HCF-1(AD)) required for maximal transactivation by VP16 and its cellular counterpart LZIP. Expression of the VP16 cofactor p300 augments HCF-1(AD) activity, suggesting a mechanism of synergy. Infection of cells lacking the HCF-1(AD) leads to reduced viral immediate-early gene expression and lowered viral titers. These findings underscore the importance of HCF-1 to herpes simplex virus replication and VP16 transactivation.

    PMID: 12271126 [PubMed - indexed for MEDLINE]

    PMCID: 129685

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