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. 1997 Dec;71(12):9375–9382. doi: 10.1128/jvi.71.12.9375-9382.1997

Repression of human immunodeficiency virus type 1 through the novel cooperation of human factors YY1 and LSF.

F Romerio 1, M N Gabriel 1, D M Margolis 1
PMCID: PMC230241  PMID: 9371597

Abstract

A subpopulation of stably infected CD4+ cells capable of producing virus upon stimulation has been identified in human immunodeficiency virus (HIV)-positive individuals (T.-W. Chun, D. Finzi, J. Margolick, K. Chadwick, D. Schwartz, and R. F. Siliciano, Nat. Med. 1:1284-1290, 1995). Few host factors that directly limit HIV-1 transcription and could support this state of nonproductive HIV-1 infection have been described. YY1, a widely distributed human transcription factor, is known to inhibit HIV-1 long terminal repeat (LTR) transcription and virus production. LSF (also known as LBP-1, UBP, and CP-2) has been shown to repress LTR transcription in vitro, but transient expression of LSF has no effect on LTR activity in vivo. We report that both YY1 and LSF participate in the formation of a complex that recognizes the initiation region of the HIV-1 LTR. Further, we have found that these factors cooperate in the repression of LTR expression and viral replication. This cooperative function may account for the divergent effects of LSF previously observed in vitro and in vivo. Thus, the cooperation of two general cellular transcription factors may allow for the selective downregulation of HIV transcription. Through this mechanism of gene regulation, YY1 and LSF could contribute to the establishment and maintenance of a population of cells stably but nonproductively infected with HIV-1.

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Selected References

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