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J. Exp. Med.,
Volume 189, Number 1, January 4, 1999 51-62
By

From the * Section on Pediatric Endocrinology, Developmental Endocrinology Branch, National
Institute of Child Health and Human Development, and the The HIV-1 virion-associated accessory protein Vpr affects both viral replication and cellular
transcription, proliferation, and differentiation. We report that Vpr enhances the activity of
glucocorticoids in lymphoid and muscle-derived cell lines by interacting directly with the glucocorticoid receptor and general transcription factors, acting as a coactivator. Vpr contains the signature motif LXXLL also present in cellular nuclear receptor coactivators, such as steroid receptor coactivator 1 and p300/CREB-binding protein, which mediates their interaction with
the glucocorticoid and other nuclear hormone receptors. A mutant Vpr molecule with disruption of this coactivator signature motif lost its ability to influence transcription of glucocorticoid-responsive genes and became a dominant-negative inhibitor of Vpr, possibly by retaining its general transcription factor-binding activities. The glucocorticoid coactivator activity of Vpr
may contribute to increased tissue glucocorticoid sensitivity in the absence of hypercortisolism and to the pathogenesis of AIDS.
Kidney Disease Section, Metabolic
Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National
Institutes of Health, Bethesda, Maryland 20892; and the § Human Retrovirus Section, ABL Basic
Research Program, National Cancer Institute-Frederick Cancer Research and Development Center,
Frederick, Maryland 21702
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