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The Bel-1 protein of human foamy virus can activate transcription directed by the long terminal repeat (LTR) promoter of human immunodeficiency virus type 1 (HIV-1). The target sequence for Bel-1 is shown to lie within the HIV-1 LTR U3 region but does not coincide with any previously described factor-binding site. Gene expression directed by an HIV-1 LTR lacking functional sites for the inducible cellular transcription factor NF-kappa B was activated over 100-fold by coexpression of Bel-1. These observations suggest that Bel-1 has the potential to significantly enhance the level of HIV-1 gene expression in cells dually infected with HIV-1 and human foamy virus.

The Bel-1 protein of human foamy virus activates human immunodeficiency virus type 1 gene expression via a novel DNA target site