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Transcriptional activation by the human herpesvirus-8-encoded interferon regulatory factor.


J Gen Virol. 1999 Aug;80 ( Pt 8):2205-9. Unique Identifier : AIDSLINE

Human herpesvirus-8 (HHV-8), a gammaherpesvirus that is thought to be the viral aetiologic agent of Kaposi's sarcoma and primary effusion lymphoma, encodes a homologue to cellular interferon regulatory factors (IRFs). The HHV-8 IRF homologue (vIRF; ORF K9) has previously been shown to inhibit gene induction by interferons and IRF-1 and to transform NIH3T3 cells or Rat-1 cells. Additionally, expression of antisense to vIRF in BCBL-1 cells results in the repression of certain HHV-8 genes, suggesting that vIRF may also positively regulate gene expression. We demonstrate that vIRF activates transcription when directed to DNA by the GAL4 DNA-binding domain. GAL-vIRF truncation constructs that individually are incapable of activating transcription can cooperate in transactivation when coexpressed in HeLa cells, suggesting that multiple regions of vIRF are involved in transactivation. These studies broaden the potential mechanisms of action of vIRF to include transcriptional activation as well as transcriptional repression.

JOURNAL ARTICLE Chloramphenicol O-Acetyltransferase/GENETICS DNA-Binding Proteins/GENETICS/*METABOLISM Genes, Reporter Hela Cells *Herpesvirus, Kaposi Sarcoma-Associated/GENETICS Human Recombinant Fusion Proteins/GENETICS/METABOLISM Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S. *Trans-Activation (Genetics) Trans-Activators/GENETICS/*METABOLISM Viral Proteins/GENETICS/*METABOLISM


Information in this article was accurate in December 30, 1999. The state of the art may have changed since the publication date. This material is designed to support, not replace, the relationship that exists between you and your doctor. Always discuss treatment options with a doctor who specializes in treating HIV.