Journal
JOURNAL OF VIROLOGY
Volume 80, Issue 6, Pages 3092-3097Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JVI.80.6.3092-3097.2006
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Funding
- MRC [MC_U130184136] Funding Source: UKRI
- Medical Research Council [MC_U130184136] Funding Source: researchfish
- Medical Research Council [MC_UU_12014/3, MC_U130184136] Funding Source: Medline
- Wellcome Trust [059008/Z/99/Z] Funding Source: Medline
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Interferon (IFN) signal transduction involves interferon regulatory factors (IRF). Kaposi's sarcoma-associated herpesvirus (KSHV) encodes four IRF homologues: viral IRF 1 (vIRF-1) to vIRF-4. Previous functional studies revealed that the first exon of vIRF-2 inhibited alpha/beta interferon (IFN-alpha/beta) signaling. We now show that full-length vIRF-2 protein, translated from two spliced exons, inhibited both IFN-alpha- and IFN-lambda-driven transactivation of a reporter promoter containing the interferon stimulated response element (ISRE). Transactivation of the ISRE promoter by IRF-1 was negatively regulated by vIRF-2 protein as well. Transactivation of a full-length IFN-beta reporter promoter by either IRF-3 or IRF-1, but not IRF-7, was also inhibited by vIRF-2 protein. Thus, vIRF-2 protein is an interferon induction antagonist that acts pleiotropically, presumably facilitating KSHV infection and dissemination in vivo.
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