Inhibition of interferon signaling by the Kaposi's sarcoma-associated herpesvirus full-length viral interferon regulatory factor 2 protein.

Abstract:

: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.

journal_name

J Virol

journal_title

Journal of virology

authors

Fuld S,Cunningham C,Klucher K,Davison AJ,Blackbourn DJ

doi

10.1128/JVI.80.6.3092-3097.2006

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

3092-7

issue

6

eissn

0022-538X

issn

1098-5514

pii

80/6/3092

journal_volume

80

pub_type

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