J. Virol. doi:10.1128/JVI.02763-07
Copyright (c) 2008, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.
The expression of interferon
dependent genes is blocked independently by the virion host shutoff RNase and by the US3 protein kinase
Li Liang
and
Bernard Roizman*
Marjorie B. Kovler Viral Oncology Laboratories, The University of Chicago, 910 East 58th Street, Chicago IL 60637
* To whom correspondence should be addressed. Email:
bernard.roizman{at}bsd.uchicago.edu.
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Abstract |
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Interferon
receptor
(IFN
R
) is stable but posttranslationally modified in HSV-1(F) infected cells. Studies with antibody directed to the phosphorylation site indicate IFN
R
is phosphorylated by the US3 kinase. The modification is abolished in cells infected with
US3, DUL13 or
(US3/UL13) mutant viruses.. Transcripts of the IFN
-dependent genes do not accumulate in cells transduced with the US3 protein kinase and treated with interferon
. In contrast, the accumulation of IFN
-dependent gene transcripts is suppressed in wild-type virus infected cells, in cells infected with the
US3 mutant virus and to a lesser extent in the
UL41 virus-infected cells. The accumulation of IFN
-dependent gene transcripts in
UL41-infected cells could at least in part be due to a significant delay and reduction in the accumulation of the US3 protein. The results suggest that the expression of interferon
-dependent genes is blocked independently by the degradation of interferon
-dependent gene transcripts – a function of the virion host shutoff RNase, and by posttranslational modification of the IFN
R
protein.