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J. Virol., Nov 1996, 7471-7477, Vol 70, No. 11
SP Lees-Miller, MC Long, MA Kilvert, V Lam, SA Rice and CA Spencer
The DNA-dependent protein kinase (DNA-PK) is involved in several
fundamental nuclear processes, including DNA double-strand break repair,
V(D)J recombination, and transcription by RNA polymerases I and II. In this
study, we show that infection of mammalian cells with herpes simplex virus
type 1 attenuates DNA-PK activity by specifically depleting the
p350/DNA-PKcs catalytic subunit. The half-life of the p350/DNA-PKcs protein
decreases from greater than 24 h to less than 4 h following infection. The
depletion of DNA-PK activity and p350/DNA-PKcs abundance is dependent on
expression of the viral immediate-early protein ICP0. As ICP0 acts as a
promoter-independent transactivator of gene expression, these data suggest
that ICP0 may function by directly or indirectly targeting the
p350/DNA-PKcs subunit of DNA-PK, thereby altering the inhibitory effects of
DNA-PK on RNA polymerase II transcription.
Copyright © 1996, American Society for Microbiology
Attenuation of DNA-dependent protein kinase activity and its catalytic subunit by the herpes simplex virus type 1 transactivator ICP0
Department of Biological Sciences, University of Calgary, Alberta, Canada.
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