Abstract:
:The retroviral cyclin protein (rv-cyclin) of walleye dermal sarcoma virus contains two known functional domains, a cyclin box motif and a carboxy terminal transcription activation domain (AD). The AD contacts TATA-binding protein-associated factor 9 (TAF9), and this action is necessary for both positive and negative regulation of transcription from host and viral promoters. Negative regulation occurs via interference with TAF9 binding by transcriptional activators. Transcription factors that share a functional TAF9-binding motif include NF-kappaB. Rv-cyclin down regulates NF-kappaB-dependent transcription, whether induced by TNFalpha or by direct phosphorylation of IkappaB by expressed MEKK1. In rv-cyclin-expressing cells, NF-kappaB p65 is phosphorylated and translocated to the nucleus, where it forms heterodimers with p50 and binds NF-kappaB response elements. Furthermore, interference with NF-kappaB is dependent upon an intact TAF9-binding motif in rv-cyclin. The outcome of this NF-kappaB down regulation is likely to be important in the control of virus replication and tumorigenesis.
journal_name
Virologyjournal_title
Virologyauthors
Quackenbush SL,Linton A,Brewster CD,Rovnak Jdoi
10.1016/j.virol.2008.12.026subject
Has Abstractpub_date
2009-03-30 00:00:00pages
55-60issue
1eissn
0042-6822issn
1096-0341pii
S0042-6822(08)00849-0journal_volume
386pub_type
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