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The retroviral cyclin of walleye dermal sarcoma virus binds cyclin-dependent kinases 3 and 8. | LitMetric

The retroviral cyclin of walleye dermal sarcoma virus binds cyclin-dependent kinases 3 and 8.

Virology

Department of Microbiology, Immunology, and Pathology, 1619 Campus Delivery, Colorado State University, Fort Collins, CO 80523, USA.

Published: January 2011

AI Article Synopsis

Article Abstract

Walleye dermal sarcoma virus encodes a retroviral cyclin (rv-cyclin) with a cyclin box fold and transcription activation domain (AD). Co-immune precipitation (co-IP) identified an association of rv-cyclin with cyclin-dependent kinase 8 (cdk8). Cdk8 is dependent upon cyclin C and regulates transcription with the Mediator complex, a co-activator of transcription. Mutation of cyclin residues, required for cdk binding, disrupts rv-cyclin-cdk8 co-IP. Mutation or removal of the AD has no effect on cdk8 interaction. Direct rv-cyclin-cdk8 binding is demonstrated by pulldown of active cdk8 and by GST-rv-cyclin binding to recombinant cdk8. Cdk3 is also activated by cyclin C and phosphorylates retinoblastoma protein to initiate entry into the cell division cycle. Co-IP and pulldowns demonstrate direct rv-cyclin binding to cdk3 as well. The rv-cyclin functions as a structural ortholog of cyclin C in spite of its limited amino acid sequence identity with C cyclins or with any known cyclins.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3008307PMC
http://dx.doi.org/10.1016/j.virol.2010.10.022DOI Listing

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