Department of Medicine; Program in Immunology and Virology
Medical Subject Headings
Acetylation; Animals; Bovine papillomavirus 1; Cattle; Cell Line; DNA-Binding Proteins; *Gene Expression Regulation, Viral; *Host-Pathogen Interactions; Lysine; *Transcription, Genetic; Viral Proteins; p300-CBP Transcription Factors
Immunopathology | Molecular Genetics | Virology
The p300, CBP, and pCAF lysine acetyltransferase (KAT) proteins have been reported to physically interact with bovine (BPV) and human (HPV) papillomavirus E2 proteins. While overexpression of these KAT proteins enhances E2-dependent transcription, the mechanism has not been determined. Using RNA interference (RNAi) to deplete these factors, we demonstrated that E2 transcriptional activity requires physiological levels of p300, CBP, and pCAF. Each protein appears to have a unique function in E2-dependent transcription, since overexpression of one KAT failed to compensate for RNAi knockdown of another KAT. Using an in vitro acetylation assay, we identified highly conserved lysines that are targeted by p300 for acetylation. The conservative changes of lysines at positions 111 and 112 to arginine were of particular interest. The K111R and the K111R/K112R mutants showed reduced transcriptional activity that was not responsive to p300 overexpression, while the K112R mutant retained activity. p300 and CBP were detected at the viral promoter; however, pCAF was not. We propose a model by which E2 transcriptional activity is controlled by p300-mediated acetylation of lysine 111. This model represents a novel mechanism regulating papillomavirus gene expression.
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Citation: J Virol. 2013 Feb;87(3):1497-507. doi: 10.1128/JVI.02771-12. Epub 2012 Nov 14. Link to article on publisher's site
Quinlan, Edward J.; Culleton, Sara P.; Wu, Shwu-Yuan; Chiagn, Cheng-Ming; and Androphy, Elliot J., "Acetylation of conserved lysines in bovine papillomavirus E2 by p300" (2013). University of Massachusetts Medical School Faculty Publications. 197.