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Cellular casein kinase II-mediated phosphorylation of rinderpest virus P protein is a prerequisite for its role in replication/transcription of the genome

Rajnish Kaushik

Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore 560012, India

Correspondence
M. S. Shaila
shaila{at}mcbl.iisc.ernet.in

Phosphoprotein P of rinderpest virus (RPV), when expressed in E. coli, is present in the unphosphorylated form. Bacterially expressed P protein was phosphorylated by a eukaryotic cellular extract, and casein kinase II (CK II) was identified as the cellular kinase involved in phosphorylation. In vitro phosphorylation of P-deletion mutants identified the N terminus as a phosphorylation domain. In vivo phosphorylation of single or multiple serine mutants of P protein identified serine residues at 49, 88 and 151 as phospho-acceptor residues. The role of P protein phosphorylation in virus replication/transcription was evaluated using the RPV minigenome system and replication/transcription of a reporter gene in vivo. P protein phosphorylation was shown to be essential for in vivo replication/transcription since phosphorylation-null mutants do not support expression of a reporter gene. Transfection of increased amounts of phosphorylation-null mutant did not support minigenome replication/transcription in vivo.

Present address: Department of Internal Medicine, Washington University School of Medicine, 660 S. Euclid Avenue, St Louis, MO 63110, USA.

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