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Institut für Virologie und Immunbiologie, Universität Würzburg, Versbacher Strasse 7, D-8700 Würzburg, Federal Republic of Germany
Coronavirus JHM contains six major proteins, one of which, the 60000 mol. wt. nucleocapsid protein pp60, is phosphorylated. In JHM-infected cells ip 60K, the intracellular precursor to pp60 is also phosphorylated. Associated with purified JHM virions is a protein kinase which will phosphorylate pp60 and a variety of exogenous substrates in vitro. The enzyme has the characteristics of a cyclic nucleotide-independent protein kinase. Both the in vivo reaction and the enzyme activity in vitro transferred the
-phosphate of ATP to serine residues on the nucleocapsid protein.
Received 8 July 1980;
accepted 1 September 1980.
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