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We have cloned and determined the nucleotide sequence of a gene, pk, that lies immediately upstream from the gene encoding glycoprotein X in the short unique region of the alphaherpesvirus, pseudorabies virus (PRV). The gene has the potential to encode a protein of 334 amino acids, and is related to gene US3 of herpes simplex virus type 1 (HSV-1), which has been shown to encode a protein kinase. The predicted amino acid sequence encoded by the PRV pk gene is homologous to the corresponding sequence encoded by the HSV-1 US3 gene in the C-terminal catalytic domain, but diverges markedly in the N-terminal domain. As with HSV-1, the mRNA for the pk gene appears to be 3' coterminal with that for the glycoprotein downstream. An antiserum was raised against a protein generated from the fusion of part of the PRV pk catalytic domain with Escherichia coli beta-galactosidase. This specifically reacted with a previously described physically homogeneous protein kinase, PRV-PK, isolated from hamster fibroblasts lytically infected with PRV. Although the majority of the PRV-PK is found in the cytoplasm, some was also detected in purified PRV virions by using the same antibody; a similar distribution was found for the HSV-1 protein kinase, using an antiserum raised against the corresponding HSV-1 fusion protein. When presented with heatinactivated virions, purified PRV-PK (in common with certain cellular protein kinases also present in the virion) was able to phosphorylate in vitro the major virion phosphoprotein phosphorylated in vivo.

journal of general virology

The Protein Kinase Encoded in the Short Unique Region of Pseudorabies Virus: Description of the Gene and Identification of its Product in Virions and in Infected Cells