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The open reading frame P (ORF P) is located in the domain and on the DNA strand of the herpes simplex virus 1 transcribed during latent infection. ORF P is not expressed in productively infected cells as a consequence of repression by the binding of the major viral regulatory protein to its high-affinity binding site. In cells infected with a mutant virus carrying a derepressed gene, ORF P protein is extensively posttranslationally processed. We report that ORF P interacts with a component of the splicing factor SF2/ASF, pulls down a component of the SM antigens, and colocalizes with splicing factors in nuclei of infected cells. The hypothesis that ORF P protein may act to regulate viral gene expression, particularly in situations such as latently infected sensory neurons in which the major regulatory protein is not expressed, is supported by the evidence that in cells infected with a mutant in which the ORF P gene was derepressed, the products of the regulatory genes alpha 0 and alpha 22 are reduced in amounts early in infection but recover late in infection. The proteins encoded by these genes are made from spliced mRNAs, and the extent of recovery of these proteins late in infection correlates with the extent of accumulation of post-translationally processed forms of ORF P protein.

proceedings of the national academy of sciences of the united states of america

Open reading frame P--a herpes simplex virus gene repressed during productive infection encodes a protein that binds a splicing factor and reduces synthesis of viral proteins made from spliced mRNA.