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The 65-kilodalton DNA-binding protein (65KDBP) of herpes simplex virus type 1 (HSV-1), the product of the UL42 gene, is required for DNA replication both in vitro and in vivo, yet its actual function is unknown. By two independent methods, it was shown that the 65KDBP stimulates the activity of the HSV-1-encoded DNA polymerase (Pol). When Pol, purified from HSV-1-infected cells, was separated from the 65KDBP, much of its activity was lost. However, addition of the 65KDBP, purified from infected cells, stimulated the activity of Pol 4- to 10-fold. The ability of a monoclonal antibody to the 65KDBP to remove the Pol-stimulating activity from preparations of the 65KDBP confirmed that the activity was not due to a trace contaminant. Furthermore, the 65KDBP did not stimulate the activity of other DNA polymerases derived from T4, T7, or Escherichia coli. The 65KDBP gene transcribed in vitro from cloned DNA and translated in vitro in rabbit reticulocyte lysates also was capable of stimulating the product of the pol gene when the RNAs were cotranslated. The product of a mutant 65KDBP gene missing the carboxy-terminal 28 amino acids exhibited wild-type levels of Pol stimulation, while the products of two large deletion mutants of the gene could not stimulate Pol activity. These experiments suggest that the 65KDBP may be an accessory protein for the HSV-1 Pol.

The essential 65-kilodalton DNA-binding protein of herpes simplex virus stimulates the virus-encoded DNA polymerase