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Herpes simplex virus-1 helicase-primase. Physical and catalytic properties.

Herpes simplex virus type 1 (HSV-1) encodes a helicase-primase that consists of the products of the UL5, UL8, and UL52 genes (Crute, J. J., Tsurumi, T., Zhu, L., Weller, S. K., Olivo, P. D., Challberg, M. D., Mocarski, E. S. and Lehman, I. R. (1989) Proc. Natl. Acad. Sci. U. S. A. 86, 2186-2189). Further characterization of the three-subunit enzyme isolated from HSV-1-infected CV-1 cells shows it to be a heterotrimer, consisting of one polypeptide encoded by each of the UL5, UL8, and UL52 genes. Analysis of the primase and helicase components of the HSV-1 helicase-primase has shown that the primase component synthesizes oligoribonucleotide primers 8-12 nucleotides in length. The helicase component unwinds duplex DNA substrates at the rate of about two nucleotides/s, but only in the presence of the HSV-1-encoded single-stranded DNA binding protein. Thus, the HSV-1 helicase-primase contains the requisite enzymatic activities that permit it to function at the viral replication fork.[1]


  1. Herpes simplex virus-1 helicase-primase. Physical and catalytic properties. Crute, J.J., Lehman, I.R. J. Biol. Chem. (1991) [Pubmed]
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