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Volume 271, Number 35, Issue of August 30, 1996 pp. 21645-21651
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

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The UL8 Subunit of the Herpes Simplex Virus Type-1 DNA Helicase-Primase Optimizes Utilization of DNA Templates Covered by the Homologous Single-strand DNA-binding Protein ICP8

(Received for publication, May 6, 1996, and in revised form, June 25, 1996)

Nicolas Tanguy Le Gac , Giuseppe Villani , Jean-Sébastien Hoffmann and Paul E. Boehmer ^§

From the ^§ Department of Microbiology and Molecular Genetics, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark, New Jersey 07103 and the  Institut de Pharmacologie et de Biologie Structurale, CNRS, 205 Route de Narbonne, 31077 Toulouse Cédex, France

The herpes simplex virus type-1 DNA helicase-primase is a heterotrimer encoded by the UL5, UL8, and UL52 genes. The core enzyme, specified by the UL5 and UL52 genes, retains DNA helicase, DNA-dependent nucleoside triphosphatase, and primase activities. The UL8 subunit has previously been implicated in increasing primer stability and in stimulating primer synthesis by the core enzyme. To further characterize the function of the UL8 subunit, we have examined its effect on the activities of the UL5/52 core enzyme using DNA templates covered by the herpes simplex virus type-1 single-strand DNA-binding protein ICP8. We found that while ICP8 stimulated the DNA helicase activity of the UL5/52 proteins up to 3-fold, maximum stimulation by ICP8 required the presence of UL8 protein. Moreover, UL8 protein was required to reverse the inhibitory effect of ICP8 on the DNA-dependent ATPase and primase activities of the UL5/52 proteins. These observations were specific for ICP8 since the heterologous Escherichia coli single-strand DNA-binding protein could not substitute for ICP8. These data suggest that UL8 protein mediates an interaction between the UL5/52 core enzyme and ICP8 that optimizes the utilization of ICP8-covered DNA templates during DNA replication.

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