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(Received for publication, March 31, 1997, and in revised form, June 25, 1997)
From the The Herpes simplex virus type 1 primosome
consists of three subunits that are the products of the
UL5, UL8, and UL52 genes. The
heterotrimeric enzyme has DNA-dependent ATPase, helicase, and primase activities. Earlier studies show that a subassembly consisting of the UL5 and UL52 gene products
was indistinguishable from the heterotrimeric enzyme in its helicase
and primase activities. We demonstrate here that the UL8 protein is
required for the helicase activity of the UL5/52 subassembly on long
duplex DNA substrates (>30 nucleotides) with a single-stranded DNA
loading site fully coated with the virus-encoded single strand DNA
binding protein, ICP8. The Escherichia coli single strand
DNA binding protein cannot substitute for ICP8, suggesting a specific
physical interaction between ICP8 and the UL8 protein. Surface plasmon
resonance measurements demonstrated an interaction between ICP8 and the
UL5/52/8 heterotrimer but not with the UL5/52 subassembly or the UL8
protein alone. At a subsaturating level of ICP8, the UL5/52 subassembly
does show helicase activity, suggesting that the subassembly can bind to single-stranded DNA but not to ICP8-coated DNA.
Volume 272, Number 36,
Issue of September 5, 1997
pp. 22766-22770
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
¶
,
,
Departments of Biochemistry and
Structural Biology, Stanford University School of Medicine,
Stanford, California 94305-5307 and ¶ Department of Medical
Biochemistry, Göteborg University, Medicinaregatan 9, S-413 90 Göteborg, Sweden
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