The herpes simplex virus type-1 origin binding protein. DNA helicase activity - PubMed (original) (raw)

. 1993 Jan 15;268(2):1220-5.

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PMID: 8380408

The herpes simplex virus type-1 origin binding protein. DNA helicase activity

P E Boehmer et al. J Biol Chem. 1993.

Abstract

The herpes simplex virus type 1 (HSV-1) origin binding protein, the product of the UL9 gene, catalyzes the unwinding of DNA in the 3'-5' direction. Helicase activity is coupled to the hydrolysis of ATP or dATP and to a lesser extent to CTP, dCTP, or UTP. It requires a divalent cation (Mg2+ > Mn2+ > Ca2+) with an optimum at 2.5 mM MgCl2. Activity is optimal at high pH (8.5-9.5) and high temperature (45 degrees C) and is inhibited at ionic strengths > 50 mM NaCl. The helicase activity is specifically stimulated by the HSV-1-encoded single-stranded DNA-binding protein, ICP8, which increases both the rate and extent of helicase activity. Helicase action appears to be stoichiometric, requiring a DNA-dependent assembly of a multimeric UL9 protein complex. Under optimal conditions, the rate of DNA unwinding is approximately 75 base pairs/min.

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The herpes simplex virus type-1 origin binding protein. DNA helicase activity - PubMed (original) (raw)