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Papers In Press, published online ahead of print November 15, 2001
J. Biol. Chem, 10.1074/jbc.M108316200
Submitted on August 29, 2001
Revised on November 8, 2001
Accepted on November 15, 2001

Activation of the herpes simplex virus type-1 origin binding protein (UL9) by heat shock proteins

Nicolas Tanguy Le Gac and Paul E. Boehmer

Department of Biochemistry and Molecular Biology (R-629), University of Miami School of Medicine, Miami, FL 33101-6129

Corresponding Author: pboehmer{at}molbio.med.miami.edu

Heat shock proteins participate in the initiation of DNA replication of different organisms by facilitating the assembly of initiation complexes. We have examined the effects of human heat shock proteins (Hsp40 and Hsp70) on the interaction of the herpes simplex virus type-1 initiator protein (UL9) with oriS, one of the viral origins of replication. Hsp40 and Hsp70 act substoichiometrically to increase the affinity of UL9 for oriS. The major contributor to this effect is Hsp40. Heat shock proteins also stimulate the ATPase activity of UL9 with oriS and increase opening of the origin. In contrast, heat shock proteins have no effect on the origin-independent activities of UL9 suggesting that their role is not merely in refolding denatured protein. These observations are consistent with a role for heat shock proteins in activating UL9 to efficiently initiate viral origin-dependent DNA replication. The action of heat shock proteins in this capacity is analogous to their role in activating the initiator proteins of other organisms.


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