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Originally published In Press as doi:10.1074/jbc.M111951200 on April 1, 2002

J. Biol. Chem., Vol. 277, Issue 23, 20555-20562, June 7, 2002
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Assembly of the Bacteriophage T4 Helicase
ARCHITECTURE AND STOICHIOMETRY OF THE gp41-gp59 COMPLEX*

Faoud T. Ishmael, Stephen C. AlleyDagger , and Stephen J. Benkovic§

From the Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802

The bacteriophage T4 59 protein (gp59) plays an essential role in recombination and replication by mediating the assembly of the gene 41 helicase (gp41) onto DNA. gp59 is required to displace the gp32 single-stranded binding protein on the lagging strand to expose a site for helicase binding. To gain a better understanding of the mechanism of helicase assembly, the architecture and stoichiometry of the gp41-gp59 complex were investigated. Both the N and C termini of gp41 were found to lie close to or in the gp41-gp41 subunit interface and interact with gp59. The site of interaction of gp41 on gp59 is proximal to Cys-215 of gp59. Binding of gp41 to gp59 stimulates a conformational change in the protein resulting in hexamer formation of gp59, and gp59 likewise stimulates oligomer formation of gp41. The gp59 subunits in this complex are arranged in a head to head orientation, such that Cys-42 of one subunit is in close proximity to Cys-42 on an adjacent subunit, and Cys-215 on one subunit is close to Cys-215 on a neighboring subunit. As the helicase is loaded onto DNA, a conformational change in the gp41-gp59 complex occurs, which may serve to displace gp32 from the lagging strand and load the hexameric helicase in its place.

* The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger Present address: Chiron Corp., 201 Elliot Ave. W., Suite 150, Seattle, WA 98119.

§ To whom correspondence should be addressed: Dept. of Chemistry, 414 Wartik Laboratory, University Park, PA 16802. Tel.: 814-865-2882; Fax: 814-865-2973; E-mail: sjb1@psu.edu.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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