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Papers In Press, published online ahead of print April 1, 2002
J. Biol. Chem, 10.1074/jbc.M111951200
Submitted on December 14, 2001
Revised on March 28, 2002
Accepted on March 30, 2002

Assembly of the bacteriophage T4 helicase-architecture and stoichiometry of thegp41-gp59 complex

Faoud T. Ishmael, Stephen C. Alley, and Stephen J. Benkovic

Department of Chemistry, Pennsylvania State University, University Park, PA 16802

Corresponding Author: sjb1{at}psu.edu

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 strand binding protein on the lagging to expose a site for helicase binding. To gain a better understanding of the mechanism of helicase assembly, the architecture and stoichiometery of the gp41-gp59 complex was investigated. Both the N- and C-terminus 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.


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