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Revision as of 01:30, 20 February 2009

Boehmer, PE and Emmerson, PT (1992) The RecB subunit of the Escherichia coli RecBCD enzyme couples ATP hydrolysis to DNA unwinding.J. Biol. Chem. 267:4981-7

Abstract

The RecB subunit of the Escherichia coli RecBCD enzyme has previously been reported to possess DNA-dependent ATPase activity (Hickson, I. D., Robson, C. N., Atkinson, K. E., Hutton, L., and Emmerson, P. T. (1985) J. Biol. Chem. 260, 1224-1229). Here we demonstrate that a specific interaction between RecB protein and ATP can also be shown by photoaffinity labeling with the ATP analogue 8-azido-ATP. Furthermore, the capacity of the RecB protein to support ATP hydrolysis varies with the structure and length of the DNA cofactor. Single-stranded linear and circular DNA are markedly better in promoting ATP hydrolysis than duplex DNA. The purified RecB protein can function as a DNA helicase, displacing oligonucleotides annealed to viral M13 DNA in an ATP-dependent and orientation-specific manner.

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