RecA Protein of Escherichia Coli Promotes Branch Migration, a Kinetically Distinct Phase of DNA Strand Exchange

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1981 Jun 1

PMID 7022448

Citations 111

Authors

M M Cox

I R Lehman

Affiliations

Soon will be listed here.

Abstract

The recA protein of Escherichia coli promotes the complete exchange of strands between full-length linear duplex and single-stranded circular DNA molecules of bacteriophage phi X-174, converting more than 50% of the single-stranded DNA into heteroduplex replicative form II-like structures. Kinetically, the reaction can be divided into two phases, formation of short heteroduplex regions (D loops) and extension of the D loops via branch migration. recA protein participates directly in both phases. D loops are formed efficiently in the presence of ATP or the nonhydrolyzable ATP analog adenosine 5'-[gamma-thio]triphosphate, whereas D-loop extension requires continuous ATP hydrolysis. Complete strand exchange requires a stoichiometric amount of recA protein and is strongly stimulated by the single-stranded-DNA-binding protein of E. coli.

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