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J Biol Chem, Vol. 273, Issue 20, 12274-12280, May 15, 1998

DNA Strand Invasion Promoted by Escherichia coli RecT Protein

Philippe Noirot and Richard D. Kolodner

From the Division of Human Cancer Genetics, Dana Farber Cancer Institute, and the Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115

The RecT protein of Escherichia coli is a DNA-pairing protein required for the RecA-independent recombination events promoted by the RecE pathway. The RecT protein was found to bind to both single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) in the absence of Mg2+. In the presence of Mg2+, RecT binding to dsDNA was inhibited drastically, whereas binding to ssDNA was inhibited only to a small extent. RecT promoted the transfer of a single-stranded oligonucleotide into a supercoiled homologous duplex to form a D (displacement)-loop. D-loop formation occurred in the absence of Mg2+ and at 1 mM Mg2+ but was inhibited by increasing concentrations of Mg2+ and did not require a high energy cofactor. Strand transfer was mediated by a RecT-ssDNA nucleoprotein complex reacting with a naked duplex DNA and was prevented by the formation of RecT-dsDNA nucleoprotein complexes. Finally, RecT mediated the formation of joint molecules between a supercoiled DNA and a linear dsDNA substrate with homologous 3'-single-stranded tails. Together these results indicate that RecT is not a helix-destabilizing protein promoting a reannealing reaction but rather is a novel type of pairing protein capable of promoting recombination by a DNA strand invasion mechanism. These results are consistent with the observation that RecE (exonuclease VIII) and RecT can promote RecA-independent double-strand break repair in E. coli.

Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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