Unraveling the late stages of recombinational repair: metabolism of DNA junctions in Escherichia coli - PubMed (original) (raw)
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Unraveling the late stages of recombinational repair: metabolism of DNA junctions in Escherichia coli
A Kuzminov. Bioessays. 1996 Sep.
Abstract
DNA junctions are by-products of recombinational repair, during which a damaged DNA sequence, assisted by RecA filament, invades an intact homologous DNA to form a joint molecule. The junctions are three-strand or four-strand depending on how many single DNA strands participate in joint molecules. In E. coli, at least two independent pathways to remove the junctions are proposed to operate. One is via RuvAB-promoted migration of four-strand junctions with their subsequent resolution by RuvC. In vivo, RuvAB and RuvC enzymes might work in a single complex, a resolvasome, to clean DNA from used RecA filaments and to resolve four-strand junctions. An alternative pathway for junction removal could be via RecG-promoted branch migration of three-strand junctions, provided that an as yet uncharacterized endonuclease activity incises one of the strands in the joint molecules.
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