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. 1989 Jun;171(6):3523–3529. doi: 10.1128/jb.171.6.3523-3529.1989

Suppression of recA deficiency in plasmid recombination by bacteriophage lambda beta protein in RecBCD- ExoI- Escherichia coli cells.

I Berger 1, A Cohen 1
PMCID: PMC210080  PMID: 2542228

Abstract

Plasmid recombination, like other homologous recombination in Escherichia coli, requires RecA protein in most conditions. We have found that the plasmid recombination defect in a recA mutant can be efficiently suppressed by the beta protein of bacteriophage lambda. beta protein is required for homologous recombination of lambda chromosomes during lytic phage growth in a recA host and is known to have a strand-annealing activity resembling that of RecA protein. The bioluminescence recombination assay was used for genetic analysis of beta-protein-mediated plasmid recombination. Efficient suppression of the recA mutation by beta protein required the absence of the E. coli nucleases exonuclease I and RecBCD nuclease. These nucleases inhibit a RecA-mediated plasmid recombination pathway that is more efficient than the pathway functioning in wild-type cells. Like RecA-mediated plasmid recombination in RecBCD- ExoI- cells, beta-protein-mediated plasmid recombination depended on concurrent DNA replication and on the activity of the recQ gene. However, unlike RecA-mediated plasmid recombination, beta-protein-mediated recombination in RecBCD- ExoI- cells was independent of recF and recJ activities. We propose that inactivation of exonuclease I and RecBCD nuclease stabilizes a recombination intermediate that is involved in RecA- and beta-protein-catalyzed homologous pairing reactions. We suggest that the intermediate may be linear plasmid DNA with a protruding 3' end, since these nucleases are known to interfere with the synthesis of such linear forms. The different recF and recJ requirements for beta-protein-dependent and RecA-dependent recombinations imply that the mechanisms of formation or processing of the putative intermediate differ in the two cases.

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Selected References

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