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. 1987 Feb;169(2):790–795. doi: 10.1128/jb.169.2.790-795.1987

Cloning of the recA gene of Neisseria gonorrhoeae and construction of gonococcal recA mutants.

J M Koomey, S Falkow
PMCID: PMC211849  PMID: 3100504

Abstract

Interspecific complementation of an Escherichia coli recA mutant was used to identify recombinant plasmids within a genomic cosmid library derived from Neisseria gonorrhoeae that carry the gonococcal recA gene. These plasmids complement the E. coli recA mutation in both homologous recombination functions and resistance to DNA damaging agents. Subcloning, deletion mapping, and transposon Tn5 mutagenesis were used to localize the gonococcal gene responsible for suppression of the E. coli RecA- phenotype. Defined mutations in and near the cloned gonococcal recA gene were constructed in vitro and concurrently associated with a selectable genetic marker for N. gonorrhoeae and the mutated alleles were then reintroduced into the gonococcal chromosome by transformation-mediated marker rescue. This work resulted in the construction of two isogenic strains of N. gonorrhoeae, one of which expresses a reduced proficiency in homologous recombination activity and DNA repair function while the other displays an absolute deficiency in these capacities. These gonococcal mutants behaved similarly to recA mutants of other procaryotic species and displayed phenotypes consistent with the data obtained by heterospecific complementation in an E. coli recA host. The functional activities of the recA gene products of N. gonorrhoeae and E. coli appear to be highly conserved.

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Selected References

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