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. 1987 Sep;169(9):4203–4210. doi: 10.1128/jb.169.9.4203-4210.1987

Escherichia coli K-12 mutants in which viability is dependent on recA function.

J Clyman, R P Cunningham
PMCID: PMC213730  PMID: 2442140

Abstract

A gene required for growth and viability in recA mutants of Escherichia coli K-12 was identified. This gene, rdgB (for Rec-dependent growth), mapped near 64 min on the E. coli genetic map. In a strain carrying a temperature-sensitive recA allele, recA200, and an rdgB mutation, DNA synthesis but not protein synthesis ceased after 80 min of incubation at 42 degrees C, and there was extensive DNA degradation. The rdgB mutation alone had no apparent effect on DNA synthesis or growth; however, mutant strains did show enhanced intrachromosomal recombination and induction of the SOS regulon. The rdgB gene was cloned and its-gene product identified through the construction and analysis of deletion and insertion mutations of rdgB-containing plasmids. The ability of a plasmid to complement an rdgB recA mutant was correlated with its ability to produce a 25-kilodalton polypeptide as detected by the maxicell technique.

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Selected References

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