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radC102 of Escherichia coliIs an Allele of recG

ABSTRACT The radC102 mutation causes mild UV and X-ray sensitivity and was mapped previously to near pyrE andrecG at 82 min on the Escherichia colichromosome (I. Felzenszwalb, N. J. Sargentini, and K. C. Smith, Radiat. Res. 97:615–625, 1984). We report thatradC102 has two striking phenotypes characteristic ofrecG mutations. First, it causes dramatically increased RecA-dependent mutation in a stationary-phase mutation assay. Second, it causes extreme UV sensitivity in combination with ruvmutations affecting the RuvABC Holliday junction resolution system. DNA sequencing of the radC and recG genes inradC102 strains revealed that the radC102mutation creates a stop codon in recG that is predicted to truncate the RecG protein at 410 of 603 amino acids. A low-copy-number plasmid carrying the radC+ gene did not affect the UV sensitivity of a wild-type strain, a radC102 strain, or arecG258::Tn10mini-kanstrain. We conclude that radC102 is an allele ofrecG and that the function of the RadC protein remains to be determined.