Suppression of the defects in rdgB mutants of Escherichia coli K-12 by the cloned purA gene.

A gene suppressing the defects of Escherichia coli rdgB (recA-dependent growth) and recA(Ts) rdgB mutants was cloned. The cloned gene suppresses the hyper-Rec phenotype and the enhanced level of SOS functions in rdgB mutants at the nonpermissive temperature. We identified the cloned gene as purA.