Control of sensitivity to inactivation by H2O2 and broad-spectrum near-UV radiation by the Escherichia coli katF locus

Abstract

Mutations in the Escherichia coli katF gene (hydroperoxidase II) result in sensitivity to inactivation by H2O2 and broad-spectrum near-UV (NUV; 300 to 400 nm) radiation. Another mutation, nur, originally described as conferring sensitivity to inactivation by broad-spectrum and monochromatic NUV, also confers sensitivity to inactivation by H2O2. Genetic analysis via transduction suggests that the nur mutation allele of the katF locus. As previously reported for broad-spectrum and monochromatic NUV wavelengths, the sensitivity of a particular strain to H2O2 inactivation is also independent of the recA and uvrA alleles. Extracts of nur and katF strains lack catalase (hydroperoxidase II) as revealed by polyacrylamide gels stained for such activity, which is consistent with the genetic results.