Regulation of expression of sodA and msrA genes of corynebacterium glutamicum in response to oxidative and radiative stress

Abstract

Promoters of genes encoding superoxide dismutase (sodA) and peptide methionine sulfoxide reductase (msrA) from Corynebacterium glutamicum were cloned and sequenced. Promoter region analysis of sodA-msrA was unable to identify putative sites of fixed eventual regulators except for possible sites of fixed OxyR and integration host factor. A study of the regulation of these genes was performed using the lacZ gene of Escherichia coli as a reporter placed under the control of sequences downstream of sodA and msrA. In silico analysis was used to identify regulators in the genome of C. glutamicum, which revealed the absence of homologs of soxRS and arcA and the presence of inactive oxyR and putative candidates of the homologs of ahpC, ohrR, integration host factor, furA, IdeR, diphtheria toxin repressor, and mntR.