[Oxidative and SOS-response in Escherichia coli and their interference].
Interference between the oxidative and SOS responses in Escherichia coli was studied. The oxidative response involves both reactive oxygen scavenging system and DNA repair systems which are distinct from either the SOS or adaptive response to alkylating agents. The oxyR gene is a positive regulatory gene for the oxidative response and controls at least 9 proteins which are induced by treatment with H2O2. This gene is not a portion of the SOS regulon that involves at least 17 different genes in E. coli and controls the SOS response--another inducible and nonspecific repair activity. The SOS response was measured in E. coli PQ37 by means of a sfiA: :lacZ operon fusion according to "SOS Chromotest" in a completely automated system "Bioscreen C" (Labsystems, Finland). Our data have shown that: 1) H2O2 was a potent inducer of sfiA gene--one of the SOS genes; 2) there was strong negative effect of the oxidative response on the subsequent induction of the SOS response. In common with our previous findings it should be concluded that there is an interference between the SOS response--on the one hand, and the adaptive and oxidative responses--on the other. The nonspecific heat shock response is proposed to be a main key in these interferences.
Vasil'eva
S V
SV
Iskandarova
K A
KA
Makhova
E V
EV
D001761:Bleomycin / Q000494:pharmacology; D002413:Cations, Divalent; D003300:Copper / Q000378:metabolism; D004260:DNA Repair; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D005798:Genes, Bacterial; D005809:Genes, Regulator; D006861:Hydrogen Peroxide / Q000633:toxicity; D008937:Mitomycins / Q000494:pharmacology; D010084:Oxidation-Reduction; D013014:SOS Response, Genetics
D002413:Cations, Divalent; D008937:Mitomycins; D001761:Bleomycin; D003300:Copper; D006861:Hydrogen Peroxide
Oksidativnyĭ i SOS-otvety v Escherichia coli i ikh interferentsiia.