Further characterization of SOS system induction in recBC mutants of Escherichia coli

Jorge Barbé, J. Albert Vericat, Jorge Cairó, Ricardo Guerrero

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24 Citations (Scopus)

Abstract

Expression of several SOS functions such as induction of lambda prophage, inhibition of cell division and induction of both umuC and recA genes after UV-irradiation, nalidixic acid or mitomycin C addition was studied in an RecBC- mutant. UV-irradiation and mitomycin C induced all SOS functions studied in the RecBC- cells but at a lower level and delayed with respect to the wild-type strain. On the contrary, nalidixic acid was unable to trigger any of these SOS functions. In the RecBC- mutant, adenine only had a stimulating effect on the amplification of RecA protein synthesis following UV-irradiation. Nevertheless, in the wild-type strain the stimulating effect occurred in all SOS functions studied following UV-irradiation as well as in the amplification of RecA protein synthesis by nalidixic acid but not in the other SOS functions triggered by this compound. Furthermore, adenine produced a decrease in the mitomycin C-mediated induction of all SOS functions studied in both RecBC- and wild-type strains. © 1985.
Original languageEnglish
Pages (from-to)23-32
JournalMutation Research DNA Repair Reports
Volume146
DOIs
Publication statusPublished - 1 Jan 1985

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