PMID: 8601760Jan 1, 1996Paper

Thiols, recA induction and radiosensitivity in Escherichia coli

International Journal of Radiation Biology
M NäslundL Ehrenberg

Abstract

Induction by gamma-radiation, UV radiation or hydroxyurea of RecA gene product synthesis in Escherichia coli, monitored as beta-D-galactosidase in recA-lacZ fusion strains, was shown to be inhibited if 2-mercaptoethylamine (MEA) was added before treatment with the inducing agents. If cysteine (Cys) at low concentrations was added at the same time as MEA it counteracted the action of MEA. The effect of MEA may be described as a competitive inhibition of an inducing or conducting effect of Cys. In E. coli GE499 (uvrA+), complete inhibition by 30-mmol dm-3 MEA of recA induction was associated with about five times higher radio-resistence. Both of these effects of MEA were completely reversed by 0.3-mmol dm-3 Cys. As shown in parallel experiments with E. coli GE500 (uvrA-), these effects of MEA and Cys were shown to be independent of excision-repair proficiency. Treatment of bacteria with MEA and/or Cys was shown not to lead to increased intracellular concentrations of these thiols. Instead, treatment with them appeared to provoke conspicuous increases in glutathione levels, which are, however, probably not directly involved in the studied action of MEA and Cys.

References

Jul 6, 1978·Molecular & General Genetics : MGG·S E BreslerN A Kuzovleva
Jun 1, 1976·International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine·M NäslundL Ehrenberg
Jul 1, 1992·Mutation Research·M NäslundL Ehrenberg
Feb 1, 1991·Proceedings of the National Academy of Sciences of the United States of America·T KalebicA S Fauci
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Mar 1, 1986·Mutation Research·M NäslundL Ehrenberg
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Nov 1, 1971·Journal of General Microbiology·C KariF Hernádi
May 1, 1971·Biochemical Pharmacology·C KariF Hernádi

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Citations

Oct 12, 2000·Pharmacological Research : the Official Journal of the Italian Pharmacological Society·I G Kim, T J Oh

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