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H2O2-induced cross-protection against UV-C killing in Escherichia coli is blocked in a lexA (Def) background
L M Asad1, A A de Carvalho, I Felzenszwalb
1Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, RJ, Brazil.
Journal of Photochemistry and Photobiology. B, Biology
|March 30, 2000
Abstract:
Pretreatment with 2.5 mM H2O2 protects E. coli cells against UV-C killing, a phenomenon independent of LexA cleavage. In this paper, we observe that this cross-protection response is neither dependent on the dinY gene product nor on the system that controls dinY, since H2O2 is able to induce cross-protection but not to induce the dinY gene in a lexA-noninducible strain [lexA (Ind-)]. Moreover, this response is not induced in a lexA (Def) background, suggesting that the expression of the SOS regulon may inhibit this cross-protection response.