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• W2040395311 abstract "CoASAc-dependent N-hydroxyarylamine O-acetyltransferase (OAT) is an enzyme involved in the intracellular metabolic activation of N-hydroxyarylamines derived from mutagenic nitroarenes and aromatic amines. The oat gene encoding the enzyme of S. typhimurium TA98 and TA100 was specifically disrupted and the sensitivities of the resulting strains, i.e., YG7130 and YG7126, to mutagens were compared with those of the conventional oat-deficient strains, i.e., TA98/1,8DNP6 and TA100/1,8DNP, respectively. The new oat-deficient strains and the conventional strains exhibited similar sensitivity against most of the chemicals tested: both strains YG7130 and strain TA98/1,8-DNP6 were resistant to mutagenicity by 1,8-dinitropyrene (1,8-DNP), 1-nitropyrene, 2-amino-6-methyldipyrido[1,2-α:3′,2′-d]imidazole (Glu-P-1) and 2-amino-3-methyl-3H-imidazo[4,5-f]quinoline (IQ); neither strain YG7130 nor strain TA98/1,8-DNP6 was resistant to the mutagenicity of 3-amino-1-methyl-5H-pyrido[4,3-b]indole (Trp-P-2); strain YG7126 and strain TA100/1,8-DNP were refractory to the mutagenicity of 1,8-DNP. However, the order of the sensitivity against 2-nitrofluorene (2-NF) was TA98>YG7130>TA98/1,8-DNP6 and TA100>YG7126>TA100/1,8-DNP. Since the strains YG7130 and YG7126 have chloramphenicol resistance (Cmr) gene in place of the chromosomal oat gene for gene disruption, the possible involvement of chloramphenicol acetyltransferase (CAT) encoded by the Cmr gene in the activation of 2-NF was examined. Strikingly, introduction of plasmid pACYC184 carrying the Cmr gene alone substantially enhanced the sensitivity of the conventional oat-deficient strains to 2-NF. These results suggest that the new strains as well as the conventional strains are useful to assess the roles of OAT in the metabolic activation of nitroaromatics and aromatic amines in S. typhimurium, and also that CAT has the ability to activate N-hydroxy aromatic amines to mutagens." @default.
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• W2040395311 date "1999-02-01" @default.
• W2040395311 modified "2023-10-17" @default.
• W2040395311 title "New O-acetyltransferase-deficient Ames Salmonella strains generated by specific gene disruption" @default.
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• W2040395311 doi "https://doi.org/10.1016/s1383-5718(98)00189-2" @default.
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