Effect of genotype on mutagenicity of niridazole in nitroreductase-deficient bacteria.

W T Speck, J L Blumer, E J Rosenkranz, H S Rosenkranz

Cancer research 1981 Jun

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The mutagenicity of niridazole for Salmonella typhimurium depends upon the enzymic reduction of the nitro function. The response of niridazole nitroreductase-deficient bacteria to niridazole is reduced to 4.4 and 0.19% that exhibited by the enzyme-proficient parent strain when the deficiency is the result of a base substitution and frame-shift mutation, respectively. The results are taken to indicate that the residual activity (4.4%) seen in the strain with a base substitution mutation reflects the activity of an enzyme with an amino acid substitution, while the basal level (0.19%) of activity indicates the action of a different nitroreductase with a low specificity for niridazole.

Citation

W T Speck, J L Blumer, E J Rosenkranz, H S Rosenkranz. Effect of genotype on mutagenicity of niridazole in nitroreductase-deficient bacteria. Cancer research. 1981 Jun;41(6):2305-7