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- W2087907435 abstract "The development of photoaffinity probes to characterize the binding process and subsequent biological activity of a drug has recently been emphasized by the synthesis of two ethidium azide analogs. The initial finding showed that one of the azido analogs, the 8-azido-3-amino derivative, was at least 40-fold more mutagenic and toxic in Salmonella tester strain TA1538 than the other analog, the 3.8-diazido derivative. These observations suggested the need to examine the structural requirements of ethidium photoaffinity labels for frameshift mutagenic activity in Salmonella. Thus, the isomer of the monoazide, the 3-azido-8-amino derivative, and two deaminated monoazide derivatives were synthesized and all of the ethidium analogs were screened in two Salmonella frameshift tester strains, TA1537 and TA1538, and in their excision-repair positive isogenic strains. The results presented in this paper demonstrate that two substituents are needed to produce significant mutagenicity and toxicity by the compound. One substituent, usually the amino group, is required for mutagenic activity, perhaps by orienting the phenanthridinium ring into its mutagenic configuration. The other substituent, the azido group, is required for covalent attachment, a requisite for mutagenic activity. Thus, photoaffinity labeling has provided a means of comparing structure with mutagenic activity for ethidium compounds." @default.
- W2087907435 created "2016-06-24" @default.
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- W2087907435 date "1980-07-01" @default.
- W2087907435 modified "2023-09-28" @default.
- W2087907435 title "Structure-function characterization for ethidium photoaffinity labels as mutagens in salmonella" @default.
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- W2087907435 doi "https://doi.org/10.1016/0027-5107(80)90067-6" @default.
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