We measured the genotoxic activities in two bacterial tests, the Salmonella/histidine assay (a reverse mutation assay) and the SOS chromotest (an assay for SOS induction in E. coli), of three 2-nitroanthrafurans: 2-nitroanthra[1,2-b]furan (R-7688), the isomeric compound 2-nitroanthra[2,1-b]furan (R-7686) and its
The mutagenic specificity of 7-methoxy-2-nitronaphtho[2,1-b]furan (R7000), a very potent genotoxic 2-nitrofuran, was investigated in the lacI gene of E.coli. To analyze the influence of SOS-mutagenesis on R7000-induced mutations, 86 and 84 LacI- mutants were respectively isolated from umuC+ and umuC
The effects on DNA, in bacteria, of 7-methoxy-2-nitro-naphtho[2,1-b]furan (R7000), a very potent genotoxic product from the 2-nitronaphthofuran series, were investigated with two different approaches: (i) measurement of the binding of the radiolabelled mutagen to DNA and (ii) detection by the
The characterization of target nucleotides involved in the binding to DNA of 7-methoxy-2-nitro-naphtho[2,1-b]furan (R7000), a very potent genotoxic nitrofuran derivative, was investigated. Since R7000 undergoes metabolic activation prior to interacting with DNA, plasmids containing AT-rich and GC-rich sequences were devised
The influence of the uvr-dependent excision repair system on the lethal action, mutagenic specificity, SOS induction and DNA adducts formation of 7-methoxy-2-nitronaphtho[2,1-b]furan (R7000), a potent genotoxic nitrofuran, were examined in Escherichia coli. Binding measurements of 3H-labelled R7000 to DNA indicated
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