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Previously, in a random mutagenesis study, the (+)-anti diol epoxide of benzo[a]pyrene [(+)-anti-B[a]PDE] was shown to induce a complex mutational spectrum in the supF gene of an Escherichia coli plasmid, which included insertions, deletions and base substitution mutations, notably a significant fraction of GC--&gt;TA, GC--&gt;AT and GC--&gt;CG mutations. At some sites, a single type of mutation dominated and to understand individual mutagenic pathways these sites were chosen for study by site-specific means to determine whether the major adduct, [+ta]-B[a]P-N2-dG, was responsible. [+ta]-B[a]P-N2-dG was shown to induce approximately 95% G--&gt;T mutations in a 5'-TGC-3' sequence context and approximately 80% G--&gt;A mutations in a 5'-CGT-3' sequence context. (+)-anti-B[a]PDE induced principally GC--&gt;CG mutations in the G133 sequence context (5'-AGA-3') in studies using both SOS-uninduced or SOS-induced E. coli. Herein, [+ta]-B[a]P-N2-dG is shown to induce principally G--&gt;A mutations (&gt;90%) either without or with SOS induction in a closely related 5'-AGA-3' sequence context (identical over 7 bp). This is the first time that there has been a discrepancy between the mutagenic specificity of (+)-anti-B[a]PDE versus [+ta]-B[a]P-N2-dG. Eight explanations for this discordance are considered. Four are ruled out; e.g. the second most prevalent adduct [+ca]-B[a]P-N2-dG also induces a preponderance of G--&gt;A mutations (&gt;90%), so it also is not responsible for (+)-anti-B[a]PDE-induced G133--&gt;C mutations. The four explanations not ruled out are discussed and include that another minor adduct might be responsible and that the 5'-AGA-3' sequence context differed slightly in the studies with [+ta]-B[a]P-N2-dG versus (+)-anti-B[a]PDE. In spite of the discordance, [+ta]-B[a]P-N2-dG induces G--&gt;A mutations in the context studied herein and this result has proven useful in generating a hypothesis for what conformations of [+ta]-B[a]P-N2-dG are responsible for G--&gt;T versus G--&gt;A mutations.

The major, N2-dG adduct of (+)-anti-B[a]PDE induces G->A mutations in a 5'-AGA-3' sequence context