Cellular determinants of the mutational specificity of 1-nitroso-6-nitropyrene and 1-nitroso-8-nitropyrene in the lacI gene of Escherichia coli

Lambert, Iain B.; Carroll, C.; Laycock, N.; Koziarz, Jacob; Lawford, I.; Duval, Linda; Turner, Gail N.; Booth, Ronald A.; Douville, S.; Whiteway, J.; Nokhbeh, M.R.

doi:10.1016/s0027-5107(01)00234-2

Cited by 4 publications

(1 citation statement)

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“…The mutagenicity was RecA-dependent and enhanced by defective excision repair. It was also enhanced by mucAB in pKM101, but was independent of the umuC gene product [MacPhee and Liaskou, 1989], suggesting differential effects of PolRI and PolV, as have been reported in other studies [O'Grady et al, 2000;Lambert et al, 2001]. The 1-and 4-nitro isomers were potent recombinagens in yeast, whereas the 2-and 3-nitro isomers were weakly active, and DAPA was inactive or nearly so [Ferguson and Turner, 1987b].…”

Section: Discussionsupporting

confidence: 71%

Frameshift mutations induced by four isomeric nitroacridines and their des-nitro counterpart in thelacZ reversion assay inEscherichia coli

Hoffmann

Yin

Terry

et al. 2006

Environ. Mol. Mutagen.

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Acridines are well-known as compounds that intercalate noncovalently between DNA base pairs and induce +/-1 frameshift mutations at sites of monotonous repeats of a single base. Reactive derivatives of acridines, including acridine mustards and nitroacridines, form covalent adducts in DNA and exhibit mutagenic properties different from the simple intercalators. We compared the frameshift mutagenicity of the cancer chemotherapy drug nitracrine (1-nitro-9-(3'-dimethylaminopropylamino)-acridine), its des-nitro counterpart 9-(3'-dimethylaminopropylamino)-acridine (DAPA), and its 2-, 3-, and 4-nitro isomers (2-, 3-, and 4-nitro-DAPA) in the lacZ reversion assay in Escherichia coli. DAPA is a simple intercalator, much like the widely studied 9-aminoacridine. It most strongly induced +/-1 frameshift mutations in runs of guanine residues and more weakly induced -1 frameshifts in a run of adenine residues. A nitro group in the 1, 3, or 4 position of DAPA reduced the yield of +/-1 frameshift mutations. DAPA weakly induced -2 frameshifts in an alternating CG sequence. In contrast, nitracrine and its 3-nitro isomer resembled the 3-nitroacridine Entozon in effectively inducing -2 frameshift mutations. The 2- and 4-nitro isomers were less effective than the 1- and 3-nitro compounds in -2 frameshift mutagenesis. The results are interpreted with respect to intercalation, steric interactions, effects of base strength on DNA binding, enzymatic processing, and a slipped mispairing model of frameshift mutagenesis.

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Section: Discussionsupporting

confidence: 71%