Misincorporation of nucleotides opposite five-membered exocyclic ring guanine derivatives by escherichia coli polymerases in vitro and in vivo: 1,N2-ethenoguanine, 5,6,7,9-tetrahydro-9-oxoimidazo[1, 2-a]purine, and 5,6,7,9-tetrahydro-7-hydroxy-9-oxoimidazo[1, 2-a]purine.


A variety of exocyclic modified bases have been shown to be formed in DNA from various procarcinogens (e.g., acrolein, malonaldehyde, vinyl chloride, urethan) and are also found in untreated animals and humans, presumably arising as a result of lipid peroxidation. 1, N2-Ethenoguanine (1,N2-epsilon-Gua), a product known to be formed from several 2-carbon… (More)


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