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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1992 Oct 1;89(19):9331–9334. doi: 10.1073/pnas.89.19.9331

Release of N2,3-ethenoguanine from chloroacetaldehyde-treated DNA by Escherichia coli 3-methyladenine DNA glycosylase II.

Z Matijasevic 1, M Sekiguchi 1, D B Ludlum 1
PMCID: PMC50120  PMID: 1409640

Abstract

The human carcinogen vinyl chloride is metabolized in the liver to reactive intermediates which form N2,3-ethenoguanine in DNA. N2,3-Ethenoguanine is known to cause G----A transitions during DNA replication in Escherichia coli, and its formation may be a carcinogenic event in higher organisms. To investigate the repair of N2,3-ethenoguanine, we have prepared an N2,3-etheno[14C]guanine-containing DNA substrate by nick-translating DNA with [14C]dGTP and modifying the product with chloroacetaldehyde. E. coli 3-methyladenine DNA glycosylase II, purified from cells which carry the plasmid pYN1000, releases N2,3-ethenoguanine from chloroacetaldehyde-modified DNA in a protein- and time-dependent manner. This finding widens the known substrate specificity of glycosylase II to include a modified base which may be associated with the carcinogenic process. Similar enzymatic activity in eukaryotic cell might protect them from exposure to metabolites of vinyl chloride.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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