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M404332200v1
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Papers In Press, published online ahead of print June 21, 2004
J. Biol. Chem, 10.1074/jbc.M404332200
Submitted on April 19, 2004
Revised on June 16, 2004
Accepted on June 21, 2004

The spacious active site of a Y-family DNA polymerase facilitates promiscuous nucleotide incorporation opposite a bulky carcinogen-DNA Adduct: Elucidating the structure-function relationship through experimental and computational approaches

Rebecca A. Perlow-Poehnelt, Ilya Likhterov, David A. Scicchitano, Nicholas E. Geacintov, and Suse Broyde

Biology Dept., New York University, New York, NY 10003

Corresponding Author: broyde{at}nyu.edu

Y-family DNA polymerases lack some of the mechanisms that replicative DNA polymerases employ to ensure fidelity, resulting in higher error rates during replication of undamaged DNA templates and the ability to bypass certain aberrant bases, such as those produced by exposure to carcinogens, including benzo[a]pyrene (BP). A tumorigenic metabolite of BP, (+)-anti-benzo[a]pyrene diol epoxide, attacks DNA to form the major 10S(+)-trans-anti-[BP]-N2-dG adduct, which has been shown to be mutagenic in a number of prokaryotic and eukaryotic systems. The 10S(+)-trans-anti-[BP]-N2-dG adduct can cause all three base substitution mutations, and the SOS response in E. coli increases bypass of bulky adducts, suggesting that Y-family DNA polymerases are involved in the bypass of such lesions. Dpo4 belongs to the DinB branch of the Y-family, which also includes E. coli pol IV and eukaryotic pol kappa . We carried out primer-extension assays in conjunction with molecular modeling and molecular dynamics studies in order to elucidate the structure-function relationship involved in nucleotide incorporation opposite the bulky 10S(+)-trans-anti-[BP]-N2-dG adduct by Dpo4. Dpo4 is able to bypass the 10S(+)-trans-anti-[BP]-N2-dG adduct, albeit to a lesser extent than unmodified guanine, and the Vmax values for insertion of all four nucleotides opposite the adduct by Dpo4 are similar. Computational studies suggest that 10S(+)-trans-anti-[BP]-N2-dG can be accommodated in the active site of Dpo4 in either the anti or syn conformation due to the limited protein-DNA contacts and the open nature of both the minor and major groove sides of the nascent base pair.


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