Dissecting the differences between the alpha and beta anomers of the oxidative DNA lesion FaPydG.

Published

Journal Article

The oxidative DNA lesion, FaPydG rapidly anomerizes to form a mixture of the alpha and beta anomer. To investigate the mutagenic potential of both forms, we prepared stabilized bioisosteric analogues of both configurational isomers and incorporated them into oligonucleotides. These were subsequently used for thermodynamic melting-point studies and for primer-extension experiments. While the beta compound, in agreement with earlier data, prefers cytidine as the pairing partner, the alpha compound is not able form a stable base pair with any natural base. In primer-extension studies with the high-fidelity polymerase Bst Pol I, the polymerase was able to read through the lesion. The beta compound showed no strong mutagenic potential. The alpha compound, in contrast, strongly destabilized DNA duplexes and also blocked all of the tested DNA polymerases, including two low-fidelity polymerases of the Y-family.

Full Text

Duke Authors

Cited Authors

  • Büsch, F; Pieck, JC; Ober, M; Gierlich, J; Hsu, GW; Beese, LS; Carell, T

Published Date

  • 2008

Published In

Volume / Issue

  • 14 / 7

Start / End Page

  • 2125 - 2132

PubMed ID

  • 18196510

Pubmed Central ID

  • 18196510

International Standard Serial Number (ISSN)

  • 0947-6539

Digital Object Identifier (DOI)

  • 10.1002/chem.200701373

Language

  • eng

Conference Location

  • Germany