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Nat Struct Mol Biol. 2010 Jul;17(7):889-90. doi: 10.1038/nsmb.1852. Epub 2010 Jun 6.

Mutagenic conformation of 8-oxo-7,8-dihydro-2'-dGTP in the confines of a DNA polymerase active site.

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1
Laboratory of Structural Biology, National Institute of Environmental Health Sciences, US National Institutes of Health, Research Triangle Park, North Carolina, USA.

Abstract

The major product of oxidative base damage is 8-oxo-7,8-dihydro-2'-deoxyguanine (8odG). The coding potential of this lesion is modulated by its glycosidic torsion angle that controls whether its Watson-Crick or Hoogsteen edge is used for base pairing. The 2.0-A structure of DNA polymerase (pol) beta bound with 8odGTP opposite template adenine indicates that the modified nucleotide assumes the mutagenic syn conformation and that the nonmutagenic anti conformation would be incompatible with efficient DNA synthesis.

PMID:
20526335
PMCID:
PMC2921931
DOI:
10.1038/nsmb.1852
[Indexed for MEDLINE]
Free PMC Article
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