Download MendeleyStructure of DNA Polymerase beta with the Mutagenic DNA Lesion 8-oxodeoxyguanine Reveals Structural Insights into its Coding Potential
Krahn, J.M., Beard, W.A., Miller, H., Grollman, A.P., Wilson, S.H.(2003) Structure 11: 121-127
- PubMed: 12517346
- DOI: https://doi.org/10.1016/s0969-2126(02)00930-9
- Primary Citation of Related Structures:
1MQ2, 1MQ3 - PubMed Abstract:
Oxidative damage to DNA generates 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG). During DNA replication and repair synthesis, 8-oxodG can pair with cytosine or adenine. The ability to accurately replicate through this lesion depends on the DNA polymerase. We report the first structure of a polymerase with a promutagenic DNA lesion, 8-oxodG, in the confines of its active site. The modified guanine residue is in an anti conformation and forms Watson-Crick hydrogen bonds with an incoming dCTP. To accommodate the oxygen at C8, the 5'-phosphate backbone of the templating nucleotide flips 180 degrees. Thus, the flexibility of the template sugar-phosphate backbone near the polymerase active site is one parameter that influences the anti-syn equilibrium of 8-oxodG. Our results provide insights into the mechanisms employed by polymerases to select the complementary dNTP.
Organizational Affiliation:
Laboratory of Structural Biology, National Institute of Environmental Health Sciences, NIH, P.O. Box 12233, Research Triangle Park, NC 27709, USA.
