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Conformations of DNA duplexes containing 8-oxoguanine
V I Poltev1, S L Smirnov, O V Issarafutdinova
1Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region.
Journal of Biomolecular Structure & Dynamics
|October 1, 1993
Summary
8-oxoguanine (OG) incorporation into DNA can cause mutations. Molecular modeling reveals that OG mispairs cause minor DNA distortions, suggesting G to OG conversion is key in DNA damage from oxidation or irradiation.
Area of Science:
- Molecular biology
- Biochemistry
- Genetics
Background:
- Oxidative stress and irradiation can damage DNA.
- 8-oxoguanine (OG) is a common oxidative DNA lesion.
- Understanding OG's mutagenic potential is crucial.
Purpose of the Study:
- To investigate the structural consequences of incorporating 8-oxoguanine (OG) into DNA duplexes.
- To elucidate the role of OG mispairing in DNA mutagenesis.
- To assess the impact of OG on DNA conformational parameters.
Main Methods:
- Utilizing molecular modeling techniques.
- Analyzing DNA sequences with central 8-oxoguanine (OG) mispairs.
- Evaluating changes in DNA conformational parameters.
Main Results:
- G:C to OG:C replacements cause minor DNA conformational changes, similar to natural sequence variations.
- OG mispairs, such as OG(syn):G and OG(syn):A, can be incorporated without significant backbone distortion.
- The extent of DNA distortion caused by OG mispairs is sequence-dependent.
Conclusions:
- The conversion of guanine (G) to 8-oxoguanine (OG) is a significant factor in DNA damage.
- OG incorporation can lead to mutagenesis through subtle DNA structural alterations.
- These findings contribute to understanding DNA repair mechanisms and mutagenesis pathways.