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Opening dynamics of 8-oxoguanine in DNA.
MedLine Citation:
PMID:  23456741     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
8-oxoguanine is a major lesion of genomic DNA that results from oxidation of guanine by reactive oxygen species. The repair of this lesion is initiated by 8-oxoguanine glycosylases, which excise the damaged base by "flipping" it outside the DNA double helix. The molecular mechanisms involved in the specific recognition of the damaged base by the enzyme are not yet fully understood. Several models have proposed that, in DNA, the base pair between 8-oxoguanine and cytosine may possess altered dynamic properties that could help the enzyme locate the lesion and could favor the selective extra-helical flipping of the damaged base. To test this proposal, we have characterized the spontaneous opening of the base pair between 8-oxoguanine and cytosine in a DNA double helix using NMR spectroscopy and proton exchange. The results show that the rate of spontaneous opening of 8-oxoguanine and the lifetime of the base in the extra-helical state are the same as those of a canonical guanine-cytosine base pair, in the same base sequence context. This finding suggests that the opening dynamics of 8-oxoguanine, when paired with cytosine in DNA, does not play a significant role in the recognition of the lesion by glycosylases. Copyright © 2013 John Wiley & Sons, Ltd.
Authors:
Alicia E Every; Irina M Russu
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of molecular recognition : JMR     Volume:  26     ISSN:  1099-1352     ISO Abbreviation:  J. Mol. Recognit.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-03-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9004580     Medline TA:  J Mol Recognit     Country:  England    
Other Details:
Languages:  eng     Pagination:  175-80     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 John Wiley & Sons, Ltd.
Affiliation:
Department of Chemistry and Molecular Biophysics Program, Wesleyan University, Middletown, CT, 06459, USA; Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT, 06250, USA.
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