Aug, 2003
Hole trapping at N-6-cyclopropyideoxyadenosine suggests a direct contribution of adenine bases to hole transport through DNA
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
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- ,
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- Volume
- 125
- Number
- 34
- First page
- 10154
- Last page
- 10155
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1021/ja035887o
- Publisher
- AMER CHEMICAL SOC
Recent studies predict that adenine radical cation (A•+) contributes to the hole-trapping process through long A/T sequences and exists as a real chemical intermediate. However, the experimental evidence for the existence of A•+ has not been observed in the DNA-mediated hole transport reaction. To examine the direct contribution of A•+, we have developed a novel hole-trapping nucleobase NA6-cyclopropyldeoxyadenosine (dCPA) which possesses a cyclopropyl group as a radical trapping device. One-electron oxidation of dCPA revealed that dCPA radical cation undergoes a rapid cyclopropane ring opening. With the use of the dCPA-containing DNA, we have demonstrated that the migrating hole was trapped at CPA incorporated into a long A/T bridge between two GG sites. The present results indicate that nucleobases possessing ionization potential higher than that of dG, such as dA, are able to participate directly in the multistep hopping mechanism. Copyright © 2003 American Chemical Society.
- Link information
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- DOI
- https://doi.org/10.1021/ja035887o
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000184919600004&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0042933789&origin=inward
- ID information
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- DOI : 10.1021/ja035887o
- ISSN : 0002-7863
- SCOPUS ID : 0042933789
- Web of Science ID : WOS:000184919600004