Dohno, Chikara and Stemp, Eric D. A. and Barton, Jacqueline K. (2003) Fast Back Electron Transfer Prevents Guanine Damage by Photoexcited Thionine Bound to DNA. Journal of the American Chemical Society, 125 (32). pp. 9586-9587. ISSN 0002-7863. doi:10.1021/ja036397z. https://resolver.caltech.edu/CaltechAUTHORS:20160208-162638030
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Abstract
The phenothiazinium dye thionine has a high excited state reduction potential and is quenched by guanine on the femtosecond time scale. Here, we show by gel electrophoresis that irradiation of thionine with 599 nm light in the presence of an oligonucleotide duplex does not produce permanent DNA damage. Upon photoexcitation of thionine weakly associated with guanosine-5‘-monophosphate, the reduced protonated thionine radical and neutral guanine radical are detected by transient absorption spectroscopy, indicating that the quenching of thionine by guanine occurs via an electron-transfer mechanism. The observation of radical formation without permanent guanine damage indicates that fast back electron transfer plays a critical role in governing the yield of damage by DNA-binding molecules.
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| Additional Information: | © 2003 American Chemical Society. Received May 28, 2003. Publication Date (Web): July 22, 2003. We are grateful to the NIH for financial support (GM49216). C.D. also thanks the JSPS for a postdoctoral fellowship. | |||||||||
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| Issue or Number: | 32 | |||||||||
| DOI: | 10.1021/ja036397z | |||||||||
| Record Number: | CaltechAUTHORS:20160208-162638030 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160208-162638030 | |||||||||
| Official Citation: | Fast Back Electron Transfer Prevents Guanine Damage by Photoexcited Thionine Bound to DNA Chikara Dohno, Eric D. A. Stemp, and Jacqueline K. Barton Journal of the American Chemical Society 2003 125 (32), 9586-9587 DOI: 10.1021/ja036397z | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 64321 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 09 Feb 2016 15:48 | |||||||||
| Last Modified: | 10 Nov 2021 23:29 |
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