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Evidence for DNA Charge Transport in the Nucleus

Núñez, Megan E. and Holmquist, Gerald P. and Barton, Jacqueline K. (2001) Evidence for DNA Charge Transport in the Nucleus. Biochemistry, 40 (42). pp. 12465-12471. ISSN 0006-2960. doi:10.1021/bi011560t.

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Oxidative damage to DNA bases in isolated HeLa nuclei occurs upon treatment with rhodium intercalators and photoactivation. Oxidation occurs preferentially at the 5‘-guanine of 5‘-GG-3‘ sites, indicative of base damage by DNA-mediated charge transfer chemistry. Moreover, oxidative damage occurs at protein-bound sites which are inaccessible to rhodium. Thus, on transcriptionally active DNA within the cell nucleus, DNA-mediated charge transport leads to base damage from a distance, and direct interaction of an oxidant is not necessary to generate a base lesion at a specific site. These observations require consideration in designing new chemotherapeutics and in understanding cellular mechanisms for DNA damage and repair.

Item Type:Article
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Barton, Jacqueline K.0000-0001-9883-1600
Additional Information:© 2001 American Chemical Society. Received July 26, 2001. Publication Date (Web): September 27, 2001. We thank Ning Ye, Shu-mei Dai, and Steven Bates for their technical assistance, Timothy O'Connor for the Fapy/EndoIII enzyme mixture, and Daniel Hall and Katherine Noyes for their help with the synthesis of Rh(phi)_2DMB^(3+). This work was supported by a grant from the NIH (GM49216) as well as funding from the National Foundation for Cancer Research and the Howard Hughes Medical Institute predoctoral fellowship program (M.E.N.).
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National Foundation for Cancer ResearchUNSPECIFIED
Howard Hughes Medical Institute (HHMI)UNSPECIFIED
Issue or Number:42
Record Number:CaltechAUTHORS:20160209-160226905
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Official Citation:Evidence for DNA Charge Transport in the Nucleus Megan E. Núñez, Gerald P. Holmquist, and Jacqueline K. Barton Biochemistry 2001 40 (42), 12465-12471 DOI: 10.1021/bi011560t
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64351
Deposited By: George Porter
Deposited On:10 Feb 2016 16:08
Last Modified:10 Nov 2021 23:29

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