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Volumn 283, Issue 5400, 1999, Pages 375-381

Electron transfer between bases in double helical DNA

Author keywords

[No Author keywords available]

Indexed keywords

ADENINE A2; ADENINE DERIVATIVE; DNA; UNCLASSIFIED DRUG;

EID: 0033555454     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.283.5400.375     Document Type: Article
Times cited : (852)

References (60)
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    • The equally low levels of quenching observed with deoxyinosine triphosphate, deoxyadenosine triphosphate, deoxycytidine triphosphate, and deoxythymidine triphosphate were not sensitive to the redox potentials of these bases (17), and therefore do not appear to be the result of ET.
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    • 2-G reaction because of the significant amount of static quenching, and therefore, the dependence of these quenching yields on distance does not solely reflect β. An analysis of the fluorescence decay data is available www.sciencemag.org/ feature/data/984892.shl as supplementary material.
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    • 3], appropriate amounts of complementary materials were combined at 1:1 stoichiometry and dissolved in 100 mM sodium phosphate (pH 7) to give a final duplex concentration of 100 M. The resulting solutions were heated to 90°C and slowly cooled to ambient temperature over 2 to 3 hours to anneal the duplex. The ultraviolet-visible spectra of the duplex samples were carefully measured to ensure that the absorbance at the excitation wavelength was identical for every sample. Thermal denaturation experiments were performed on a HP8452A diode array spectrophotometer with samples at a duplex concentration of 25 μM in 100 mM phosphate (pH 7). Absorbance was monitored every 2°C with 3-min equilibration times. All duplexes used in these experiments exhibited cooperative thermal denaturation profiles with melting temperatures >25°C with 25 μM duplex and therefore were fully hybridized under the conditions of all fluorescence experiments (100 μM, 20°C).
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    • ε. Two data sets were obtained for each sample, one containing >10,000 counts for the determination of decay lifetimes, and another taken over a 120-s time interval to quantitate static quenching. Experiments were otherwise performed under the same conditions as steady-state experiments (100 μM duplex, 100 mM sodium phosphate, pH 7).
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    • We thank E. Stemp for assistance with transient absorption experiments, R. Villahermosa for assistance with single-photon counting measurements, and T. Fiebig for discussions and assistance with molecular modeling. In addition, we acknowledge the NIH (grant GM49216 to J.K.B., predoctoral traineeship to S.O.K.) for financial support.


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