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Erschienen in:
2009 | OriginalPaper | Buchkapitel
The Kinetics of Charge Recombination in DNA Hairpins Controlled by Counterions
verfasst von : Gail S. Blaustein, Frederick D. Lewis, Alexander L. Burin, Rajesh Shrestha
Erschienen in: Computational Science – ICCS 2009
Verlag: Springer Berlin Heidelberg
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The charge recombination rate in DNA hairpins is investigated. The distance dependence for the charge recombination rate between stilbene donor (Sd
+
) and stilbene acceptor (Sa
−
) linkers separated by an AT bridge has a double exponential form. We suggest that this dependence is associated with two tunneling channels distinguished by the presence or absence of the Cl
−
counterion bound to Sd
+
. Experiment-based estimates of counterion binding parameters agree within reasonable expectations. A control experiment replacing the Cl
−
ion with other halide ions is suggested. Counterion substitution allows modification of the charge recombination rate in either direction by orders of magnitude.