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Science 19 November 1993:
Vol. 262. no. 5137, pp. 1247 - 1249
DOI: 10.1126/science.8235654
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Articles

Science, Vol 262, Issue 5137, 1247-1249
Copyright © 1993 by American Association for the Advancement of Science

articles

Effective coupling in biological electron transfer: exponential or complex distance dependence?

JW Evenson and M Karplus

Department of Chemistry, Harvard University, Cambridge, MA 02138.

Calculations for a simple model electron transfer system and tuna cytochrome c demonstrate a dichotomy in the distance dependence of the effective coupling. In one regime, the effective coupling varies exponentially with distance and depends primarily on the average properties of the bridging material; in the other regime, the effective coupling has a complex distance dependence and is more sensitive to the details of the bridging material. Experiments and theory indicate that both regimes may occur in biological systems, providing a perspective on a recent controversy over the nature of the distance dependence.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)