Natural engineering principles of electron tunnelling in biological oxidation–reduction

Christopher C. Page, Christopher C. Moser, Xiaoxi Chen and P. Leslie Dutton ()
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Christopher C. Page: Johnson Research Foundation, University of Pennsylvania
Christopher C. Moser: Johnson Research Foundation, University of Pennsylvania
Xiaoxi Chen: Johnson Research Foundation, University of Pennsylvania
P. Leslie Dutton: Johnson Research Foundation, University of Pennsylvania

Nature, 1999, vol. 402, issue 6757, 47-52

Abstract: Abstract We have surveyed proteins with known atomic structure whose function involves electron transfer; in these, electrons can travel up to 14 Å between redox centres through the protein medium. Transfer over longer distances always involves a chain of cofactors. This redox centre proximity alone is sufficient to allow tunnelling of electrons at rates far faster than the substrate redox reactions it supports. Consequently, there has been no necessity for proteins to evolve optimized routes between redox centres. Instead, simple geometry enables rapid tunnelling to high-energy intermediate states. This greatly simplifies any analysis of redox protein mechanisms and challenges the need to postulate mechanisms of superexchange through redox centres or the maintenance of charge neutrality when investigating electron-transfer reactions. Such tunnelling also allows sequential electron transfer in catalytic sites to surmount radical transition states without involving the movement of hydride ions, as is generally assumed. The 14 Å or less spacing of redox centres provides highly robust engineering for electron transfer, and may reflect selection against designs that have proved more vulnerable to mutations during the course of evolution.

Date: 1999
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DOI: 10.1038/46972

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