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Science 16 March 2007:
Vol. 315. no. 5818, pp. 1565 - 1568
DOI: 10.1126/science.1135844
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Reports

A Cytochrome c Oxidase Model Catalyzes Oxygen to Water Reduction Under Rate-Limiting Electron Flux

James P. Collman,* Neal K. Devaraj, Richard A. Decréau, Ying Yang, Yi-Long Yan, Wataru Ebina, Todd A. Eberspacher, Christopher E. D. Chidsey*

We studied the selectivity of a functional model of cytochrome c oxidase's active site that mimics the coordination environment and relative locations of Fea3, CuB, and Tyr244. To control electron flux, we covalently attached this model and analogs lacking copper and phenol onto self-assembled monolayer–coated gold electrodes. When the electron transfer rate was made rate limiting, both copper and phenol were required to enhance selective reduction of oxygen to water. This finding supports the hypothesis that, during steady-state turnover, the primary role of these redox centers is to rapidly provide all the electrons needed to reduce oxygen by four electrons, thus preventing the release of toxic partially reduced oxygen species.

Department of Chemistry, Stanford University, Stanford, CA 94305–5080, USA.

* To whom correspondence should be addressed. E-mail: jpc{at}stanford.edu (J.P.C.); chidsey{at}stanford.edu (C.E.D.C.)

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