Abstract
A transmembrane helix surrounded by detergent molecules close to the surface electron relay is shown, by electrochemical, AFM, and PM-IRRAS studies, to control the orientation of a membrane-bound [NiFe] hydrogenase on electrochemical interfaces. Hence, H2 oxidation proceeds as a mixture of direct (DET) and mediated electron transfer (MET) on hydrophilic interfaces, but by a MET process on hydrophobic interfaces (see picture).
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