Issue 34, 2009

Gated electron transfer of cytochromec6 at biomimetic interfaces: a time-resolved SERR study

Abstract

The electron shuttle heme protein Cyt-c6 from the photosynthetic cyanobacteriumNostoc sp. PCC 7119 was immobilized on nanostructured Ag electrodes coated with SAMs that mimic different possible interactions with its natural reaction partner PSI. The structure, redox potential, and electron-transfer dynamics of the SAM–Cyt-c6 complexes were investigated by TR-SERR spectroelectrochemistry. It is shown that the heterogeneous electron-transfer process is gated both in electrostatic and hydrophobic–hydrophilic complexes. At long tunneling distances, the reaction rate is controlled by the tunneling probability, while at shorter distances or higher driving forces, protein dynamics becomes the rate-limiting event.

Graphical abstract: Gated electron transfer of cytochromec6 at biomimetic interfaces: a time-resolved SERR study

Supplementary files

Article information

Article type
Paper
Submitted
04 Mar 2009
Accepted
30 Apr 2009
First published
01 Jun 2009

Phys. Chem. Chem. Phys., 2009,11, 7390-7397

Gated electron transfer of cytochromec6 at biomimetic interfaces: a time-resolved SERR study

A. Kranich, H. Naumann, F. P. Molina-Heredia, H. J. Moore, T. R. Lee, S. Lecomte, M. A. de la Rosa, P. Hildebrandt and D. H. Murgida, Phys. Chem. Chem. Phys., 2009, 11, 7390 DOI: 10.1039/B904434E

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