The present study surveys a novel approach to studies of membrane proteins whose catalytic action is driven by the redox potential or by the membrane potential. We introduce SEIRAS (surface-enhanced IR absorption spectroscopy) to probe a monolayer of membrane protein adhered to the surface of a gold electrode. SEIRAS renders high surface sensitivity by enhancing the signal of the adsorbed molecule by approximately two orders of magnitude. It is demonstrated that reaction-induced spectroscopy is applicable by recording IR differences of cytochrome c after stimulation by the electrical potential. The impact of the membrane potential on the function of a membrane protein is demonstrated by performing light-induced difference spectroscopy on a microbial rhodopsin (sensory rhodopsin II) under voltage-clamp conditions. The methodology presented opens new avenues to study the mechanism of electron-triggered and voltage-gated proteins at the level of single bonds. As many of these catalytic reactions are of vectorial nature, control on the orientation of the membrane protein is mandatory. Approaches are presented on how to specifically adhere photosynthetic and respiratory proteins to the electrode surface and reconstitute these membrane proteins in the lipid bilayer. Functionality of such biomimetic systems is assessed in situ by spectro-electrochemical methods.
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October 2008
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Conference Article|
September 19 2008
Bioenergetics at the gold surface: SEIRAS probes photosynthetic and respiratory reactions at the monolayer level
Kenichi Ataka;
Kenichi Ataka
1Biophysical Chemistry, Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
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Joachim Heberle
Joachim Heberle
1
1Biophysical Chemistry, Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
1To whom correspondence should be addressed (email [email protected]).
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Publisher: Portland Press Ltd
Received:
June 11 2008
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© The Authors Journal compilation © 2008 Biochemical Society
2008
Biochem Soc Trans (2008) 36 (5): 986–991.
Article history
Received:
June 11 2008
Citation
Kenichi Ataka, Joachim Heberle; Bioenergetics at the gold surface: SEIRAS probes photosynthetic and respiratory reactions at the monolayer level. Biochem Soc Trans 1 October 2008; 36 (5): 986–991. doi: https://doi.org/10.1042/BST0360986
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