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Electrochemically induced FTIR difference spectroscopy in the mid‐ to far infrared (200 μm) domain: A new setup for the analysis of metal–ligand interactions in redox proteins
Author(s) -
Berthomieu Catherine,
Marboutin Laure,
Dupeyrat François,
Bouyer Pierre
Publication year - 2006
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.20469
Subject(s) - chemistry , redox , fourier transform infrared spectroscopy , raman spectroscopy , analytical chemistry (journal) , infrared , infrared spectroscopy , resonance raman spectroscopy , spectroscopy , ligand (biochemistry) , photochemistry , metal , inorganic chemistry , optics , organic chemistry , quantum mechanics , biochemistry , receptor , physics
We report the setup of an electrochemical cell with chemical–vapor deposition diamond windows and the use of a Bruker 66 SX FTIR spectrometer equipped with DTGS and Si‐bolometer detectors and KBr and mylar beam splitters, to record on the same sample, FTIR difference spectra corresponding to the structural changes associated with the change in redox state of active sites in proteins in the whole 1800–50 cm –1 region. With cytochrome c we show that reliable reduced‐minus‐oxidized FTIR difference spectra are obtained, which correspond to single molecular vibrations. Redox‐sensitive IR modes of the cytochrome c are detected until 140 cm –1 with a good signal to noise. This new setup is promising to analyze the infrared spectral region where metal–ligand vibrations are expected to contribute and to extend the analysis of vibrational properties to metal sites or redox states not accessible to (resonance) Raman spectroscopy. © 2006 Wiley Periodicals, Inc. Biopolymers 82: 363–367, 2006 This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com