2D-SEIRA spectroscopy to highlight conformational changes of the cytochrome c oxidase induced by direct electron transfer

作者：Nowak Christoph; Laredo Thamara; Gebert Jens; Lipkowski Jacek; Gennis Robert B; Ferguson Miller Shelagh; Knolla Wolfgang; Naumann Renate L C^*

来源：Metallomics, 2011, 3(6): 619-627.

DOI：10.1039/c0mt00083c

Potentiometric titrations of the cytochrome c oxidase (CcO) immobilized in a biomimetic membrane system were followed by two-dimensional surface-enhanced IR absorption spectroscopy (2D SEIRAS) in the ATR-mode. Direct electron transfer was employed to vary the redox state of the enzyme. The CcO was shown to undergo a conformational transition from a non-activated to an activated state after it was allowed to turnover in the presence of oxygen. Differences between the non-activated and activated state were revealed by 2D SEIRA spectra recorded as a function of potential. The activated state was characterized by a higher number of correlated transitions as well as a higher number of amino acids associated with electron transfer.

• 出版日期2011