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Probing the secondary quinone (QB) environment in photosynthetic bacterial reaction centers by light-induced FTIR difference spectroscopy.

作者信息

Breton J, Berthomieu C, Thibodeau D L, Nabedryk E

机构信息

DBCM/SBE, C.E.N. Saclay, Gif-sur-Yvette, France.

出版信息

FEBS Lett. 1991 Aug 19;288(1-2):109-13. doi: 10.1016/0014-5793(91)81014-y.

DOI:10.1016/0014-5793(91)81014-y
PMID:1879543
Abstract

The photoreduction of the secondary electron acceptor, QB, has been characterized by light-induced Fourier transform infrared difference spectroscopy of Rb. sphaeroides and Rp. viridis reaction centers. The reaction centers were supplemented with ubiquinone (UQ10 or UQ0). The QB- state was generated either by continuous illumination at very low intensity or by single flash in the presence of redox compounds which rapidly reduce the photooxidized primary electron donor P+. This approach yields spectra free from P and P+ contributions making possible the study of the microenvironment of QB and QB-. Assignments are proposed for the C...O vibration of QB- and tentatively for the C = O and C = C vibrations of QB.

摘要

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Investigation of ubiquinol formation in isolated photosynthetic reaction centers by rapid-scan Fourier transform IR spectroscopy.
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