Investigation of models for photosynthetic electron acceptors

FEBS Letters

Nabedryk, E.¹  Bagley, K.³  Bauscher, M.²  Breton, J.¹  Mäntele, W.² 

[1] Service de Biophysique, Département de Biologie, CEN Saclay, 91191 Gif/Yvette Cedex, France;Institut für Biophysik und Strahlenbiologie, Albertstr. 23, 7800 FreiburgFRG;Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA

关键词: Photosynthesis;    Electron transfer;    Reaction center;    Infrared spectroscopy;    Electrochemistry;    Quinone;    Qa;    primary quinone;    QB;    secondary quinone;    Q.−;    semiquinone anion;    Q2−;    quinol dianion;    P+Q−/PQ;    difference between the charge-separated (the electron remains at QA or qb) and the relaxed state;    CPE;    constant potential electrolysis;    CV;    cyclic voltammogram;    Em;    midpoint potential;    RC;    reaction center;    Q;    2;    3-di-methoxy-5-methyl-1;    4-benzoquinone;    DMF;    dimethylformamide;    THF;    tetrahydrofuran;   

DOI  :  10.1016/0014-5793(90)80668-9

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

In order to gain more information about the binding and interaction of quinones acting as electron acceptors in photosynthetic reaction centers, infrared spectra of ‘model” quinones and their reduced species (semiquinones, quinone dianions and quinols) were recorded in a spectroelectrochemical cell. The frequencies and the extinction coefficients of the quinone C = O and C = C stretching vibrations which are shifted upon reduction were obtained in different solvents. These spectra are used to estimate the contribution of quinone reduction to light-induced infrared difference spectra between the charge-separated and the relaxed state of photosynthetic reaction centers.

【 授权许可】

Unknown