Electrogenic steps during electron transfer via the cytochrome bc 1 complex of Rhodobacter sphaeroides chromatophores

FEBS Letters

Semenov, Alexey Yu.¹ 

[1] A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119899, Russian Federation

关键词: Bacterial photosynthesis;    bc 1 complex;    Electrogenic reaction;    Rhodobacter sphaeroides;    RC;    reaction center complex;    ΔΨ;    electric potential difference;    QC and QZ;    the quinone-reducing and quinol-oxidizing sites;    respectively;    b 1 and b h;    the low- and the high-potential cytochrome b hemes;    respectively;    P+QA −;    primary dipole in bacterial RC;    QB;    the secondary quinone acceptor in RC;   

DOI  :  10.1016/0014-5793(93)80608-W

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The results of the flash-induced electrometrical investigation on the functioning of the photosynthetic bacterial cytochrome bc ₁ complex are discussed. The data suggest possible arrangement of redox centers in the bc ₁ complex and propose that the total electrogenesis within the bc ₁ complex includes: (i) electron transfer between the low- and the high-potential cytochrome b hemes, (ii) proton binding by doubly reduced Q²⁻ at ubiquinone-reducing center ‘C’, and (iii) proton release on oxidation of QH₂ at ubiquinol-oxidizing center ‘Z’.

【 授权许可】

Unknown