Direct and indirect electron transfer from cytochromes c and c 2 to the photosynthetic reaction center in pigment‐protein complexes isolated from Rhodocyclus gelatinosus

FEBS Letters

Fukushima, Atsushi¹  Matsuura, Katsumi¹  Shimada, Keizo¹  Satoh, Toshio¹ 

[1]Department of Biology, Faculty of Science, Tokyo Metropolitan University, Fukazawa 2-1-1, Setagaya, Tokyo 158, Japan

关键词: Bacterial photosynthesis;    Reaction center;    Cytochrome c;    Electron transport;    Bacteriochlorophyll;    (Rhodocyclus gelatinosus);   

DOI  :  10.1016/0014-5793(88)80163-7

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Electron transfer from soluble cytochromes c and c ₂ to the photo-oxidized bacteriochlorophyll dimer was studied in photosynthetic reaction center (RC) complexes and RC-B870 complexes isolated from Rhodocyclus gelatinosus. In the RC-B870 complex which consists of 6 polypeptides including a bound cytochrome subunit, cytochrome c from horse heart or cytochrome c ₂, from R. gelatinosus was oxidized by photo-oxidized bacteriochlorophyll dimer indirectly via cytochrome c-555 in the complex. In the RC complex which is composed of two polypeptides, the oxidized bacteriochlorophyll dimer was reduced directly by the soluble cytochromes. Although direct electron transfer from soluble cytochrome does not function in R. gelatinosus in vivo, it would replace indirect electron donation if the bound cytochrome were lost mutationally.

【 授权许可】

Unknown