Selective photochemical reduction of either of the two bacteriopheophytins in reaction centers of Rps. sphaeroides R‐26

FEBS Letters

Tiede, David M.¹  Lutz, Marc¹  Robert, Bruno¹ 

[1] Service de Biophysique, Centre d'Etudes Nucleaire de Saclay, 91191 Gif-sur-Yvette Cedex, France

关键词: Reaction center;    Photosynthesis;    Bacteriopheophytin;    Bacteriochlorophyll;    Rps. sphaeroides;    Electron acceptor;   

DOI  :  10.1016/0014-5793(85)80803-6

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The bacterial photosynthetic reaction center (RC) contains two bacteriopheophytin (BPh) molecules, only one of which (characterized by Q_x,y maxima at 540 and 760 nm) has been found to function in the normal photochemistry. We present here the formation of a new RC redox state, in which the apparently inactive BPh (Q_x,y maxima at 530 and 752 nm) is selectively trapped in a reduced state by secondary photochemistry. This BPh is found to be associated to a bacteriochlorophyll (BChI), forming a BChl-BPh complex analogous to the photochemically active BChl-BPh acceptor complex. Electron transfer between the two BPhs is found not to occur.

【 授权许可】

Unknown