Electron transfer from A− 1 to an iron‐sulfur center with t = 200 ns at room temperature in photosystem I Characterization by flash absorption spectroscopy

FEBS Letters

Brettel, K.¹ 

[1] Max-Volmer-Institut für Biophysikalische und Physikalische Chemie, Technische Universität Berlin, Straβe des 17. Juni 135, D-1000 Berlin 12, Germany

关键词: Photosystem I;    Electron transfer;    Vitamin K1;    Absorption difference spectrum;    Photosynthesis;    (Synechococcus sp.);    Chl;    chlorophyll;    d;    optical path for the measuring light;    DPIP;    2;    6-dichlorophenolindophenol;    (FeS);    ironsulfur center;    FWHM;    full width at half maximum;    PS;    photosystem;    vit.K1;    vitamin K1;   

DOI  :  10.1016/0014-5793(88)80552-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Forward electron transfer in intact photosystem I particles from Synechococcus sp. at room temperature has been studied by flash absorption spectroscopy with a time resolution of 5 ns. A kinetic phase with t = 200 ns was resolved and characterized by its absorption difference spectrum between 325 and 495 nm. This phase is attributed to electron transfer from the reduced redox center A₁ to an iron-sulfur center, probably F_x. The difference spectrum for the reduction of A₁ is evaluated and the previously proposed identification of A₁ with vitamin K₁ is discussed.

【 授权许可】

Unknown