Low temperature photochemistry and spectral properties of a photosystem 2 reaction center complex containing the proteins D1 and D2 and two hemes of Cyt b‐559

FEBS Letters

Heber, U.¹  Schreiber, U.¹  Shuvalov, V.A.¹ 

[1] Institute of Botany of the University of Würzburg, D-87 Würzburg, FRG

关键词: Photosystem 2;    Reaction center;    Cytochrome b-559;    Charge separation;   

DOI  :  10.1016/0014-5793(89)81607-2

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

A D1/D2/Cyt b-559 complex isolated from spinach chloroplasts contained 4 chlorophylls, 2 pheophytins and 2 hemes of Cyt b-559 with different redox potentials measured to be +70 mV(LP) (pH 7.2) and about −500 mV (XLP). Prereduced Cyt(LP) is photooxidized at 77 K due to the interaction with the state P680⁺ Ph ⁻ which produces the accumulation of Cyt⁺ P680 Ph⁻. Another Ph molecule is reduced with a midpoint potential of −450 mV and can interact with Cyt (XLP) forming a second electron transfer chain.

【 授权许可】

Unknown