Is phylloquinone an obligate electron carrier in photosystem I?

FEBS Letters

Franke, James E.¹  Palace, Gerard P.¹  Warden, Joseph T.¹ 

[1] Department of Chemistry, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA

关键词: Electron carrier A1;    P-700;    Photosystem I;    Phylloquinone;    Signal 1;    (Spinach subchloroplast particle);   

DOI  :  10.1016/0014-5793(87)80113-8

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Comparative quantitative analysis of phylloquinone content and photochemically competent P-700 has been performed on photosystem I particles subjected to photolysis with ultraviolet irradiation. Nonirradiated control particles exhibit a phylloquinone/P-700 stoichiometry of 1.9 ± 0.2. Photolysis of the photosystem I particles induces a progressive depletion of phylloquinone, however, photochemistry as assayed at room temperature by the photooxidation of P-700 is unaffected. These data are not consistent with the assignment of phylloquinone as a functional intermediate at room temperature between P-700 and the iron-sulfur clusters, center A and center B.

【 授权许可】

Unknown