On the function of two vitamin K1 molecules in the PS I electron acceptor complex

FEBS Letters

Malkin, Richard¹ 

[1] Division of Molecular Plant Biology, 313 Hilgard Hall, Univerity of California, Berkeley, CA 94720, USA

关键词: Phylloquinone Fe-S center P700 Photosystem I;   

DOI  :  10.1016/0014-5793(86)81046-8

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Various PS I preparations from higher plants and cyanobacteria are found to contain vitamin K₁, or phylloquinone, in a stoichiometry of 2 vitamin K₁/P700. Extractions of lyophilized PS I preparations with organic solvents led to removal of one molecule of vitamin K₁ but conditions have not been established for the removal of the second quinone. The quinone-depleted PS I complex ( ~ 1 vitamin K₁/P700) was fully active in transferring electrons at both physiological and cryogenic temperatures, indicating one vitamin K₁ molecule was not required for these activities.

【 授权许可】

Unknown