UV optical difference spectrum associated with the reduction of electron acceptor A1 in photosystem I of higher plants

FEBS Letters

Evans, M.C.W.¹  Mansfield, R.W.¹ 

[1] Department of Botany & Microbiology, University College London, Gower Street, London WC1E 6BT, England

关键词: Photosystem I;    Electron acceptor;    Ultraviolet optical difference spectrum;    Quinone;    Chl;    chlorophyll;    PS;    photosystem;    UV;    ultraviolet;   

DOI  :  10.1016/0014-5793(86)80747-5

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Photosystem I particles containing I P700 per 32 chlorophyll molecules were illuminated at cryogenic temperatures in the presence of sodium dithionite. Under conditions which specifically led to reduction of acceptor a₁ (as shown by its characteristic EPR spectrum) optical absorbance changes were detected between 240 and 325 nm. The appearance of these changes correlated closely with the increase in amplitude of the ai EPR signal. The possibility that a quinone-like species is associated with, or directly involved in intermediary PS I electron flow is discussed.

【 授权许可】

Unknown