A near infrared electronic transition associated with conversion between S‐states of the photosynthetic O2‐evolving complex

FEBS Letters

Dismukes, G.Charles¹  Mathis, Paul¹ 

[1] Service de Biophysique, Department de Biologie, CEN-Saclay, BP 2, 91191 Gif-sur-Yvette, France

关键词: Photosynthetic oxygen evolution;    Water oxidation;    Electronic spectroscopy;    Manganese;    ΔA;    absorption change;    DCMU;    3-(3;    4-dichlorophenyl)-1;    1-dimethylurea;    DMBQ;    2;    3-dimethylbenzoquinone;    Mes;    2-(N-morpholino)ethanesulfonic acid;    PPBQ;    phenyl-p-benzoquinone;    PS-II;    Photosystem H;    P700;    photooxidizable chlorophyll of reaction center PS-I;    P680;    photooxidizable chlorophyll of reaction center PS-II;   

DOI  :  10.1016/0014-5793(84)81238-7

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

A new electronic transition is observable in O₂-evolving photosynthetic membranes of spinach enriched in Photosystem II. The transition occurs predominantly in the oxidation state created after a single flash of light (S₂ state). It oscillates in yield with a period of flashes when exposed to a train of short light flashes. Conditions which abolish O₂ evolution and remove functional manganese destroy this effect. The spectrum and absorptivity of the oscillating component are similar to those found in synthetic manganese dimers poised in the mixed-valent oxidation state Mn₂(III,IV). A similar structural unit is thus implicated for the manganese site involved in O₂ evolution.

【 授权许可】

Unknown