A comparison between the multiline EPR signals of spinach and Anacystis nidulans and their temperature dependence

FEBS Letters

Vänngård, Tore¹  Andréasson, Lars-Erik¹  Lagenfelt, Göran¹  Aasa, Roland¹ 

[1] Department of Biochemistry and Biophysics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden

关键词: Oxygen evolution;    EPR;    Manganese;    Temperature dependence;    (Anacystis nidulans);   

DOI  :  10.1016/0014-5793(87)80934-1

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The multiline EPR signals arising from manganese in the S₂ state of the oxygen-evolving system of spinach and the cyanobacterium Anacystis nidulans have very similar properties and are affected identically by NH₃, suggesting that the system is highly conserved. The temperature dependence of the signal amplitude follows Curie behavior down to sub-helium temperatures. This is in contrast to previous reports, which were taken as evidence for a tetrameric manganese cluster. Thus, it seems that it is not yet possible from EPR data alone to distinguish between this model and a dimeric structure.

【 授权许可】

Unknown