Effect of Zn2+ on photosynthetic oxygen evolution and chloroplast manganese

FEBS Letters

Cox, Raymond P.¹  Miller, Mette¹ 

[1] Institute of Biochemistry, Odense University, Campusvej 55, 5230 Odense M, Denmark

关键词: Chloroplast;    Thylakoid;    Manganese;    EPR;    Oxygen evolution;    Zinc treatment;   

DOI  :  10.1016/0014-5793(82)80631-5

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Treatment of thylakoid suspensions with Zn²⁺ causes the appearance of an EPR signal due to Mn²⁺. The size of the signal was linearly correlated with the inhibition of oxygen evolution. Full inhibition appeared to correspond to the release of 2 Mn atoms/reaction centre of photosystem II. The released Mn²⁺ remained associated with the chloroplast pellet on centrifugation and took several hours to equilibrate with the surrounding medium. The sequestered Mn²⁺ does not appear to be in the thylakoid interior but in a more restricted hydrophilic compartment.

【 授权许可】

Unknown