Plastoquinone as a mobile redox carrier in the photosynthetic membrane

FEBS Letters

Millner, P.A.¹  Barber, J.¹ 

[1] ARC Photosynthesis Research Group, Department of Pure and Applied Biology, Imperial College, London SW7 2BB, England

关键词: Plastoquinone;    Fluidity;    Lateral diffusion;    Thylakoid membrane;    Photosynthesis;   

DOI  :  10.1016/0014-5793(84)80277-X

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The role of plastoquinone as a mobile redox carrier linking photosystem II and the cytochrome b ₆−f complex is considered. It is proposed that plastoquinone is located primarily within the fluid bilayer-midplane region of the thylakoid membrane and thus can move laterally at very fast rates corresponding to a microscopic diffusion coefficient of 10⁻⁶ cm²·s⁻¹. Because of the presence of integral proteins the diffusion path will be tortuous and extended, giving rise to a sub-macroscopic diffusion coefficient which is lower than the above value. Even so it is concluded that within the half-time for electron donation to the cytochrome b ₆−f complex there is adequate time for plastoquinone to diffuse over a distance equivalent to the radius of a granum membrane.

【 授权许可】

Unknown