高渗胁迫对莱茵衣藻中质体蓝素向P(700)(+)电子传递的抑制作用。
Inhibition of plastocyanin to P(700)(+) electron transfer in Chlamydomonas reinhardtii by hyperosmotic stress.
作者信息
Cruz J A, Salbilla B A, Kanazawa A, Kramer D M
机构信息
Institute of Biological Chemistry, Department of Biochemistry and Biophysics, 289 Clark Hall, Washington State University, Pullman, WA 99164-6340, USA.
出版信息
Plant Physiol. 2001 Nov;127(3):1167-79.
Abstract
Oxygen electrode and fluorescence studies demonstrate that linear electron transport in the freshwater alga Chlamydomonas reinhardtii can be completely abolished by abrupt hyperosmotic shock. We show that the most likely primary site of inhibition of electron transfer by hyperosmotic shock is a blockage of electron transfer between plastocyanin (PC) or cytochrome c(6) and P(700). The effects on this reaction were reversible upon dilution of the osmolytes and the stability of plastocyanin or photosystem (PS) I was unaffected. Electron micrographs of osmotically shocked cells showed a significant decrease in the thylakoid lumen volume. Comparison of estimated lumenal width with the x-ray structures of plastocyanin and PS I suggest that lumenal space contracts during HOS so as to hinder the movement of docking to PS I of plastocyanin or cytochrome c(6).
摘要
氧电极和荧光研究表明，淡水绿藻莱茵衣藻中的线性电子传递可因突然的高渗休克而完全被阻断。我们发现，高渗休克抑制电子传递最可能的主要位点是质体蓝素（PC）或细胞色素c6与P700之间的电子传递受阻。渗透压剂稀释后，对该反应的影响是可逆的，质体蓝素或光系统（PS）I的稳定性不受影响。高渗休克细胞的电子显微镜照片显示类囊体腔体积显著减小。将估计的腔宽度与质体蓝素和PS I的X射线结构进行比较表明，在高渗休克期间腔空间收缩，从而阻碍质体蓝素或细胞色素c6对接至PS I的移动。
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