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The structure of a triple complex of plant photosystem I with ferredoxin and plastocyanin
Nature Plants ( IF 18.0 ) Pub Date : 2020-10-05 , DOI: 10.1038/s41477-020-00779-9
Ido Caspy 1 , Anna Borovikova-Sheinker 1 , Daniel Klaiman 1 , Yoel Shkolnisky 2 , Nathan Nelson 1
Affiliation  

The ability of photosynthetic organisms to use sunlight as a sole source of energy is endowed by two large membrane complexes—photosystem I (PSI) and photosystem II (PSII). PSI and PSII are the fundamental components of oxygenic photosynthesis, providing oxygen, food and an energy source for most living organisms on Earth. Currently, high-resolution crystal structures of these complexes from various organisms are available. The crystal structures of megadalton complexes have revealed excitation transfer and electron-transport pathways within the various complexes. PSI is defined as plastocyanin–ferredoxin oxidoreductase but a high-resolution structure of the entire triple supercomplex is not available. Here, using a new cryo-electron microscopy technique, we solve the structure of native plant PSI in complex with its electron donor plastocyanin and the electron acceptor ferredoxin. We reveal all of the contact sites and the modes of interaction between the interacting electron carriers and PSI.



中文翻译:

植物光系统Ⅰ与铁氧还蛋白和质体蓝素三重复合物的结构

光合生物利用阳光作为唯一能源的能力是由两个大型膜复合物——光系统 I (PSI) 和光系统 II (PSII) 赋予的。PSI 和 PSII 是有氧光合作用的基本组成部分,为地球上大多数生物提供氧气、食物和能源。目前,可以获得来自各种生物的这些复合物的高分辨率晶体结构。兆道尔顿配合物的晶体结构揭示了各种配合物中的激发转移和电子传输途径。PSI 被定义为质体蓝素-铁氧还蛋白氧化还原酶,但整个三重超复合物的高分辨率结构不可用。在这里,使用一种新的低温电子显微镜技术,我们解决了天然植物 PSI 与其电子供体质体蓝素和电子受体铁氧还蛋白复合的结构。我们揭示了相互作用的电子载体和 PSI 之间的所有接触位点和相互作用模式。

更新日期:2020-10-05
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