The pigment-protein network of a diatom photosystem II-light-harvesting antenna supercomplex
The pigment-protein network of a diatom photosystem II-light-harvesting antenna supercomplex
复制标题
硅藻光系统II-光捕获天线超级复合体的色素-蛋白质网络
DOI：
10.1126/science.aax4406
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发表时间：
2019-08-02
期刊：
影响因子：
56.9
通讯作者：
Shen, Jian-Ren
中科院分区：
文献类型：
--
作者：
Pi, Xiong;Zhao, Songhao;Shen, Jian-Ren
硅藻在全球初级生产力和碳的地球化学循环中发挥着重要作用，部分原因是它们的光合机构能够适应快速变化的光照强度。我们报告的冷冻电子显微镜结构的光系统II（PSII）-岩藻黄素（Fx）叶绿素（Chl）a/c结合蛋白（FCPII）超复合物从中心硅藻角毛藻纤细。该超复合物包括两个原聚体，每个原聚体具有围绕PSII核心的两个四聚体和三个单体FCPII，PSII核心在内腔表面含有五个外源性氧释放蛋白。该结构揭示了一个巨大的色素网络的安排，有助于有效的光能收集，转移和耗散过程中的硅藻。
Diatoms play important roles in global primary productivity and biogeochemical cycling of carbon, in part owing to the ability of their photosynthetic apparatus to adapt to rapidly changing light intensity. We report a cryo-electron microscopy structure of the photosystem II ( PSII)-fucoxanthin ( Fx) chlorophyll ( Chl) a/c binding protein ( FCPII) supercomplex from the centric diatom Chaetoceros gracilis. The supercomplex comprises two protomers, each with two tetrameric and three monomeric FCPIIs around a PSII core that contains five extrinsic oxygen-evolving proteins at the lumenal surface. The structure reveals the arrangement of a huge pigment network that contributes to efficient light energy harvesting, transfer, and dissipation processes in the diatoms.