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Antenna ring around trimeric Photosystem I in chlorophyll b containing cyanobacterium Prochlorothrix hollandica

机译:含有蓝细菌Prochlorothrix hollandica的叶绿素b中三聚体光系统I的天线环

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Prochlorothrix hollandica is one of the three known species of an unusual clade of cyanobacteria (formerly called "prochlorophytes") that contain chlorophyll a and b molecules bound to intrinsic light-harvesting antenna proteins. Here, we report the structural characterization of supramolecular complex consisting of Photosystem I (PSI) associated with the chlorophyll a/b-binding Pcb proteins. Electron rnicroscopy and single particle image analysis of negatively stained preparations revealed that the Pcb-PSI supercomplex consists of a central trimeric PSI surrounded by a ring of 18 Pcb subunits. We conclude that the formation of the Pcb ring around trimeric PSI represents a mechanism for increasing the light-harvesting efficiency in chlorophyll b-containing cyanobacteria. (c) 2005 Elsevier B.V All rights reserved.
机译:荷兰原绿藻是已知的不寻常的蓝藻进化枝(以前称为“原绿藻”)的三个物种之一,其中含有与固有的光收集天线蛋白结合的叶绿素a和b分子。在这里,我们报告由光系统I(PSI)与叶绿素a / b结合Pcb蛋白相关的超分子复合物的结构表征。负染色制剂的电子镜和单颗粒图像分析表明,Pcb-PSI超复合物由被18个Pcb亚基环包围的中央三聚体PSI组成。我们得出结论,三聚体PSI周围的Pcb环的形成代表增加含叶绿素b的蓝细菌的光收集效率的机制。 (c)2005 Elsevier B.V保留所有权利。

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