The structure of FCPb, a light-harvesting complex in the diatom Cyclotella meneghiniana

The structure of FCPb, a light-harvesting complex in the diatom Cyclotella meneghiniana
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FCPb(硅藻小环藻中的光捕获复合物)的结构

DOI:
10.1007/s11120-016-0328-9
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发表时间:
2018
影响因子:
3.7
通讯作者:
Büchel C
Büchel C
中科院分区:
生物学3区
文献类型:
--
作者:
Röding A;Boekema E;Büchel C

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硅藻拥有岩藻黄质叶绿素蛋白(FCP)作为光捕获系统。这些膜内在蛋白结合岩藻黄质作为主要类胡萝卜素,结合叶绿素作为辅助叶绿素。与高等植物光捕获复合物 II 相对较高的序列同源性引起了相似整体结构的假设。然而,从像小环藻这样的中心硅藻中,可以分离出两种主要的 FCP 复合物。 FCPa由Fcp2和Fcp6亚基组成,被证明是三聚体,而已知含有Fcp5多肽的FCPb是较高寡聚状态。到目前为止,还没有任何一种复合物的分子结构可用。在这里,我们使用电子显微镜和单粒子分析来阐明 FCPb 的整体架构。该复合物由三聚体作为基本单元构建,组装成非聚体部分。三聚体本身更小,即比 LHCII 更紧凑,但主要结构特征得以保留。
Diatoms possess fucoxanthin chlorophyll proteins (FCP) as light-harvesting systems. These membrane intrinsic proteins bind fucoxanthin as major carotenoid and Chl c as accessory chlorophyll. The relatively high sequence homology to higher plant light-harvesting complex II gave rise to the assumption of a similar overall structure. From centric diatoms likeCyclotella meneghiniana, however, two major FCP complexes can be isolated. FCPa, composed of Fcp2 and Fcp6 subunits, was demonstrated to be trimeric, whereas FCPb, known to contain Fcp5 polypeptides, is of higher oligomeric state. No molecular structure of either complex is available so far. Here we used electron microscopy and single particle analysis to elucidate the overall architecture of FCPb. The complexes are built from trimers as basic unit, assembling into nonameric moieties. The trimer itself is smaller, i.e. more compact than LHCII, but the main structural features are conserved.
从褐藻(Petalonia fascia)中分离出岩藻黄质-叶绿素-蛋白质复合物的超分子组装。
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