Evolution of photosystem I - from symmetry through pseudosymmetry to asymmetry
Evolution of photosystem I - from symmetry through pseudosymmetry to asymmetry
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DOI：
10.1016/s0014-5793(04)00360-6
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发表时间：
2004-04-30
期刊：
影响因子：
3.5
通讯作者：
Nelson, N
中科院分区：
文献类型：
--
作者：
Ben-Shem, A;Frolow, F;Nelson, N
光系统(PS)I的进化可能是由一个类似于目前绿色细菌中存在的同源二聚体反应中心的形成而开始的。基因复制产生了异二聚体反应中心，随后进化成蓝藻、藻类和植物叶绿体中存在的PSI。在PSI的进化过程中，在各种生物体中进行了几次最大化采光效率的尝试。在绿双科植物中，在均二聚体反应中心增加了绿小体和FMO。在蓝藻中，藻胆体和CP43‘进化为适应光照限制和胁迫条件。植物PSI利用膜捕光蛋白(LHCI)的模块化排列。我们从进化光谱的两端获得了结构信息。本文报道了毛状氯杆菌FMO结构的新特征。我们对植物PSI的结构表明，G亚基的添加为LHCI结合提供了模板，H亚基的添加阻止了三聚体形成的可能性，并为LHCII提供了结合部位和从PSII到PSI的能量溢出的开始。(C)2004年，由Elsevier B.V.代表欧洲生化学会联合会出版。
The evolution of photosystem (PS) I was probably initiated by the formation of a homodimeric reaction center similar to the one currently present in green bacteria. Gene duplication has generated a heterodimeric reaction center that subsequently evolved to the PSI present in cyanobacteria, algae and plant chloroplasts. During the evolution of PSI several attempts to maximize the efficiency of light harvesting took place in the various organisms. In the Chlorobiaceae, chlorosomes and FMO were added to the homodimeric reaction center. In cyanobacteria phycobilisomes and CP43' evolved to cope with the light limitations and stress conditions. The plant PSI utilizes a modular arrangement of membrane light-harvesting proteins (LHCI). We obtained structural information from the two ends of the evolutionary spectrum. Novel features in the structure of Chlorobium tepidum FMO are reported in this communication. Our structure of plant PSI reveals that the addition of subunit G provided the template for LHCI binding, and the addition of subunit H prevented the possibility of trimer formation and provided a binding site for LHCII and the onset of energy spillover from PSII to PSI. (C) 2004 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies.