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神奇的藻胆体。

The amazing phycobilisome.

机构信息

Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.

出版信息

Biochim Biophys Acta Bioenerg. 2020 Apr 1;1861(4):148047. doi: 10.1016/j.bbabio.2019.07.002. Epub 2019 Jul 12.

Abstract

Cyanobacteria and red-algae share a common light-harvesting complex which is different than all other complexes that serve as photosynthetic antennas - the Phycobilisome (PBS). The PBS is found attached to the stromal side of thylakoid membranes, filling up most of the gap between individual thylakoids. The PBS self assembles from similar homologous protein units that are soluble and contain conserved cysteine residues that covalently bind the light absorbing chromophores, linear tetra-pyrroles. Using similar construction principles, the PBS can be as large as 16.8 MDa (68×45×39nm), as small as 1.2 MDa (24 × 11.5 × 11.5 nm), and in some unique cases smaller still. The PBS can absorb light between 450 nm to 650 nm and in some cases beyond 700 nm, depending on the species, its composition and assembly. In this review, we will present new observations and structures that expand our understanding of the distinctive properties that make the PBS an amazing light harvesting system. At the end we will suggest why the PBS, for all of its excellent properties, was discarded by photosynthetic organisms that arose later in evolution such as green algae and higher plants.

摘要

蓝藻和红藻共享一个共同的光捕获复合物,与作为光合天线的所有其他复合物不同 - 藻胆体(PBS)。PBS 附着在类囊体膜的基质侧,填充了各个类囊体之间的大部分间隙。PBS 自组装由相似的同源蛋白单元组成,这些蛋白单元是可溶性的,并且含有保守的半胱氨酸残基,这些残基共价结合吸光发色团,线性四吡咯。使用类似的构建原理,PBS 的大小可以达到 16.8 MDa(68×45×39nm),小至 1.2 MDa(24×11.5×11.5nm),在某些特殊情况下甚至更小。PBS 可以在 450nm 到 650nm 之间吸收光,在某些情况下甚至超过 700nm,这取决于物种、其组成和组装。在这篇综述中,我们将介绍新的观察结果和结构,这些结果扩展了我们对使 PBS 成为惊人的光捕获系统的独特特性的理解。最后,我们将提出为什么 PBS 尽管具有所有优异的特性,但被后来进化的光合生物如绿藻和高等植物所抛弃。

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