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蓝藻核心天线蛋白进化的系统发育和光谱学见解

Phylogenetic and spectroscopic insights on the evolution of core antenna proteins in cyanobacteria.

作者信息

Biswas Sandeep, Niedzwiedzki Dariusz M, Liberton Michelle, Pakrasi Himadri B

机构信息

Department of Biology, Washington University, St. Louis, MO, 63130, USA.

Center for Solar Energy and Energy Storage, Washington University, St. Louis, MO, 63130, USA.

出版信息

Photosynth Res. 2024 Dec;162(2-3):197-210. doi: 10.1007/s11120-023-01046-6. Epub 2023 Sep 22.

Abstract

Light harvesting by antenna systems is the initial step in a series of electron-transfer reactions in all photosynthetic organisms, leading to energy trapping by reaction center proteins. Cyanobacteria are an ecologically diverse group and are the simplest organisms capable of oxygenic photosynthesis. The primary light-harvesting antenna in cyanobacteria is the large membrane extrinsic pigment-protein complex called the phycobilisome. In addition, cyanobacteria have also evolved specialized membrane-intrinsic chlorophyll-binding antenna proteins that transfer excitation energy to the reaction centers of photosystems I and II (PSI and PSII) and dissipate excess energy through nonphotochemical quenching. Primary among these are the CP43 and CP47 proteins of PSII, but in addition, some cyanobacteria also use IsiA and the prochlorophyte chlorophyll a/b binding (Pcb) family of proteins. Together, these proteins comprise the CP43 family of proteins owing to their sequence similarity with CP43. In this article, we have revisited the evolution of these chlorophyll-binding antenna proteins by examining their protein sequences in parallel with their spectral properties. Our phylogenetic and spectroscopic analyses support the idea of a common ancestor for CP43, IsiA, and Pcb proteins, and suggest that PcbC might be a distant ancestor of IsiA. The similar spectral properties of CP47 and IsiA suggest a closer evolutionary relationship between these proteins compared to CP43.

摘要

天线系统进行的光捕获是所有光合生物一系列电子转移反应的初始步骤,最终导致反应中心蛋白捕获能量。蓝细菌是一个生态多样的群体,是能够进行产氧光合作用的最简单生物。蓝细菌中的主要光捕获天线是一种名为藻胆体的大型膜外在色素蛋白复合物。此外,蓝细菌还进化出了专门的膜内在叶绿素结合天线蛋白,这些蛋白将激发能转移到光系统I和II(PSI和PSII)的反应中心,并通过非光化学猝灭耗散多余能量。其中主要的是PSII的CP43和CP47蛋白,但此外,一些蓝细菌还使用IsiA和原绿藻叶绿素a/b结合(Pcb)蛋白家族。由于它们与CP43的序列相似性,这些蛋白共同构成了CP43蛋白家族。在本文中,我们通过平行研究它们的蛋白质序列及其光谱特性,重新审视了这些叶绿素结合天线蛋白的进化。我们的系统发育和光谱分析支持CP43、IsiA和Pcb蛋白有共同祖先的观点,并表明PcbC可能是IsiA的远祖。与CP43相比,CP47和IsiA相似的光谱特性表明这些蛋白之间存在更密切的进化关系。

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