Physiological and evolutionary implications of tetrameric photosystem I in cyanobacteria.,Nature Plants

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Physiological and evolutionary implications of tetrameric photosystem I in cyanobacteria.
Nature Plants ( IF 15.8 ) Pub Date : 2019-12-09 , DOI: 10.1038/s41477-019-0566-x
Meng Li _{1,

2,

3} , Alexandra Calteau ₄ , Dmitry A Semchonok ₅ , Thomas A Witt ₁ , Jonathan T Nguyen ₁ , Nathalie Sassoon ₆ , Egbert J Boekema ₅ , Julian Whitelegge ₇ , Muriel Gugger ₆ , Barry D Bruce _{1,

2,

8}

Affiliation

Photosystem I (PSI) is present as trimeric complexes in most characterized cyanobacteria and as monomers in plants and algae. Recent reports of tetrameric PSI have raised questions regarding its structural basis, physiological role, phylogenetic distribution and evolutionary significance. Here, we examined PSI in 61 cyanobacteria, showing that tetrameric PSI, which correlates with the psaL gene and a distinct genomic structure, is widespread among heterocyst-forming cyanobacteria and their close relatives. Physiological studies revealed that expression of tetrameric PSI is favoured under high light, with an increased content of novel PSI-bound carotenoids (myxoxanthophyll, canthaxanthan and echinenone). In sum, this work suggests that tetrameric PSI is an adaptation to high light intensity, and that change in PsaL leads to monomerization of trimeric PSI, supporting the hypothesis of tetrameric PSI being the evolutionary intermediate in the transition from cyanobacterial trimeric PSI to monomeric PSI in plants and algae.

中文翻译：

蓝藻中四聚体光系统 I 的生理和进化意义。

光系统 I (PSI) 在大多数特征性蓝藻中以三聚体复合物的形式存在，在植物和藻类中以单体形式存在。最近关于四聚体 PSI 的报道对其结构基础、生理作用、系统发育分布和进化意义提出了质疑。在这里，我们检查了 61 种蓝细菌中的 PSI，表明与 psaL 基因和独特的基因组结构相关的四聚体 PSI 在形成异囊的蓝细菌及其近亲中广泛存在。生理研究表明，四聚体 PSI 的表达在高光下受到青睐，新型 PSI 结合的类胡萝卜素（粘黄素、角黄原和海胆酮）含量增加。总之，这项工作表明四聚体 PSI 是对高光强度的适应，

更新日期：2019-12-11

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