气候变化领域集成服务门户(CCPortal): Early Archean origin of Photosystem II

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DOI	10.1111/gbi.12322
	Early Archean origin of Photosystem II
	Cardona T.; Sánchez-Baracaldo P.; Rutherford A.W.; Larkum A.W.
发表日期	2019
ISSN	14724677
起始页码	127
结束页码	150
卷号	17 期号:2
英文摘要	Photosystem II is a photochemical reaction center that catalyzes the light-driven oxidation of water to molecular oxygen. Water oxidation is the distinctive photochemical reaction that permitted the evolution of oxygenic photosynthesis and the eventual rise of eukaryotes. At what point during the history of life an ancestral photosystem evolved the capacity to oxidize water still remains unknown. Here, we study the evolution of the core reaction center proteins of Photosystem II using sequence and structural comparisons in combination with Bayesian relaxed molecular clocks. Our results indicate that a homodimeric photosystem with sufficient oxidizing power to split water had already appeared in the early Archean about a billion years before the most recent common ancestor of all described Cyanobacteria capable of oxygenic photosynthesis, and well before the diversification of some of the known groups of anoxygenic photosynthetic bacteria. Based on a structural and functional rationale, we hypothesize that this early Archean photosystem was capable of water oxidation to oxygen and had already evolved protection mechanisms against the formation of reactive oxygen species. This would place primordial forms of oxygenic photosynthesis at a very early stage in the evolutionary history of life. © 2018 The Authors. Geobiology Published by John Wiley & Sons Ltd.
关键词	Archean bacterium common ancestry evolution oxidation oxygen photochemistry photosynthesis reactive oxygen species Chloroflexi Chloroflexi (class)Cyanobacteria Eukaryota Photobacteria Proteobacteria bacterial protein analysis Bayes theorem cyanobacterium genetics molecular evolution photosynthesis photosystem II phylogeny physiology Bacterial Proteins Bayes Theorem Cyanobacteria Evolution, Molecular Photosynthesis Photosystem II Protein Complex Phylogeny
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133240
推荐引用方式 GB/T 7714	Cardona T.,Sánchez-Baracaldo P.,Rutherford A.W.,et al. Early Archean origin of Photosystem II[J]. Geobiology,2019,17(2).
APA	Cardona T.,Sánchez-Baracaldo P.,Rutherford A.W.,&Larkum A.W..(2019).Early Archean origin of Photosystem II.,17(2).
MLA	Cardona T.,et al."Early Archean origin of Photosystem II".17.2(2019).