Early Archean origin of Photosystem II

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Title: Early Archean origin of Photosystem II
Author(s): Cardona Londono, T
Sanchez-Baracaldo, P
Rutherford, AW
Larkum, A
Item Type: Journal Article
Abstract: 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.
Publication Date: 9-Nov-2018
Date of Acceptance: 11-Oct-2018
URI: http://hdl.handle.net/10044/1/65212
DOI: https://dx.doi.org/10.1111/gbi.12322
ISSN: 1472-4669
Publisher: Wiley
Journal / Book Title: Geobiology
Sponsor/Funder: Leverhulme Trust
Copyright Statement: © 2018 The Authors. Geobiology Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: Archean
reaction center
water oxidation
0403 Geology
0602 Ecology
0402 Geochemistry
Geochemistry & Geophysics
Publication Status: Published online
Online Publication Date: 2018-11-09
Appears in Collections:Faculty of Natural Sciences

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