Reconstructing the origin of oxygenic photosynthesis: do assembly and photoactivation recapitulate evolution?
File(s)
Accepted version
Author(s)
Cardona Londono, T
Type
Journal Article
Abstract
Due to the great abundance of genomes and protein structures that today span a broad diversity of organisms, now more than ever before, it is possible to reconstruct the molecular evolution of protein complexes at an incredible level of detail. Here, I recount the story of oxygenic photosynthesis or how an ancestral reaction center was transformed into a sophisticated photochemical machine capable of water oxidation. First, I review the evolution of all reaction center proteins in order to highlight that Photosystem II and Photosystem I, today only found in the phylum Cyanobacteria, branched out very early in the history of photosynthesis. Therefore, it is very unlikely that they were acquired via horizontal gene transfer from any of the described phyla of anoxygenic phototrophic bacteria. Second, I present a new evolutionary scenario for the origin of the CP43 and CP47 antenna of Photosystem II. I suggest that the antenna proteins originated from the remodeling of an entire Type I reaction center protein and not from the partial gene duplication of a Type I reaction center gene. Third, I highlight how Photosystem II and Photosystem I reaction center proteins interact with small peripheral subunits in remarkably similar patterns and hypothesize that some of this complexity may be traced back to the most ancestral reaction center. Fourth, I outline the sequence of events that led to the origin of the Mn4CaO5 cluster and show that the most ancestral Type II reaction center had some of the basic structural components that would become essential in the coordination of the water-oxidizing complex. Finally, I collect all these ideas, starting at the origin of the first reaction center proteins and ending with the emergence of the water-oxidizing cluster, to hypothesize that the complex and well-organized process of assembly and photoactivation of Photosystem II recapitulate evolutionary transitions in the path to oxygenic photosynthesis.
Date Issued
2016-02-16
Date Acceptance
2016-02-16
Citation
Frontiers in Plant Science, 2016, 7
ISSN
1664-462X
Publisher
Frontiers
Journal / Book Title
Frontiers in Plant Science
Volume
7
Copyright Statement
© 2016 Cardona. This is an open-access article distributed under the terms of the Creative Commons
Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted,
provided the original author(s) or licensor are credited and that the original publication in this
journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction
is permitted which does not comply with these terms.
Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted,
provided the original author(s) or licensor are credited and that the original publication in this
journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction
is permitted which does not comply with these terms.
License URL
Publication Status
Published
Article Number
257