Evolutionary loss of light-harvesting proteins Lhcb6 and Lhcb3 in major land plant groups--break-up of current dogma
Language English Country Great Britain, England Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
27001142
DOI
10.1111/nph.13947
Knihovny.cz E-resources
- Keywords
- Lhcb proteins, conifers, electron microscopy, evolution, land plants, photosystem II (PSII), supercomplex,
- MeSH
- Biological Evolution * MeSH
- Photosystem II Protein Complex metabolism MeSH
- Phylogeny MeSH
- Protein Subunits chemistry metabolism MeSH
- Genes, Plant MeSH
- Plant Proteins metabolism MeSH
- Sequence Homology, Amino Acid MeSH
- Light-Harvesting Protein Complexes metabolism ultrastructure MeSH
- Embryophyta metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Photosystem II Protein Complex MeSH
- Protein Subunits MeSH
- Plant Proteins MeSH
- Light-Harvesting Protein Complexes MeSH
Photosynthesis in plants and algae relies on the coordinated function of photosystems (PS) I and II. Their efficiency is augmented by finely-tuned light-harvesting proteins (Lhcs) connected to them. The most recent Lhcs (in evolutionary terms), Lhcb6 and Lhcb3, evolved during the transition of plants from water to land and have so far been considered to be an essential characteristic of land plants. We used single particle electron microscopy and sequence analysis to study architecture and composition of PSII supercomplex from Norway spruce and related species. We have found that there are major land plant families that lack functional lhcb6 and lhcb3 genes, which notably changes the organization of PSII supercomplexes. The Lhcb6 and Lhcb3 proteins have been lost in the gymnosperm genera Picea and Pinus (family Pinaceae) and Gnetum (Gnetales). We also revealed that the absence of these proteins in Norway spruce modifies the PSII supercomplex in such a way that it resembles its counterpart in the alga Chlamydomonas reinhardtii, an evolutionarily older organism. Our results break a deep-rooted concept of Lhcb6 and Lhcb3 proteins being the essential characteristic of land plants, and beg the question of what the evolutionary benefit of their loss could be.
References provided by Crossref.org
A kaleidoscope of photosynthetic antenna proteins and their emerging roles
Unique organization of photosystem II supercomplexes and megacomplexes in Norway spruce
