Algal MIPs, high diversity and conserved motifs
Autor: | Urban Johanson, Hanna I. Anderberg, Jonas Å. H. Danielson |
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Jazyk: | angličtina |
Rok vydání: | 2011 |
Předmět: |
Subfamily
Evolution ved/biology.organism_classification_rank.species Molecular Sequence Data Chlorophyta Aquaporins Algae Phylogenetics Botany Terrestrial plant QH359-425 Amino Acid Sequence Ecology Evolution Behavior and Systematics Conserved Sequence Phylogeny Plant Proteins biology Phylogenetic tree ved/biology fungi Major intrinsic proteins food and beverages Plants biology.organism_classification Sister group Evolutionary biology Sequence Alignment Genome Plant Research Article |
Zdroj: | BMC Evolutionary Biology BMC Evolutionary Biology, Vol 11, Iss 1, p 110 (2011) |
ISSN: | 1471-2148 |
Popis: | Background Major intrinsic proteins (MIPs) also named aquaporins form channels facilitating the passive transport of water and other small polar molecules across membranes. MIPs are particularly abundant and diverse in terrestrial plants but little is known about their evolutionary history. In an attempt to investigate the origin of the plant MIP subfamilies, genomes of chlorophyte algae, the sister group of charophyte algae and land plants, were searched for MIP encoding genes. Results A total of 22 MIPs were identified in the nine analysed genomes and phylogenetic analyses classified them into seven subfamilies. Two of these, Plasma membrane Intrinsic Proteins (PIPs) and GlpF-like Intrinsic Proteins (GIPs), are also present in land plants and divergence dating support a common origin of these algal and land plant MIPs, predating the evolution of terrestrial plants. The subfamilies unique to algae were named MIPA to MIPE to facilitate the use of a common nomenclature for plant MIPs reflecting phylogenetically stable groups. All of the investigated genomes contained at least one MIP gene but only a few species encoded MIPs belonging to more than one subfamily. Conclusions Our results suggest that at least two of the seven subfamilies found in land plants were present already in an algal ancestor. The total variation of MIPs and the number of different subfamilies in chlorophyte algae is likely to be even higher than that found in land plants. Our analyses indicate that genetic exchanges between several of the algal subfamilies have occurred. The PIP1 and PIP2 groups and the Ca2+ gating appear to be specific to land plants whereas the pH gating is a more ancient characteristic shared by all PIPs. Further studies are needed to discern the function of the algal specific subfamilies MIPA-E and to fully understand the evolutionary relationship of algal and terrestrial plant MIPs. |
Databáze: | OpenAIRE |
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