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The Origin and Evolution of the Plant Cell Surface: Algal Integrin-Associated Proteins and a New Family of Integrin-Like Cytoskeleton-ECM Linker Proteins.
- Source :
-
Genome biology and evolution [Genome Biol Evol] 2015 May 14; Vol. 7 (6), pp. 1580-9. Date of Electronic Publication: 2015 May 14. - Publication Year :
- 2015
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Abstract
- The extracellular matrix of scaly green flagellates consists of small organic scales consisting of polysaccharides and scale-associated proteins (SAPs). Molecular phylogenies have shown that these organisms represent the ancestral stock of flagellates from which all green plants (Viridiplantae) evolved. The molecular characterization of four different SAPs is presented. Three SAPs are type-2 membrane proteins with an arginine/alanine-rich short cytoplasmic tail and an extracellular domain that is most likely of bacterial origin. The fourth protein is a filamin-like protein. In addition, we report the presence of proteins similar to the integrin-associated proteins α-actinin (in transcriptomes of glaucophytes and some viridiplants), LIM-domain proteins, and integrin-associated kinase in transcriptomes of viridiplants, glaucophytes, and rhodophytes. We propose that the membrane proteins identified are the predicted linkers between scales and the cytoskeleton. These proteins are present in many green algae but are apparently absent from embryophytes. These proteins represent a new protein family we have termed gralins for green algal integrins. Gralins are absent from embryophytes. A model for the evolution of the cell surface proteins in Plantae is discussed.<br /> (© The Author(s) 2015. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.)
- Subjects :
- Algal Proteins analysis
Algal Proteins genetics
Computer Simulation
Evolution, Molecular
Membrane Glycoproteins analysis
Membrane Glycoproteins genetics
Microfilament Proteins chemistry
Plant Proteins chemistry
Protein Structure, Tertiary
Sequence Homology, Amino Acid
Algal Proteins chemistry
Chlorophyta genetics
Chlorophyta ultrastructure
Membrane Glycoproteins chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1759-6653
- Volume :
- 7
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Genome biology and evolution
- Publication Type :
- Academic Journal
- Accession number :
- 25977459
- Full Text :
- https://doi.org/10.1093/gbe/evv089