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ST proteins, a new family of plant tandem repeat proteins with a DUF2775 domain mainly found in Fabaceae and Asteraceae
Autor(es)
Palabras clave
Biotic interaction
DUF2775 domain
ST proteins
Tandem repeat proteins
Fecha de publicación
2012
Resumen
Background: Many proteins with tandem repeats in their sequence have been described and classified according
to the length of the repeats: I) Repeats of short oligopeptides (from 2 to 20 amino acids), including structural cell
wall proteins and arabinogalactan proteins. II) Repeats that range in length from 20 to 40 residues, including
proteins with a well-established three-dimensional structure often involved in mediating protein-protein
interactions. (III) Longer repeats in the order of 100 amino acids that constitute structurally and functionally
independent units. Here we analyse ShooT specific (ST) proteins, a family of proteins with tandem repeats of
unknown function that were first found in Leguminosae, and their possible similarities to other proteins with
tandem repeats.
Results: ST protein sequences were only found in dicotyledonous plants, limited to several plant families, mainly
the Fabaceae and the Asteraceae. ST mRNAs accumulate mainly in the roots and under biotic interactions. Most ST
proteins have one or several Domain(s) of Unknown Function 2775 (DUF2775). All deduced ST proteins have a
signal peptide, indicating that these proteins enter the secretory pathway, and the mature proteins have tandem
repeat oligopeptides that share a hexapeptide (E/D)FEPRP followed by 4 partially conserved amino acids, which
could determine a putative N-glycosylation signal, and a fully conserved tyrosine. In a phylogenetic tree, the
sequences clade according to taxonomic group. A possible involvement in symbiosis and abiotic stress as well as in
plant cell elongation is suggested, although different STs could play different roles in plant development.
Conclusions: We describe a new family of proteins called ST whose presence is limited to the plant kingdom,
specifically to a few families of dicotyledonous plants. They present 20 to 40 amino acid tandem repeat sequences
with different characteristics (signal peptide, DUF2775 domain, conservative repeat regions) from the described
group of 20 to 40 amino acid tandem repeat proteins and also from known cell wall proteins with repeat
sequences. Several putative roles in plant physiology can be inferred from the characteristics found.
URI
DOI
10.1186/1471-2229-12-207
Aparece en las colecciones
- GIPACYCV. Artículos [59]
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Bioinformatics ST_BMC Plant Biology 2012.pdfEmbargado hasta: 2099-09-09
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