Plant Secretomes: Current Status and Future Perspectives (Research Note) (Report) Plant Secretomes: Current Status and Future Perspectives (Research Note) (Report)

Plant Secretomes: Current Status and Future Perspectives (Research Note) (Report‪)‬

Plant OMICS 2011, March-April, 4, 2

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Introduction Plant secreted proteins play important biological roles in cell wall structure, cellular communication, and the hostathogen relationships (Isaacson and Rose, 2006; Kamoun, 2009). One well studied system was germinating barley seed in which [-alpha]-amylase was found to be synthesized in the aleurone layer and secreted into the endosperm to break down starch (Ranki and Sopanen, 1984; Jones and Robinson, 1989 for review). More recently, advances in proteomic analytic techniques, along with the complete sequencing of Arabidopsis thaliana and Oryza sativa genomes, resulted in many secreted proteins, including the cell wall proteome, being identified (Boudart et al., 2007; Agrawal et al., 2010 for review). The term secretome was first used to describe genome-wide study of the signal peptide-dependent secreted proteins and the protein secretion machineries in Bacillus subtilis, a Gram-positive bacterium (Tjalsma et al., 2000). Though it is still occasionally used to include the set of proteins involved in the secretory pathway (Simpson et al., 2007), however, the term is more often limited to include only the secreted proteins (Greenbaum et al., 2001; Hathout, 2007; Bouws et al., 2008). Recently Agrawal et al. (2010) comprehensively reviewed the state of progress in plant secretomics research, including experimental systems and techniques for identification of secreted proteins in plants. A revised secretome definition was proposed as "the global group of secreted proteins into the extracellular space by a cell, tissue, organ or organism at any given time and conditions through known and unknown secretory mechanisms involving constitutive and regulated secretory organells" (Agrawal et al., 2010). Thus in this work, plant secretomes refer to all proteins which are secreted into the extracellular regions or extracellular space, i. e., outside of the plasma membrane, of plant cells or tissues. With the improvement of sequencing technology and the reduced cost of sequencing, the genomes of more plant species are being completely sequenced. Currently there are 24 land plants having complete or draft genome sequences available and 72 land plant species with genome sequencing in progress (http://www.ncbi.nlm.nih.gov/genomes/static/gpstat.html). The ability to predict the protein coding genes and the subcellular locations of these encoded proteins is essential for the functional annotation of the genomes. In an attempt to better predict and analyze all secreted proteins, i. e. secretomes, from plants, we analyzed all the plant secreted proteins so far manually curated and annotated in the UniProt database (http://www.uniprot.org/) (The UniProt Consortium, 2010). The information obtained through this analysis is anticipated to be useful in developing methods to accurately predict plant secretomes for the construction of a plant secretome database.

GENRE
Zaken en persoonlijke financiën
UITGEGEVEN
2011
1 maart
TAAL
EN
Engels
LENGTE
14
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UITGEVER
Southern Cross Publisher
GROOTTE
253,6
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