A new picture of cell wall protein dynamics in elongating cells of Arabidopsis thaliana: confirmed actors and newcomers.
BACKGROUND
Cell elongation in plants requires addition and re-arrangements of cell wall components. Even if some protein families have been shown to play roles in these events, a global picture of proteins present in cell walls of elongating cells is still missing. A proteomic study was performed on etiolated hypocotyls of Arabidopsis used as model of cells undergoing elongation followed by growth arrest within a short time.


RESULTS
Two developmental stages (active growth and after growth arrest) were compared. A new strategy consisting of high performance cation exchange chromatography and mono-dimensional electrophoresis was established for separation of cell wall proteins. This work allowed identification of 137 predicted secreted proteins, among which 51 had not been identified previously. Apart from expected proteins known to be involved in cell wall extension such as xyloglucan endotransglucosylase-hydrolases, expansins, polygalacturonases, pectin methylesterases and peroxidases, new proteins were identified such as proteases, proteins related to lipid metabolism and proteins of unknown function.


CONCLUSIONS
This work highlights the CWP dynamics that takes place between the two developmental stages. The presence of proteins known to be related to cell wall extension after growth arrest showed that these proteins may play other roles in cell walls. Finally, putative regulatory mechanisms of protein biological activity are discussed from this global view of cell wall proteins.
Irshad
Muhammad
M
Surfaces cellulaires et Signalisation chez les Végétaux, UMR 5546 CNRS - UPS-Université de Toulouse, Pôle de Biotechnologie Végétale, 24 chemin de Borde-Rouge, BP 42617 Auzeville, 31326 Castanet-Tolosan, France. muhammad@scsv.ups-tlse.fr
Canut
Hervé
H
Borderies
Gisèle
G
Pont-Lezica
Rafael
R
Jamet
Elisabeth
E
D017360:Arabidopsis / Q000254:growth & development* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000302:isolation & purification* / Q000378:metabolism; D002473:Cell Wall / Q000378:metabolism*; D002852:Chromatography, Ion Exchange; D019295:Computational Biology; D004591:Electrophoresis, Polyacrylamide Gel; D018745:Genome, Plant; D018546:Hypocotyl / Q000254:growth & development / Q000378:metabolism; D020543:Proteome; D040901:Proteomics
D029681:Arabidopsis Proteins; D020543:Proteome
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