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Published on March 2, 2007; 10.1104/pp.106.094102

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Received December 4, 2006
Accepted February 20, 2007

Characterization of Lipid Rafts from Medicago Truncatula Root Plasma Membranes: A Proteomic Study Reveals the Presence of a Raft-associated Redox System

Benoit Lefebvre , Fabienne Furt , Marie-Andrée Hartmann , Louise V. Michaelson , Jean-Pierre Carde , Françoise Sargueil-Boiron , Michel Rossignol , Johnathan A. Napier , Julie Cullimore , Jean-Jacques Bessoule , and Sébastien Mongrand *

Laboratoire des Interactions Plantes Micro-organismes UMR CNRS-INRA 2594/441; BP 52627, 31326 Castanet-Tolosan Cedex, France; Laboratoire de Biogenèse Membranaire, UMR 5200-CNRS-Université Victor Segalen Bordeaux 2, 146, rue Léo Saignat, 33076 Bordeaux Cedex, France; Plate-forme proteomique, IFR40 Castanet-Tolosan; Plateau technique Imagerie / Cytologie. INRA, IFR 103, B.P. 81, 33883 Villenave d'Ornon cedex, France; Institut de Biologie Moléculaire des Plantes, UPR-CNRS 2357, 67083 Strasbourg Cedex, France; Crop Performance and Improvement division, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, United Kingdom

* Corresponding author; email: sebastien.mongrand{at}biomemb.u-bordeaux2.fr.

Several studies have provided new insights into the role of sphingolipid/sterol-rich domains so called "lipid rafts" of the plasma membrane from mammalian cells, and more recently from leaves, cell cultures and seedlings of higher plants. Here we show that lipid raft domains, defined as Triton X-100-insoluble membranes, can also be prepared from Medicago truncatula root plasma membranes. These domains have been extensively characterized by ultra-structural studies as well as by analysis of their content in lipids and proteins. M. truncatula lipid domains are shown to be enriched in sphingolipids and {Delta}7-sterols, with spinasterol as the major compound, but also in steryl-glycosides and acyl-steryl-glycosides. A large number of proteins (i.e. 270) have been identified. Among them, receptor kinases and proteins related to signaling, cellular trafficking and cell wall functioning were well represented whereas those involved in transport and metabolism were poorly represented. Evidence is also given for the presence of a complete plasma membrane redox system in the lipid rafts.




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