Enrichment and identification of integral membrane proteins from barley aleurone layers by reversed-phase chromatography, SDS-PAGE, and LC-MS/MS.
The plasma membrane of the cereal aleurone layer is the site of perception of germination signals and release of enzymes to the starchy endosperm. Analysis of membrane proteins is challenging due to their hydrophobicity and low abundance; thus, little is known about the membrane proteins involved in seed germination. A membrane fraction highly enriched for the plasma membrane H+-ATPase was prepared from barley aleurone layers by aqueous two-phase partitioning. Because detergent and salt washes did not efficiently remove soluble proteins from the membrane preparations, an alternative procedure was developed, comprising batch reversed-phase chromatography with stepwise elution of hydrophobic proteins by 2-propanol. Proteins in the most hydrophobic fraction were separated by SDS-PAGE and identified by LC-MS/MS and barley EST sequence database search. The method was efficient for enrichment of integral membrane proteins with relatively low levels of soluble contaminating proteins. Forty-six proteins associated with barley aleurone plasma membranes were identified, including proteins with more than 10 transmembrane domains. Among the identified proteins were two new isoforms of the plasma membrane H+-ATPase, two proteins possibly involved in ion-channel regulation, and two proteins of unknown function. This represents the first analysis of membrane proteins involved in seed germination using a proteomics approach.
Hynek
Radovan
R
Enzyme and Protein Chemistry Group, BioCentrum-DTU, Søltofts Plads, Building 224, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
Svensson
Birte
B
Jensen
Ole Nørregaard
ON
Barkholt
Vibeke
V
Finnie
Christine
C
D000595:Amino Acid Sequence; D002853:Chromatography, Liquid / Q000379:methods; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D004798:Enzymes / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D020224:Expressed Sequence Tags; D001467:Hordeum / Q000737:chemistry* / Q000235:genetics; D013058:Mass Spectrometry / Q000379:methods; D008565:Membrane Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry; D010449:Peptide Mapping; D010940:Plant Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification
D004798:Enzymes; D008565:Membrane Proteins; D010446:Peptide Fragments; D010940:Plant Proteins