Fractionation of the proteins of plant microbodies.
1. Glyoxysomes and peroxisomes have been isolated from dark- and light-grown seedlings of pumpkin (Cucurbita pepo) by sucrose-density-gradient centrifugation. 2. Pumpkin microbodies and castor-bean (Ricinus communis) glyoxysomes may be fractionated, by a combination of osmotic shock and treatment with KCl, into three distinct groups of proteins: readily soluble (matrix enzymes), solubilized in the presence of KCl (membrane-bound enzymes) and relatively insoluble (membrane ;ghost' proteins). 3. Sodium dodecyl sulphate-polyacrylamide-gel electrophoresis of ;ghost' fractions indicated that the membrane proteins were generally of low molecular weight; one gel band (mol.wt. 27000-28000) was common to all three microbodies. 4. Although there were major differences in the soluble protein components of pumpkin glyoxysomes and peroxisomes, electrophoresis of the pumpkin microbody ;ghosts' indicated that the membrane proteins were similar, four main components being common to each class of microbody (monomer molecular weights 42000, 34000, 27000 and 17000).
D002499:Centrifugation, Density Gradient; D004591:Electrophoresis, Polyacrylamide Gel; D005306:Fertilization; D008830:Microbodies / Q000032:analysis* / Q000201:enzymology; D008970:Molecular Weight; D009940:Organoids / Q000032:analysis*; D010940:Plant Proteins / Q000032:analysis*; D010944:Plants / Q000032:analysis*; D012967:Sodium Dodecyl Sulfate
D010940:Plant Proteins; D012967:Sodium Dodecyl Sulfate