title: Isolation of Arabidopsis Leaf Peroxisomes and the Peroxisomal Membrane.
abstract: To date, less than 150 proteins have been located to plant peroxisomes, indicating that unbiased large-scale approaches such as experimental proteome research are required to uncover the remaining yet unknown metabolic functions of this organelle as well as its regulatory mechanisms and membrane proteins. For experimental proteome research, Arabidopsis thaliana is the model plant of choice and an isolation methodology that obtains peroxisomes of sufficient yield and high purity is vital for research on this organelle. However, organelle enrichment is more difficult from Arabidopsis when compared to other plant species and especially challenging for peroxisomes. Leaf peroxisomes from Arabidopsis are very fragile in aqueous solution and show pronounced physical interactions with chloroplasts and mitochondria in vivo that persist in vitro and decrease peroxisome purity. Here, we provide a detailed protocol for the isolation of Arabidopsis leaf peroxisomes using two different types of density gradients (Percoll and sucrose) sequentially that yields approximately 120 μg of peroxisome proteins from 60 g of fresh leaf material. A method is also provided to assess the relative purity of the isolated peroxisomes by immunoblotting to allow selection of the purest peroxisome isolates. To enable the analysis of peroxisomal membrane proteins, an enrichment strategy using sodium carbonate treatment of isolated peroxisome membranes has been adapted to suit isolated leaf peroxisomes and is described here.
authors.affiliation: Biocentre Klein Flottbek, University of Hamburg, Hamburg, Germany. sigrun.reumann@uni-hamburg.de.|Centre for Organelle Research (CORE), Faculty of Science and Technology, University of Stavanger, Richard Johnsens gate 4, N-4021, Stavanger, Norway. sigrun.reumann@uni-hamburg.de.
authors.forename: Sigrun
authors.initials: S
authors.lastname: Reumann
authors.affiliation: Biocentre Klein Flottbek, University of Hamburg, Hamburg, Germany.
authors.forename: Piotr
authors.initials: P
authors.lastname: Lisik
mesh_terms: D017360:Arabidopsis / Q000737:chemistry* / Q000254:growth & development; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000302:isolation & purification*; D015415:Biomarkers / Q000737:chemistry; D015153:Blotting, Western; D002254:Carbonates / Q000737:chemistry; D002458:Cell Fractionation / Q000295:instrumentation / Q000379:methods*; D002499:Centrifugation, Density Gradient / Q000295:instrumentation / Q000379:methods; D002736:Chloroplasts / Q000737:chemistry; D003470:Culture Media / Q000737:chemistry; D012696:Glycine Hydroxymethyltransferase / Q000737:chemistry / Q000302:isolation & purification; D050537:Hydroxypyruvate Reductase / Q000737:chemistry / Q000302:isolation & purification; D007425:Intracellular Membranes / Q000737:chemistry; D008928:Mitochondria / Q000737:chemistry; D020675:Peroxisomes / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry* / Q000254:growth & development; D011205:Povidone / Q000737:chemistry; D020543:Proteome / Q000737:chemistry / Q000302:isolation & purification*; D012273:Ribulose-Bisphosphate Carboxylase / Q000737:chemistry / Q000302:isolation & purification; D012822:Silicon Dioxide / Q000737:chemistry; D013395:Sucrose / Q000737:chemistry
chemical_list: D029681:Arabidopsis Proteins; D015415:Biomarkers; D002254:Carbonates; D003470:Culture Media; D020543:Proteome; C005686:sodium carbonate; D013395:Sucrose; C016039:Percoll; D012822:Silicon Dioxide; D050537:Hydroxypyruvate Reductase; D012696:Glycine Hydroxymethyltransferase; D012273:Ribulose-Bisphosphate Carboxylase; D011205:Povidone
keywords: Arabidopsis; Organelle purity; Peroxisomal membrane; Peroxisome; Proteomics