title: Golgi enrichment and proteomic analysis of developing Pinus radiata xylem by free-flow electrophoresis.
abstract: Our understanding of the contribution of Golgi proteins to cell wall and wood formation in any woody plant species is limited. Currently, little Golgi proteomics data exists for wood-forming tissues. In this study, we attempted to address this issue by generating and analyzing Golgi-enriched membrane preparations from developing xylem of compression wood from the conifer Pinus radiata. Developing xylem samples from 3-year-old pine trees were harvested for this purpose at a time of active growth and subjected to a combination of density centrifugation followed by free flow electrophoresis, a surface charge separation technique used in the enrichment of Golgi membranes. This combination of techniques was successful in achieving an approximately 200-fold increase in the activity of the Golgi marker galactan synthase and represents a significant improvement for proteomic analyses of the Golgi from conifers. A total of thirty known Golgi proteins were identified by mass spectrometry including glycosyltransferases from gene families involved in glucomannan and glucuronoxylan biosynthesis. The free flow electrophoresis fractions of enriched Golgi were highly abundant in structural proteins (actin and tubulin) indicating a role for the cytoskeleton during compression wood formation. The mass spectrometry proteomics data associated with this study have been deposited to the ProteomeXchange with identifier PXD000557.
authors.affiliation: Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America.
authors.forename: Harriet T
authors.initials: HT
authors.lastname: Parsons
authors.affiliation: Scion, Rotorua, New Zealand.
authors.forename: Cristina S
authors.initials: CS
authors.lastname: Weinberg
authors.affiliation: Scion, Rotorua, New Zealand.
authors.forename: Lucy J
authors.initials: LJ
authors.lastname: Macdonald
authors.affiliation: Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America ; Department of Bioengineering, University of California, Berkeley, California, United States of America.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Adams
authors.affiliation: Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Petzold
authors.affiliation: Scion, Rotorua, New Zealand.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Strabala
authors.affiliation: Scion, Rotorua, New Zealand.
authors.forename: Armin
authors.initials: A
authors.lastname: Wagner
authors.affiliation: Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America.
authors.forename: Joshua L
authors.initials: JL
authors.lastname: Heazlewood
mesh_terms: D002462:Cell Membrane / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D002853:Chromatography, Liquid; D004586:Electrophoresis / Q000379:methods; D006056:Golgi Apparatus / Q000378:metabolism*; D028223:Pinus / Q000235:genetics* / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism*; D040901:Proteomics / Q000379:methods*; D053719:Tandem Mass Spectrometry; D014934:Wood / Q000235:genetics* / Q000378:metabolism
chemical_list: D010940:Plant Proteins