title: Characterization of the maize xylem sap proteome.
abstract: The xylem in plants has mainly been described as a conduit for water and minerals, but emerging evidence also indicates that the xylem contains protein. To study the proteins in xylem sap, we characterized the identity and composition of the maize xylem sap proteome. The composition of the xylem sap proteome in maize revealed proteins related to different phases of xylem differentiation including cell wall metabolism, secondary cell wall synthesis, and programmed cell death. Many proteins were found to be present as multiple isoforms and some of these isoforms are glycosylated. Proteins involved in defense mechanisms were also present in xylem sap and the sap proteins were shown to have antifungal activity in bioassays.
authors.affiliation: Donald Danforth Plant Science Center, 975 North Warson Road, Saint Louis, Missouri 63132, USA.
authors.forename: Sophie
authors.initials: S
authors.lastname: Alvarez
authors.forename: Jason Q D
authors.initials: JQ
authors.lastname: Goodger
authors.forename: Ellen L
authors.initials: EL
authors.lastname: Marsh
authors.forename: Sixue
authors.initials: S
authors.lastname: Chen
authors.forename: Victor S
authors.initials: VS
authors.lastname: Asirvatham
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Schachtman
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology; D015180:Electrophoresis, Gel, Two-Dimensional; D006031:Glycosylation; D006651:Histocytochemistry; D036103:Nanotechnology; D009492:Neurospora crassa / Q000187:drug effects; D010449:Peptide Mapping; D010936:Plant Extracts / Q000737:chemistry; D010940:Plant Proteins / Q000032:analysis / Q000302:isolation & purification; D018514:Plant Structures / Q000737:chemistry* / Q000502:physiology*; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D020543:Proteome / Q000032:analysis*; D020539:Sequence Analysis, Protein; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014357:Trypsin / Q000494:pharmacology; D003313:Zea mays / Q000033:anatomy & histology* / Q000737:chemistry* / Q000254:growth & development / Q000502:physiology
chemical_list: D000935:Antifungal Agents; D010936:Plant Extracts; D010940:Plant Proteins; D020033:Protein Isoforms; D020543:Proteome; D014357:Trypsin