title: Identification and characterization of GONST1, a golgi-localized GDP-mannose transporter in Arabidopsis.
abstract: Transport of nucleotide sugars across the Golgi apparatus membrane is required for the luminal synthesis of a variety of plant cell surface components. We identified an Arabidopsis gene encoding a nucleotide sugar transporter (designated GONST1) that we have shown by transient gene expression to be localized to the Golgi. GONST1 complemented a GDP-mannose transport-defective yeast mutant (vrg4-2), and Golgi-rich vesicles from the complemented strain displayed increased GDP-mannose transport activity. GONST1 promoter::beta-glucuronidase studies suggested that this gene is expressed ubiquitously. The identification of a Golgi-localized nucleotide sugar transporter from plants will allow the study of the importance of this class of proteins in the synthesis of plant cell surface components such as cell wall polysaccharides.
authors.affiliation: Department of Biochemistry, University of Cambridge, Building O, Downing Site, Cambridge CB2 1QW, United Kingdom.
authors.forename: T C
authors.initials: TC
authors.lastname: Baldwin
authors.forename: M G
authors.initials: MG
authors.lastname: Handford
authors.forename: M I
authors.initials: MI
authors.lastname: Yuseff
authors.forename: A
authors.initials: A
authors.lastname: Orellana
authors.forename: P
authors.initials: P
authors.lastname: Dupree
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000166:cytology / Q000235:genetics* / Q000254:growth & development; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D017931:DNA Primers; D006031:Glycosylation; D006056:Golgi Apparatus / Q000378:metabolism*; D007425:Intracellular Membranes / Q000378:metabolism; D026901:Membrane Transport Proteins; D018613:Microscopy, Confocal; D008969:Molecular Sequence Data; D011487:Protein Conformation; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D029681:Arabidopsis Proteins; D002352:Carrier Proteins; D017931:DNA Primers; C428326:GDP-mannose transporter; C445096:GONST1 protein, Arabidopsis; D026901:Membrane Transport Proteins