The Plant Cell, Vol. 13, 2283-2295,
October 2001, Copyright © 2001,
American Society of Plant Biologists
Identification and Characterization of GONST1, a Golgi-Localized GDP-Mannose Transporter in Arabidopsis
Timothy C. Baldwin1,a,
Michael G. Handford1,a,
Maria-Isabel Yuseffb,
Ariel Orellanab and
Paul Dupree2,a
a Department of Biochemistry, University of Cambridge, Building O, Downing Site, Cambridge CB2 1QW, United Kingdom
b Department of Biology, Faculty of Sciences, Millennium Institute for Cell Biology and Biotechnology, University of Chile, Casilla 653, Santiago, Chile
2 To whom correspondence should be addressed. E-mail p.dupree{at}bioc.cam.ac.uk; fax 44-1223-333345
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 transportdefective yeast mutant (vrg4-2), and Golgi-rich vesicles from the complemented strain displayed increased GDP-mannose transport activity. GONST1 promoter:: -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.
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