AtUTr2 is an Arabidopsis thaliana nucleotide sugar transporter located in the Golgi apparatus capable of transporting UDP-galactose

Lorena Norambuena, Ricardo Nilo, Michael Handford, Francisca Reyes, Lorena Marchant, Lee Meisel, Ariel Orellana

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

The synthesis of noncellulosic polysaccharides and glycoproteins in the plant cell Golgi apparatus requires UDP-galactose as a substrate. We have cloned and characterized a nucleotide sugar transporter from Arabidopsis thaliana (L.) Heynh. named AtUTr2. Expression in tobacco and Saccharomyces cerevisiae and subsequent biochemical characterization indicate that AtUTr2 transports UDP-galactose, but not UDP-glucose, UDP-N-acetyl glucosamine, UDP-xylose, UDP-glucuronic acid, GDP-fucose or GDP-mannose. Experiments expressing an AtUTr2-GFP fusion protein in onion epidermal cells suggest that AtUTr2 is located in the Golgi apparatus. Finally, northern analysis indicates that the AtUTr2 transcript was more abundant in roots and calli although it was also present in other Arabidopsis organs but at lower levels. Therefore, AtUTr2 is a nucleotide sugar transporter capable of transporting UDP-galactose that may play an important role in the synthesis of galactose-containing glycoconjugates in Arabidopsis.

Original languageEnglish
Pages (from-to)521-529
Number of pages9
JournalPlanta
Volume222
Issue number3
DOIs
Publication statusPublished - Oct 2005

Keywords

  • Arabidopsis thaliana
  • Gene functional characterization
  • Golgi apparatus
  • Nucleotide sugar transporters

ASJC Scopus subject areas

  • Genetics
  • Plant Science

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