Abstract:
:Sugar compartmentation into vacuoles of higher plants is a very important physiological process, providing extra space for transient and long-term sugar storage and contributing to the osmoregulation of cell turgor and shape. Despite the long-standing knowledge of this subcellular sugar partitioning, the proteins responsible for these transport steps have remained unknown. We have identified a gene family in Arabidopsis consisting of three members homologous to known sugar transporters. One member of this family, Arabidopsis thaliana vacuolar glucose transporter 1 (AtVGT1), was localized to the vacuolar membrane. Moreover, we provide evidence for transport activity of a tonoplast sugar transporter based on its functional expression in bakers' yeast and uptake studies in isolated yeast vacuoles. Analyses of Atvgt1 mutant lines indicate an important function of this vacuolar glucose transporter during developmental processes like seed germination and flowering.
journal_name
Proc Natl Acad Sci U S Aauthors
Aluri S,Büttner Mdoi
10.1073/pnas.0610278104subject
Has Abstractpub_date
2007-02-13 00:00:00pages
2537-42issue
7eissn
0027-8424issn
1091-6490pii
0610278104journal_volume
104pub_type
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