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IN BRIEF

A Family of Novel Monosaccharide Transporters Involved in Vacuolar Sugar Transport in Arabidopsis

neckardt{at}aspb.org

Wormit et al. (pages 3476–3490) present a detailed analysis of a group of three higher-plant monosaccharide transporters in Arabidopsis named TONOPLAST MONOSACCHARIDE TRANSPORTER1 (TMT1), TMT2, and TMT3. The authors characterize the transport activity of TMT1, report on the subcellular localization of the proteins, investigate the activities of the promoters, and characterize T-DNA insertion lines of all three genes. They show that TMT proteins from Arabidopsis reside in the tonoplast and that these transporters play a central role in vacuolar hexose transport, mainly under stress conditions. TMT1, which is the most highly expressed of the TMT genes in Arabidopsis, was strongly induced in response to drought and cold stress. An analysis of carbohydrate uptake into isolated vacuoles showed that cold treatment induced vacuolar accumulation of glucose in the wild type, but tmt1 knockout lines had a substantially reduced capacity to import glucose into the vacuole. The work demonstrates that TMT proteins are involved in maintaining cellular glucose homeostasis and that they play a role in plant stress responses.

View larger version (104K): [in this window] [in a new window] [as a PowerPoint slide]   TMT1-GFP expression in seedlings (left) and flowers (right).

www.plantcell.org/cgi/doi/10.1105/tpc.107.181211

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Molecular Identification and Physiological Characterization of a Novel Monosaccharide Transporter from Arabidopsis Involved in Vacuolar Sugar Transport

Alexandra Wormit, Oliver Trentmann, Ingmar Feifer, Christian Lohr, Joachim Tjaden, Stefan Meyer, Ulrike Schmidt, Enrico Martinoia, and H. Ekkehard Neuhaus
Plant Cell 2006 18: 3476-3490. [Abstract] [Full Text]  

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Related articles in Plant Cell Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Eckardt, N. A. Search for Related Content PubMed Articles by Eckardt, N. A. Agricola Articles by Eckardt, N. A.