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Plant Cell, Vol. 12, 1153-1164, July 2000, Copyright © 2000, American Society of Plant Physiologists

SUT2, a Putative Sucrose Sensor in Sieve Elements

Laurence Barkera, Christina Kühna, Andreas Weisea, Alexander Schulzb, Christiane Gebhardtc, Brigitte Hirnera, Hanjo Hellmanna, Waltraud Schulzea, John M. Warda, and Wolf B. Frommera
a Plant Physiology, Zentrum für Molekularbiologie der Pflanzen (ZMBP), Universität Tübingen, Auf der Morgenstelle 1, D-72076 Tübingen, Germany
b Department of Plant Biology, Royal Veterinary and Agricultural University, KVL, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Copenhagen, Denmark
c Max Planck Institut für Züchtungsforschung, Carl von Linné Weg 10, 50829 Cologne, Germany

Correspondence to: Wolf B. Frommer, frommer{at}uni-tuebingen.de (E-mail), 49-7071-29-3287 (fax)

In leaves, sucrose uptake kinetics involve high- and low-affinity components. A family of low- and high-affinity sucrose transporters (SUT) was identified. SUT1 serves as a high-affinity transporter essential for phloem loading and long-distance transport in solanaceous species. SUT4 is a low-affinity transporter with an expression pattern overlapping that of SUT1. Both SUT1 and SUT4 localize to enucleate sieve elements of tomato. New sucrose transporter–like proteins, named SUT2, from tomato and Arabidopsis contain extended cytoplasmic domains, thus structurally resembling the yeast sugar sensors SNF3 and RGT2. Features common to these sensors are low codon bias, environment of the start codon, low expression, and lack of detectable transport activity. In contrast to LeSUT1, which is induced during the sink-to-source transition of leaves, SUT2 is more highly expressed in sink than in source leaves and is inducible by sucrose. LeSUT2 protein colocalizes with the low- and high-affinity sucrose transporters in sieve elements of tomato petioles, indicating that multiple SUT mRNAs or proteins travel from companion cells to enucleate sieve elements. The SUT2 gene maps on chromosome V of potato and is linked to a major quantitative trait locus for tuber starch content and yield. Thus, the putative sugar sensor identified colocalizes with two other sucrose transporters, differs from them in kinetic properties, and potentially regulates the relative activity of low- and high-affinity sucrose transport into sieve elements.




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