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Plant Physiol, January 2003, Vol. 131, pp. 70-77

AtSTP6, a New Pollen-Specific H+-Monosaccharide Symporter from Arabidopsis1

Joachim Scholz-Starke, Michael Büttner, and Norbert Sauer*

Molekulare Pflanzenphysiologie, Universität Erlangen-Nürnberg, Staudtstrasse 5, D-91058 Erlangen, Germany

This paper describes the molecular, kinetic, and physiological characterization of AtSTP6, a new member of the Arabidopsis H+/monosaccharide transporter family. The AtSTP6 gene (At3g05960) is interrupted by two introns and encodes a protein of 507 amino acids containing 12 putative transmembrane helices. Expression in yeast (Saccharomyces cerevisiae) shows that AtSTP6 is a high-affinity (Km = 20 µM), broad-spectrum, and uncoupler-sensitive monosaccharide transporter that is targeted to the plasma membrane and that can complement a growth deficiency resulting from the disruption of most yeast hexose transporter genes. Analyses of AtSTP6-promoter::GUS plants and in situ hybridization experiments detected AtSTP6 expression only during the late stages of pollen development. A transposon-tagged Arabidopsis mutant was isolated and homozygous plants were analyzed for potential effects of the Atstp6 mutation on pollen viability, pollen germination, fertilization, and seed production. However, differences between wild-type and mutant plants could not be observed.

1 This work was supported by the Deutsche Forschungsgemeinschaft (grant nos. SA382/10 and GRK40/3 to N.S.).

* Corresponding author; e-mail nsauer{at}biologie.uni-erlangen.de; fax 49-09131-85-28751.

© 2003 American Society of Plant Biologists


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