A soybean sucrose binding protein independently mediates nonsaturable sucrose uptake in yeast.

A soybean sucrose binding protein independently mediates nonsaturable sucrose uptake in yeast. Heterologous expression of a cDNA encoding a 62-kD soybean sucrose binding protein in yeast demonstrates that this protein, independent of other plant proteins, mediates sucrose uptake across the plasma membrane. Sucrose binding protein-mediated sucrose uptake is nonsaturable up to 30 mM sucrose, is specific for sucrose, and is relatively insensitive to treatment with sulfhydryl-modifying reagents. Alteration of the external pH or pretreatment of the yeast cells with protonophores did not significantly affect the rate of 14C-sucrose uptake. This demonstrates that sucrose binding protein-mediated sucrose uptake is not dependent on H+ movement and delineates it from other plant sucrose transporters. Physiological characterization of sucrose uptake into higher plant cells has shown the presence of both saturable and nonsaturable uptake components. The nonsaturable mechanism is relatively insensitive to external pH, pretreatment with protonophores, and treatment with sulfhydryl-modifying reagents. Sucrose binding protein-mediated sucrose uptake in yeast mimics this physiologically described, but mechanistically undefined, nonsaturable sucrose uptake mechanism in higher plants. Functional characterization of the sucrose binding protein thus defines both a novel component of sucrose uptake and provides important insight into this nonsaturable sucrose uptake mechanism, which has remained enigmatic since its physiological description. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

A soybean sucrose binding protein independently mediates nonsaturable sucrose uptake in yeast.

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Publisher
American Society of Plant Biologist
Copyright
Copyright © 1996 by the American Society of Plant Biologists
ISSN
1040-4651
eISSN
1532-298X
D.O.I.
10.1105/tpc.8.2.271
Publisher site
See Article on Publisher Site

Abstract

Heterologous expression of a cDNA encoding a 62-kD soybean sucrose binding protein in yeast demonstrates that this protein, independent of other plant proteins, mediates sucrose uptake across the plasma membrane. Sucrose binding protein-mediated sucrose uptake is nonsaturable up to 30 mM sucrose, is specific for sucrose, and is relatively insensitive to treatment with sulfhydryl-modifying reagents. Alteration of the external pH or pretreatment of the yeast cells with protonophores did not significantly affect the rate of 14C-sucrose uptake. This demonstrates that sucrose binding protein-mediated sucrose uptake is not dependent on H+ movement and delineates it from other plant sucrose transporters. Physiological characterization of sucrose uptake into higher plant cells has shown the presence of both saturable and nonsaturable uptake components. The nonsaturable mechanism is relatively insensitive to external pH, pretreatment with protonophores, and treatment with sulfhydryl-modifying reagents. Sucrose binding protein-mediated sucrose uptake in yeast mimics this physiologically described, but mechanistically undefined, nonsaturable sucrose uptake mechanism in higher plants. Functional characterization of the sucrose binding protein thus defines both a novel component of sucrose uptake and provides important insight into this nonsaturable sucrose uptake mechanism, which has remained enigmatic since its physiological description.

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