Biologia plantarum 46:285-288, 2003 | DOI: 10.1023/B:BIOP.0000022267.04735.66
The Fructose Transport Mechanism in Microsomal Membrane Vesicles from Rye Roots
- 1 Department of Biofunctional Science, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Japan
In a fructose-containing medium in which rye root-microsomal membrane vesicles had reached the equilibrium of uptake of fructose, the presence of both Mg2+ and ATP caused the efflux of fructose from the vesicles. Among nucleotides examined, ATP caused the largest efflux of fructose. The efflux of fructose dependent on Mg2+ and ATP was quite insensitive to a protonophore, carbonylcyanide m-chlorophenylhydrazone (CCCP), which actually abolished MgATP-dependent proton accumulation in the vesicles, while it was largely inhibited by vanadate, which inhibits ATP-binding cassette transporters (ABCTs). The Michaelis-Menten constant (Km) of the efflux of fructose was 0.4 mM. It was observed that fructose stimulated the ATPase activity of the vesicles and that vanadate markedly decreased the fructose-stimulated ATPase activity.
Keywords: ATP-binding cassette transporter; MgATP; ΔpH; Secale cereale
Subjects: ATP-binding cassette transporter; fructose transport mechanism; microsomal membrane vesicles; rye, fructose transport mechanism; saccharide transport mechanism; Secale cereale
Published: September 1, 2003Show citation
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