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H + ‐sugar antiport as the mechanism of sugar uptake by sugarcane vacuoles
Author(s) -
Thom Margaret,
Komor Ewald
Publication year - 1984
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(84)81004-2
Subject(s) - vacuole , antiporter , sugar , chemistry , depolarization , biophysics , membrane , sucrose , membrane transport , efflux , biochemistry , biology , cytoplasm
The uptake of 3‐ O ‐methylglucose (3‐OMG) by vacuoles isolated from sugarcane cells caused a depolarization of the internally positive membrane potential and a decrease of the pH gradient. The uptake of sugar was accompanied by a corresponding efflux of protons out of vacuoles with a stoichiometry of 1:1. The data support a model whereby sugar is transported via an H + ‐antiport system.