Transport of malate and chloride into barley mesophyll vacuoles Different carriers are involved

Transport of malate and chloride across the tonoplast of barley mesophyll vacuoles has been compared. Whereas malate inhibited chloride uptake, 1,2,3-benzenetricarboxylic acid, a potent inhibitor of malate uptake which is assumed not to cross the tonoplast, was ineffective. In contrast to chloride u...

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Bibliographic Details
Published in:FEBS letters 1990-02, Vol.261 (1), p.109-111
Main Authors: Martinoia, Enrico, Vogt, Esther, Amrhein, Nikolaus
Format: Article
Language:English
Subjects:
Biological and medical sciences
Cell physiology
Chloride
Fundamental and applied biological sciences. Psychology
Hordeum vulgare
Malate
Membrane and intracellular transports
mesophyll
Molecular and cellular biology
Transport
Vacuole
vacuoles
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Summary:Transport of malate and chloride across the tonoplast of barley mesophyll vacuoles has been compared. Whereas malate inhibited chloride uptake, 1,2,3-benzenetricarboxylic acid, a potent inhibitor of malate uptake which is assumed not to cross the tonoplast, was ineffective. In contrast to chloride uptake, malate uptake was inactivated by pyridoxal phosphate and phenylglyoxal. The malate transport system could be protected against pyridoxal phosphate when a substrate such as 1,2,3-benzenetricarboxylic acid was present in the preincubation medium. It is concluded that the transfer of malate and chloride across the tonoplast is mediated by different systems.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(90)80648-3