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Functional conservation between yeast and plant endosomal Na+/H+ antiporters

AuthorsQuintero, Francisco J. ; Blatt, Michael R.; Pardo, José M.
KeywordsSodium/proton antiporter
Sodium compartmentation
Arabidopsis thaliana
Saccharomyces cerevisiae
Issue Date14-Apr-2000
CitationFebs Letters 471(2-3): 224-228 (2000)
AbstractVacuolar compartmentation of Na+ is an essential mechanism for salinity tolerance since it lowers cytosolic Na+ levels while contributing to osmotic adjustment for cell turgor and expansion. The AtNHX1 protein of Arabidopsis thaliana substituted functionally for ScNHX1, the endosomal Na+/H+ antiporter of yeast. Ion tolerance conferred by AtNHX1 and ScNHX1 correlated with ion uptake into an intracellular pool that was energetically dependent on the vacuolar (H+)ATPase. AtNHX1 localized to vacuolar membrane fractions of yeast. Hence, both transporters share an evolutionarily conserved function in Na+ compartmentation. AtNHX1 mRNA levels were upregulated by ABA and NaCl treatment in leaf but not in root tissue.
Description5 pages, 4 figures.
Publisher version (URL)http://dx.doi.org/10.1016/S0014-5793(00)01412-5
Appears in Collections:(IRNAS) Artículos
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