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Plant and Cell Physiology Advance Access originally published online on April 13, 2006
Plant and Cell Physiology 2006 47(6):743-747; doi:10.1093/pcp/pcj046
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The Maize Root Plasma Membrane H+-ATPase is Regulated by a Sugar-induced Transduction Pathway

Lorenzo Camoni, Mauro Marra, Alessandra Garufi, Sabina Visconti and Patrizia Aducci*

Department of Biology, University of Rome ‘Tor Vergata’, via della Ricerca Scientifica, 00133 Rome, Italy

* Corresponding author: E-mail, Aducci{at}uniroma2.it; Fax, +39-06-2023500.

H+-ATPase, the key enzyme for the energization of ion and nutrient transport across the plasma membrane, is activated by phosphorylation-dependent 14-3-3 binding. Since the involvement of 14-3-3 proteins in sugar sensing-regulated processes has recently emerged, here we address the question as to whether sugar sensing plays a role in the regulation of H+-ATPase. The data reported here show that sugar depletion inhibits the association of 14-3-3 proteins with H+-ATPase by hampering phosphorylation of the 14-3-3 binding site of the enzyme. By using non-metabolizable disaccharides, we show that H+-ATPase regulation by 14-3-3 proteins can involve a specific sugar perception and transduction mechanism.

(Received December 15, 2005; Accepted April 2, 2006)
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