Journal Article

The Maize Root Plasma Membrane H<sup>+</sup>-ATPase is Regulated by a Sugar-induced Transduction Pathway

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 6, pages 743-747
Published in print June 2006 | ISSN: 0032-0781
Published online June 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj046
The Maize Root Plasma Membrane H+-ATPase is Regulated by a Sugar-induced Transduction Pathway

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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.

Keywords: 14-3-3 proteins; H+-ATPase; Signal transduction; Sugar sensing; Zea mays; CHX, cycloheximide; MC, mycrocystin; OKA, okadaic acid

Journal Article.  3160 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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