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The plant Ca2+-ATPase repertoire: biochemical features and physiological functions

Authors

  • M. C. Bonza,

    1. Dipartimento di Biologia “L. Gorini”, Università degli Studi di Milano, Istituto di Biofisica del CNR, Sezione di Milano, Milano, Italy
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  • M. I. De Michelis

    1. Dipartimento di Biologia “L. Gorini”, Università degli Studi di Milano, Istituto di Biofisica del CNR, Sezione di Milano, Milano, Italy
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M. I. De Michelis, Dipartimento di Biologia, Università degli Studi di Milano, via G. Celoria 26, 20133 Milano, Italy.
E-mail: mariaida.demichelis@unimi.it

Editor
A. Weber

Abstract

Ca2+-ATPases are P-type ATPases that use the energy of ATP hydrolysis to pump Ca2+ from the cytoplasm into intracellular compartments or into the apoplast. Plant cells possess two types of Ca2+-pumping ATPase, named ECAs (for ER-type Ca2+-ATPase) and ACAs (for auto-inhibited Ca2+-ATPase). Each type comprises different isoforms, localised on different membranes. Here, we summarise available knowledge of the biochemical characteristics and the physiological role of plant Ca2+-ATPases, greatly improved after gene identification, which allows both biochemical analysis of single isoforms through heterologous expression in yeast and expression profiling and phenotypic analysis of single isoform knock-out mutants.

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