Calcium-Modulated Proteins: Targets of Intracellular Calcium Signals in Higher Plants

Calcium-Modulated Proteins: Targets of Intracellular Calcium Signals in Higher Plants PROPERTIES OF CALCIUM-MODULATED PROTEINS The principal targets of calcium signals in eukaryotes are members of a calcium-binding protein family known as the calcium-modulated proteins. As recently reviewed by Moncrief et al ( l 1 8) , over different calcium­ modulated proteins have been characterized. This diversity of calcium recep­ tors reflects the specialized structural and functional features required to carry out the myriad of calcium-dependent cellular responses. The common feature present in all of these proteins are calcium-binding domain known as the EF hand (reviewed in 2-8 copies of a specialized helix-loop-helix 1 1 8 and 175). The structural properties of the EF-hand domain allow calcium-modulated proteins to bind calcium reversibly with dissociation constants in the micro­ molar to submicromolar range. Additionally, calcium binding to these pro­ teins stimulates a change in conformation resulting in a change in activity. These features allow the calcium-modulated proteins to sense and respond to the small, transient changes in intracellular calcium concentration (e.g. cations such as Mg2+ and K I • 1 0-7 -6 M in plant cells; 1 97) against a high background concentration of other to 10 Most of the calcium-modulated proteins described to date have been iso­ lated from http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

Calcium-Modulated Proteins: Targets of Intracellular Calcium Signals in Higher Plants

Annual Review of Plant Biology, Volume 43 (1) – Jun 1, 1992

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Publisher
Annual Reviews
Copyright
Copyright 1992 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
1040-2519
DOI
10.1146/annurev.pp.43.060192.002111
Publisher site
See Article on Publisher Site

Abstract

PROPERTIES OF CALCIUM-MODULATED PROTEINS The principal targets of calcium signals in eukaryotes are members of a calcium-binding protein family known as the calcium-modulated proteins. As recently reviewed by Moncrief et al ( l 1 8) , over different calcium­ modulated proteins have been characterized. This diversity of calcium recep­ tors reflects the specialized structural and functional features required to carry out the myriad of calcium-dependent cellular responses. The common feature present in all of these proteins are calcium-binding domain known as the EF hand (reviewed in 2-8 copies of a specialized helix-loop-helix 1 1 8 and 175). The structural properties of the EF-hand domain allow calcium-modulated proteins to bind calcium reversibly with dissociation constants in the micro­ molar to submicromolar range. Additionally, calcium binding to these pro­ teins stimulates a change in conformation resulting in a change in activity. These features allow the calcium-modulated proteins to sense and respond to the small, transient changes in intracellular calcium concentration (e.g. cations such as Mg2+ and K I • 1 0-7 -6 M in plant cells; 1 97) against a high background concentration of other to 10 Most of the calcium-modulated proteins described to date have been iso­ lated from

Journal

Annual Review of Plant BiologyAnnual Reviews

Published: Jun 1, 1992

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