Novel calcium-binding GTPase (AtCBG) involved in ABA-mediated salt stress signaling in Arabidopsis

Kandakumar Jayasekaran, Kyung Nam Kim, Munusamy Vivekanandan, Jeong Sheop Shin, Sung Han Ok

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We have identified a novel Ca2+-signal sensing GTPase (643 amino acid residues with an estimated molecular mass of 79 kDa) from the Arabidopsis genome database. This protein contains a RHO-like GTPase domain at the N-terminus (15-184 amino acids) and two calcium-binding EF-hand motifs (199-227 and 319-347 amino acids, respectively). It has the capability to bind calcium and hydrolyze GTP; in addition, its GTPase activity is regulated by changes in Ca2+ concentration. The expression of this gene was induced by ABA and salt stresses, and specific knock-out mutants were highly sensitive to ABA and salt treatments. These findings suggest that this protein is a novel ABA- and salt stress-related Ca2+ signal transducer.

Original languageEnglish
Pages (from-to)1255-1262
Number of pages8
JournalPlant Cell Reports
Volume25
Issue number11
DOIs
Publication statusPublished - 2006 Nov

Bibliographical note

Funding Information:
Acknowledgements This project was funded by a grant from the Special Grant Research Program funded by the Ministry of Agriculture and Forestry of the Korean Government, and also supported by grants from the Plant Signaling Network Research Center, Korea Science and Engineering Foundation.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

Keywords

  • Abiotic stress
  • Ca
  • GTP-binding
  • Regulation of gene expression
  • Signal transduction

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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