Ca 2+ -Dependent Protein Kinases and Stress Signal Transduction in Plants
- 13 December 1996
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 274 (5294) , 1900-1902
- https://doi.org/10.1126/science.274.5294.1900
Abstract
Stress responses in plants involve changes in the transcription of specific genes. The constitutively active mutants of two related Ca2+-dependent protein kinases (CDPK1 and CDPK1a) activate a stress-inducible promoter, bypassing stress signals. Six other plant protein kinases, including two distinct CDPKs, fail to mimic this stress signaling. The activation is abolished by a CDPK1 mutation in the kinase domain and diminished by a constitutively active protein phosphatase 2C that is capable of blocking responses to the stress hormone abscisic acid. A variety of functions are mediated by different CDPKs. CDPK1 and CDPK1a may be positive regulators controlling stress signal transduction in plants.Keywords
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