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Structural basis of the regulatory mechanism of the plant CIPK family of protein kinases controlling ion homeostasis and abiotic stress

AuthorsChaves Sanjuán, Antonio; Sánchez-Barrena, María José ; González-Rubio, Juana M.; Moreno, M. ; Ragel, Paula ; Jiménez, M.; Pardo, José M. ; Martínez-Ripoll, Martín ; Quintero, Francisco J. ; Albert, Armando
KeywordsAbiotic stress
Ion transport
Issue Date2014
PublisherNational Academy of Sciences (U.S.)
CitationProceedings of the National Academy of Sciences 111(42): E4532- E4541 (2014)
Abstract© 2014, National Academy of Sciences. All rights reserved. Plant cells have developed specific protective molecular machinery against environmental stresses. The family of CBL-interacting protein kinases (CIPK) and their interacting activators, the calcium sensors calcineurin B-like (CBLs), work together to decode calcium signals elicited by stress situations. The molecular basis of biological activation of CIPKs relies on the calcium-dependent interaction of a self-inhibitory NAF motif with a particular CBL, the phosphorylation of the activation loop by upstream kinases, and the subsequent phosphorylation of the CBL by the CIPK. We present the crystal structures of the NAF-truncated and pseudophosphorylated kinase domains of CIPK23 and CIPK24/SOS2. In addition, we provide biochemical data showing that although CIPK23 is intrinsically inactive and requires an external stimulation, CIPK24/SOS2 displays basal activity. This data correlates well with the observed conformation of the respective activation loops: Although the loop of CIPK23 is folded into a well-ordered structure that blocks the active site access to substrates, the loop of CIPK24/SOS2 protrudes out of the active site and allows catalysis. These structures together with biochemical and biophysical data show that CIPK kinase activity necessarily requires the coordinated releases of the activation loop from the active site and of the NAF motif from the nucleotide-binding site. Taken all together, we postulate the basis for a conserved calcium-dependent NAF-mediated regulation of CIPKs and a variable regulation by upstream kinases.
Description10 páginas.-- 6 figuras.-- 77 referencias.-- This article contains supporting information online at http://www.pnas.org/lookup/suppl/doi:10.1073/pnas.1407610111/-/DCSupplemental
Data deposition: The atomic coordinates have been deposited in the Protein Data Bank (PDB), www.pdb.org (PDB ID codes 4CZT, 4CZU, and 4D28).
Publisher version (URL)http://dx.doi.org/10.1073/pnas.1407610111
Identifiersdoi: 10.1073/pnas.1407610111
issn: 1091-6490
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