4D28

Crystal structure of the kinase domain of CIPK24/SOS2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.271 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Basis of the Regulatory Mechanism of the Plant Cipk Family of Protein Kinases Controlling Ion Homeostasis and Abiotic Stress

Chaves-Sanjuan, A.Sanchez-Barrena, M.J.Gonzalez-Rubio, J.M.Moreno, M.Ragel, P.Jimenez, M.Pardo, J.M.Martinez-Ripoll, M.Quintero, F.J.Albert, A.

(2014) Proc.Natl.Acad.Sci.USA 111: E4532

  • DOI: 10.1073/pnas.1407610111
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • 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 ...

    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.


    Organizational Affiliation

    Departamento de Cristalografía y Biología Estructural, Instituto de Química Física "Rocasolano," Consejo Superior de Investigaciones Científicas, Madrid E-28006, Spain; and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CBL-INTERACTING SERINE/THREONINE-PROTEIN KINASE 24
A, B, C, D
446Arabidopsis thalianaMutation(s): 7 
Gene Names: CIPK24 (SnRK3.11, SOS2)
EC: 2.7.11.1
Find proteins for Q9LDI3 (Arabidopsis thaliana)
Go to UniProtKB:  Q9LDI3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.271 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 69.111α = 104.85
b = 71.353β = 100.32
c = 77.834γ = 118.96
Software Package:
Software NamePurpose
SCALAdata scaling
MOLREPphasing
XDSdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2014-11-05
    Type: Database references
  • Version 1.2: 2014-12-17
    Type: Data collection
  • Version 1.3: 2017-12-06
    Type: Data collection, Structure summary