1V1F

Structure of the Arabidopsis thaliana SOS3 complexed with Calcium(II) and Manganese(II) ions

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 

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This is version 1.3 of the entry. See complete history. 


Literature

The Structure of the Arabidopsis Thaliana SOS3: Molecular Mechanism of Sensing Calcium for Salt Stress Response

Sanchez-Barrena, M.J., Martinez-Ripoll, M., Zhu, J.K., Albert, A.

(2005) J Mol Biol 345: 1253

  • DOI: 10.1016/j.jmb.2004.11.025
  • Primary Citation of Related Structures:  
    1V1F, 1V1G

  • PubMed Abstract: 

    • The Arabidopsis thaliana SOS3 gene encodes a calcium sensor that is required for plant salt tolerance. The SOS3 protein binds to and activates the self-inhibited SOS2 protein kinase, which mediates the expression and activities of various transporters important for ion homeostasis under salt stress ...

    The Arabidopsis thaliana SOS3 gene encodes a calcium sensor that is required for plant salt tolerance. The SOS3 protein binds to and activates the self-inhibited SOS2 protein kinase, which mediates the expression and activities of various transporters important for ion homeostasis under salt stress. SOS3 belongs to a unique family of calcium-binding proteins that contain two pairs of EF hand motifs with four putative metal-binding sites. We report the crystal structure of a dimeric SOS3 protein in complex with calcium, and with calcium and manganese. Analytical ultracentrifugation experiments and circular dichroism measurements show that calcium binding is responsible for the dimerization of SOS3. This leads to a change in the global shape and surface properties of the protein that may be sufficient to transmit the Ca(2+) signal elicited during salt stress.

    Organizational Affiliation: 

    Grupo de Cristalografía Macromolecular y Biología Estructural, Instituto de Química Física "Rocasolano", Consejo Superior de Investigaciones Científicas, Serrano 119, E-28006 Madrid, Spain.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CALCINEURIN B-LIKE PROTEIN 4A222Arabidopsis thalianaMutation(s): 0 
Gene Names: CBL4, SOS3, At5g24270, MOP9.8
UniProt
Find proteins for O81223 (Arabidopsis thaliana)
Explore O81223 
Go to UniProtKB:  O81223
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO81223
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IOD
Query on IOD
Download Ideal Coordinates CCD File 
B [auth A],
C [auth A],
D [auth A],
E [auth A],
L [auth A],
B [auth A],
C [auth A],
D [auth A],
E [auth A],
L [auth A],
M [auth A],
N [auth A]
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M		 Ligand Interaction
MPD
Query on MPD
Download Ideal Coordinates CCD File 
J [auth A],
K [auth A]		(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N		 Ligand Interaction
MN
Query on MN
Download Ideal Coordinates CCD File 
I [auth A]MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.9α = 90
b = 91.9β = 90
c = 85.6γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
CCP4phasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-01-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-10-16
    Changes: Data collection, Experimental preparation, Other