1EXR

THE 1.0 ANGSTROM CRYSTAL STRUCTURE OF CA+2 BOUND CALMODULIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.00 Å
  • R-Value Free: 0.163 
  • R-Value Observed: 0.134 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The 1.0 A crystal structure of Ca(2+)-bound calmodulin: an analysis of disorder and implications for functionally relevant plasticity

Wilson, M.A.Brunger, A.T.

(2000) J Mol Biol 301: 1237-1256

  • DOI: 10.1006/jmbi.2000.4029
  • Primary Citation of Related Structures:  
    1EXR

  • PubMed Abstract: 
  • Calmodulin (CaM) is a highly conserved 17 kDa eukaryotic protein that can bind specifically to over 100 protein targets in response to a Ca(2+) signal. Ca(2+)-CaM requires a considerable degree of structural plasticity to accomplish this physiological ro ...

    Calmodulin (CaM) is a highly conserved 17 kDa eukaryotic protein that can bind specifically to over 100 protein targets in response to a Ca(2+) signal. Ca(2+)-CaM requires a considerable degree of structural plasticity to accomplish this physiological role; however, the nature and extent of this plasticity remain poorly characterized. Here, we present the 1.0 A crystal structure of Paramecium tetraurelia Ca(2+)-CaM, including 36 discretely disordered residues and a fifth Ca(2+) that mediates a crystal contact. The 36 discretely disordered residues are located primarily in the central helix and the two hydrophobic binding pockets, and reveal correlated side-chain disorder that may assist target-specific deformation of the binding pockets. Evidence of domain displacements and discrete backbone disorder is provided by translation-libration-screw (TLS) analysis and multiconformer models of protein disorder, respectively. In total, the evidence for disorder at every accessible length-scale in Ca(2+)-CaM suggests that the protein occupies a large number of hierarchically arranged conformational substates in the crystalline environment and may sample a quasi-continuous spectrum of conformations in solution. Therefore, we propose that the functionally distinct forms of CaM are less structurally distinct than previously believed, and that the different activities of CaM in response to Ca(2+) may result primarily from Ca(2+)-mediated alterations in the dynamics of the protein.


    Organizational Affiliation

    Departments of Molecular and Cellular Physiology, Neurology and Neurological Sciences and Stanford Synchrotron Radiation Laboratory, The Howard Hughes Medical Institute and, Stanford, CA, 94305, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CALMODULIN A148Paramecium tetraureliaMutation(s): 0 
Gene Names: CAMGSPATT00015825001
Find proteins for P07463 (Paramecium tetraurelia)
Explore P07463 
Go to UniProtKB:  P07463
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.00 Å
  • R-Value Free: 0.163 
  • R-Value Observed: 0.134 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 25.015α = 89.54
b = 29.415β = 86.1
c = 52.761γ = 82.39
Software Package:
Software NamePurpose
SHELXL-97refinement
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-09-20
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection, Refinement description