4DUQ

The Structure of Ca2+-loaded S100A2 at 1.3A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.136 
  • R-Value Observed: 0.138 

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This is version 1.2 of the entry. See complete history


Literature

The structure of Ca2+-loaded S100A2 at 1.3- angstrom resolution.

Koch, M.Fritz, G.

(2012) FEBS J 279: 1799-1810

  • DOI: 10.1111/j.1742-4658.2012.08556.x
  • Primary Citation of Related Structures:  
    4DUQ

  • PubMed Abstract: 
  • S100A2 is an EF-hand calcium ion (Ca(2+))-binding protein that activates the tumour suppressor p53. In order to understand the molecular mechanisms underlying the Ca(2+) -induced activation of S100A2, the structure of Ca(2+)-bound S100A2 was determined at 1 ...

    S100A2 is an EF-hand calcium ion (Ca(2+))-binding protein that activates the tumour suppressor p53. In order to understand the molecular mechanisms underlying the Ca(2+) -induced activation of S100A2, the structure of Ca(2+)-bound S100A2 was determined at 1.3 Å resolution by X-ray crystallography. The structure was compared with Ca(2+) -free S100A2 and with other S100 proteins. Binding of Ca(2+) to S100A2 induces small structural changes in the N-terminal EF-hand, but a large conformational change in the C-terminal EF-hand, reorienting helix III by approximately 90°. This movement is accompanied by the exposure of a hydrophobic cavity between helix III and helix IV that represents the target protein interaction site. This molecular reorganization is associated with the breaking and new formation of intramolecular hydrophobic contacts. The target binding site exhibits unique features; in particular, the hydrophobic cavity is larger than in other Ca(2+)-loaded S100 proteins. The structural data underline that the shape and size of the hydrophobic cavity are major determinants for target specificity of S100 proteins and suggest that the binding mode for S100A2 is different from that of other p53-interacting S100 proteins. Database Structural data are available in the Protein Data Bank database under the accession number 4DUQ


    Organizational Affiliation

    Bayer Schering Pharma AG, Wuppertal, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein S100-A2 AB98Homo sapiensMutation(s): 3 
Gene Names: S100A2S100L
Find proteins for P29034 (Homo sapiens)
Explore P29034 
Go to UniProtKB:  P29034
NIH Common Fund Data Resources
PHAROS:  P29034
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.136 
  • R-Value Observed: 0.138 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.67α = 90
b = 84.67β = 90
c = 58.3γ = 120
Software Package:
Software NamePurpose
XSCALEdata scaling
SHELXphasing
REFMACrefinement
PDB_EXTRACTdata extraction
SHELXDphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2012-02-22 
  • Released Date: 2012-03-07 
  • Deposition Author(s): Koch, M., Fritz, G.
  • This entry supersedes: 3N22

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2012-03-28
    Changes: Database references
  • Version 1.2: 2014-03-12
    Changes: Database references