Solution structure and dynamics of S100A5 in the Ca2+ -bound states

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 350 
  • Conformers Submitted: 31 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Solution structure and dynamics of S100A5 in the apo and Ca2+-bound states

Bertini, I.Das Gupta, S.Hu, X.Karavelas, T.Luchinat, C.Parigi, G.Yuan, J.

(2009) J Biol Inorg Chem 14: 1097-1107

  • DOI: https://doi.org/10.1007/s00775-009-0553-1
  • Primary Citation of Related Structures:  
    2KAX, 2KAY

  • PubMed Abstract: 

    S100A5 is a calcium binding protein of the S100 family, with one canonical and one S100-specific EF-hand motif per subunit. Although its function is still unknown, it has recently been reported to be one of the S100 proteins able to interact with the receptor for advanced glycation end products. The homodimeric solution structures of S100A5 in both the apo and the calcium(II)-loaded forms have been obtained, and show a conformational rearrangement upon calcium binding. This rearrangement involves, in particular, the hinge loop connecting the N-terminal and the C-terminal EF-hand domains, the reorientation of helix III with respect to helix IV, as common to several S100 proteins, and the elongation of helix IV. The details of the structural changes are important because they must be related to the different functions, still largely unknown, of the different members of the S100 family. For the first time for a full-length S100 protein, relaxation measurements were performed on both the apo and the calcium-bound forms. A quite large mobility was observed in the hinge loop, which is not quenched in the calcium form. The structural differences resulting upon calcium binding change the global shape and the distribution of hydrophobic and charged residues of the S100A5 homodimer in a modest but significantly different manner with respect to the closest homologues S100A4 and S100A6.

  • Organizational Affiliation

    Magnetic Resonance Center (CERM), University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Italy. ivanobertini@cerm.unifi.it

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein S100-A5
A, B
92Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P33763 (Homo sapiens)
Explore P33763 
Go to UniProtKB:  P33763
PHAROS:  P33763
GTEx:  ENSG00000196420 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33763
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 350 
  • Conformers Submitted: 31 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-02-26
    Changes: Data collection, Database references, Derived calculations, Other, Structure summary
  • Version 1.3: 2020-09-16
    Changes: Derived calculations, Structure summary