1JWD

Ca2+-induced Structural Changes in Calcyclin: High-resolution Solution Structure of Ca2+-bound Calcyclin.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 22 
  • Selection Criteria: The program Findfam was used to establish that the number of structures required to accurately represent the ensemble was less than 22 (the number selected to represent previous S100A6 ensembles). Structures were ordered by lowest restraint violations, then accepted if total molecular energy and each contributing term was within two standard deviations of the mean. The 22 structures with least restraint violations (energy penalty and magnitude of largest violation) all met these criteria. 

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This is version 1.2 of the entry. See complete history

Literature

A structural basis for S100 protein specificity derived from comparative analysis of apo and Ca(2+)-calcyclin

Maler, L.Sastry, M.Chazin, W.J.

(2002) J.Mol.Biol. 317: 279-290

  • DOI: 10.1006/jmbi.2002.5421

  • PubMed Abstract: 
  • Calcyclin is a homodimeric protein belonging to the S100 subfamily of EF-hand Ca(2+)-binding proteins, which function in Ca(2+) signal transduction processes. A refined high-resolution solution structure of Ca(2+)-bound rabbit calcyclin has been dete ...

    Calcyclin is a homodimeric protein belonging to the S100 subfamily of EF-hand Ca(2+)-binding proteins, which function in Ca(2+) signal transduction processes. A refined high-resolution solution structure of Ca(2+)-bound rabbit calcyclin has been determined by heteronuclear solution NMR. In order to understand the Ca(2+)-induced structural changes in S100 proteins, in-depth comparative structural analyses were used to compare the apo and Ca(2+)-bound states of calcyclin, the closely related S100B, and the prototypical Ca(2+)-sensor protein calmodulin. Upon Ca(2+) binding, the position and orientation of helix III in the second EF-hand is altered, whereas the rest of the protein, including the dimer interface, remains virtually unchanged. This Ca(2+)-induced structural change is much less drastic than the "opening" of the globular EF-hand domains that occurs in classical Ca(2+) sensors, such as calmodulin. Using homology models of calcyclin based on S100B, a binding site in calcyclin has been proposed for the N-terminal domain of annexin XI and the C-terminal domain of the neuronal calcyclin-binding protein. The structural basis for the specificity of S100 proteins is discussed in terms of the variation in sequence of critical contact residues in the common S100 target-binding site.


    Related Citations: 
    • The Three-dimenisonal Structure of Ca(2+)-bound Calcyclin: Implications for Ca(2+)-signal Transduction by S100 Proteins.
      Sastry, M.,Ketchem, R.R.,Crescenzi, O.,Weber, C.,Lubienski, M.J.,Hidaka, H.,Chazin, W.J.
      (1998) Structure 6: 223
    • High Resolution Solution Structure of Apo Calcyclin and Structural Variations in the S100 Family of Calcium-binding Proteins.
      Maler, L.,Potts, B.C.M.,Chazin, W.J.
      (1999) J.Biomol.NMR 13: 233
    • The Structure of Calcyclin Reveals a Novel Homodimeric Fold for S100 Ca(2+)-binding Proteins.
      Potts, B.C.,Smith, J.,Akke, M.,Macke, T.J.,Okazaki, K.,Hidaka, H.,Chase, D.A.,Chazin, W.J.
      (1995) Nat.Struct.Mol.Biol. 2: 790


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Arrhenius Laboratory, Stockholm University, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calcyclin
A, B
90Oryctolagus cuniculusMutation(s): 0 
Gene Names: S100A6
Find proteins for P30801 (Oryctolagus cuniculus)
Go to Gene View: S100A6
Go to UniProtKB:  P30801
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 22 
  • Selection Criteria: The program Findfam was used to establish that the number of structures required to accurately represent the ensemble was less than 22 (the number selected to represent previous S100A6 ensembles). Structures were ordered by lowest restraint violations, then accepted if total molecular energy and each contributing term was within two standard deviations of the mean. The 22 structures with least restraint violations (energy penalty and magnitude of largest violation) all met these criteria. 
  • Olderado: 1JWD Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-03-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance