Crystal structure of bovine brain Ca++ calmodulin in a compact form

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 

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This is version 1.2 of the entry. See complete history


A closed compact structure of native ca(2+)-calmodulin.

Fallon, J.L.Quiocho, F.A.

(2003) Structure 11: 1303-1307

  • DOI: https://doi.org/10.1016/j.str.2003.09.004
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Calmodulin has been a subject of intense scrutiny since its discovery because of its unusual properties in regulating the functions of about 100 diverse target enzymes and structural proteins. The original and to date only crystal conformation of native eukaryotic Ca(2+)-calmodulin (Ca(2+)-CaM) is a very extended molecule with two widely separated globular domains linked by an exposed long helix. Here we report the 1.7 A X-ray structure of a new native Ca(2+)-CaM that is in a compact ellipsoidal conformation and shows a sharp bend in the linker helix and a more contracted N-terminal domain. This conformation may offer advantages for recognition of kinase-type calmodulin targets or small organic molecule drugs.

  • Organizational Affiliation

    Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calmodulin149Bos taurusMutation(s): 1 
Gene Names: CALMCAM
Find proteins for P62157 (Bos taurus)
Explore P62157 
Go to UniProtKB:  P62157
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP62157
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.32α = 90
b = 35.75β = 117.19
c = 68.03γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-10-10
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance