Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.4 of the entry. See complete history


Study of conformational rearrangement and refinement of structural homology models by the use of heteronuclear dipolar couplings.

Chou, J.J.Li, S.Bax, A.

(2000) J Biomol NMR 18: 217-227

  • DOI: https://doi.org/10.1023/a:1026563923774
  • Primary Citation of Related Structures:  
    1F70, 1F71

  • PubMed Abstract: 

    For an increasing fraction of proteins whose structures are being studied, sequence homology to known structures permits building of low resolution structural models. It is demonstrated that dipolar couplings, measured in a liquid crystalline medium, not only can validate such structural models, but also refine them. Here, experimental 1H-15N, 1Halpha-13Calpha, and 13C'-13Calpha dipolar couplings are shown to decrease the backbone rmsd between various homology models of calmodulin (CaM) and its crystal structure. Starting from a model of the Ca2+-saturated C-terminal domain of CaM, built from the structure of Ca2+-free recoverin on the basis of remote sequence homology, dipolar couplings are used to decrease the rmsd between the model and the crystal structure from 5.0 to 1.25 A. A better starting model, built from the crystal structure of Ca2+-saturated parvalbumin, decreases in rmsd from 1.25 to 0.93 A. Similarly, starting from the structure of the Ca2+-ligated CaM N-terminal domain, experimental dipolar couplings measured for the Ca2+-free form decrease the backbone rmsd relative to the refined solution structure of apo-CaM from 4.2 to 1.0 A.

  • Organizational Affiliation

    Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CALMODULIN76Xenopus laevisMutation(s): 0 
Find proteins for P0DP33 (Xenopus laevis)
Explore P0DP33 
Go to UniProtKB:  P0DP33
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Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DP33
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-09-22
    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: 2022-02-16
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-22
    Changes: Data collection