Structure of calmodulin bound to a calcineurin peptide: a new way of making an old binding mode

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.240 

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Structure of calmodulin bound to a calcineurin Peptide: a new way of making an old binding mode.

Ye, Q.Li, X.Wong, A.Wei, Q.Jia, Z.

(2006) Biochemistry 45: 738-745

  • DOI: https://doi.org/10.1021/bi0521801
  • Primary Citation of Related Structures:  
    2F2O, 2F2P

  • PubMed Abstract: 

    Calcineurin is a calmodulin-binding protein in brain and the only serine/threonine protein phosphatase under the control of Ca2+/calmodulin (CaM), which plays a critical role in coupling Ca2+ signals to cellular responses. CaM up-regulates the phosphatase activity of calcineurin by binding to the CaM-binding domain (CBD) of calcineurin subunit A. Here, we report crystal structural studies of CaM bound to a CBD peptide. The chimeric protein containing CaM and the CBD peptide forms an intimate homodimer, in which CaM displays a native-like extended conformation and the CBD peptide shows alpha-helical structure. Unexpectedly, the N-terminal lobe from one CaM and the C-terminal lobe from the second molecule form a combined binding site to trap the peptide. Thus, the dimer provides two binding sites, each of which is reminiscent of the fully collapsed conformation of CaM commonly observed in complex with, for example, the myosin light chain kinase (MLCK) peptide. The interaction between the peptide and CaM is highly specific and similar to MLCK.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Beijing Key Laboratory, Beijing Normal University, Beijing 100875, People's Republic of China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calmodulin fused with calmodulin-binding domain of calcineurin
A, B
179Bos taurusMutation(s): 0 
Gene Names: PPP3CA
Find proteins for P62157 (Bos taurus)
Explore P62157 
Go to UniProtKB:  P62157
Find proteins for P48452 (Bos taurus)
Explore P48452 
Go to UniProtKB:  P48452
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP48452P62157
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.240 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.549α = 90
b = 139.549β = 90
c = 45.592γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-02-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-08-02
    Changes: Refinement description, Source and taxonomy
  • Version 1.4: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description