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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

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: 10.1021/bi0521801
  • Primary Citation of Related Structures:  

  • 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 phosph ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calmodulin fused with calmodulin-binding domain of calcineurin
A, B
179Bos taurusMutation(s): 0 
Gene Names: PPP3CA, CALM (CAM)
EC: 3.1.3.16
Find proteins for P48452 (Bos taurus)
Go to Gene View: PPP3CA
Go to UniProtKB:  P48452
Find proteins for P62157 (Bos taurus)
Go to UniProtKB:  P62157
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.204 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 121.237α = 90.00
b = 42.769β = 110.39
c = 71.150γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2005-11-17 
  • Released Date: 2006-02-21 
  • Deposition Author(s): Ye, Q., Wong, A., Jia, Z.

Revision History 

  • Version 1.0: 2006-02-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-08-02
    Type: Source and taxonomy