4Q5U

Structure of calmodulin bound to its recognition site from calcineurin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Stoichiometry of the calcineurin regulatory domain-calmodulin complex.

Dunlap, T.B.Guo, H.F.Cook, E.C.Holbrook, E.Rumi-Masante, J.Lester, T.E.Colbert, C.L.Vander Kooi, C.W.Creamer, T.P.

(2014) Biochemistry 53: 5779-5790

  • DOI: 10.1021/bi5004734
  • Primary Citation of Related Structures:  
    4Q5U

  • PubMed Abstract: 
  • Calcineurin is an essential serine/threonine phosphatase that plays vital roles in neuronal development and function, heart growth, and immune system activation. Calcineurin is unique in that it is the only phosphatase known to be activated by calmodulin ...

    Calcineurin is an essential serine/threonine phosphatase that plays vital roles in neuronal development and function, heart growth, and immune system activation. Calcineurin is unique in that it is the only phosphatase known to be activated by calmodulin in response to increasing intracellular calcium concentrations. Calcium-loaded calmodulin binds to the regulatory domain of calcineurin, resulting in a conformational change that removes an autoinhibitory domain from the active site of the phosphatase. We have determined a 1.95 Å crystal structure of calmodulin bound to a peptide corresponding to its binding region from calcineurin. In contrast to previous structures of this complex, our structure has a stoichiometry of 1:1 and has the canonical collapsed, wraparound conformation observed for many calmodulin-substrate complexes. In addition, we have used size-exclusion chromatography and time-resolved fluorescence to probe the stoichiometry of binding of calmodulin to a construct corresponding to almost the entire regulatory domain from calcineurin, again finding a 1:1 complex. Taken in sum, our data strongly suggest that a single calmodulin protein is necessary and sufficient to bind to and activate each calcineurin enzyme.


    Organizational Affiliation

    Center for Structural Biology, Department of Molecular and Cellular Biochemistry, University of Kentucky , 741 South Limestone Street, Lexington, Kentucky 40536-0509, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin A149Homo sapiensMutation(s): 0 
Gene Names: 
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3...
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3CAMCCAMIII

Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
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PHAROS:  P0DP23
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 2B catalytic subunit alpha isoform C24Homo sapiensMutation(s): 0 
Gene Names: PPP3CACALNACNA
EC: 3.1.3.16
Find proteins for Q08209 (Homo sapiens)
Explore Q08209 
Go to UniProtKB:  Q08209
NIH Common Fund Data Resources
PHAROS:  Q08209
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.499α = 90
b = 111.033β = 90
c = 39.448γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-03
    Type: Initial release
  • Version 1.1: 2014-10-01
    Changes: Database references