4HEX

A novel conformation of calmodulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 

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This is version 1.1 of the entry. See complete history


Literature

A novel trans conformation of ligand-free calmodulin

Kumar, V.Chichili, V.P.R.Tang, X.Sivaraman, J.

(2013) PLoS One 8: e54834-e54834

  • DOI: 10.1371/journal.pone.0054834
  • Primary Citation of Related Structures:  
    4HEX

  • PubMed Abstract: 
  • Calmodulin (CaM) is a highly conserved eukaryotic protein that binds specifically to more than 100 target proteins in response to calcium (Ca(2+)) signal. CaM adopts a considerable degree of structural plasticity to accomplish this physiological role; ho ...

    Calmodulin (CaM) is a highly conserved eukaryotic protein that binds specifically to more than 100 target proteins in response to calcium (Ca(2+)) signal. CaM adopts a considerable degree of structural plasticity to accomplish this physiological role; however, the nature and extent of this plasticity remain to be fully understood. Here, we report the crystal structure of a novel trans conformation of ligand-free CaM where the relative disposition of two lobes of CaM is different, a conformation to-date not reported. While no major structural changes were observed in the independent N- and C-lobes as compared with previously reported structures of Ca(2+)/CaM, the central helix was tilted by ~90° at Arg75. This is the first crystal structure of CaM to show a drastic conformational change in the central helix, and reveals one of several possible conformations of CaM to engage with its binding partner.


    Organizational Affiliation

    Department of Biological Sciences, National University of Singapore, Republic of Singapore, Republic of Singapore.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin AB156Mus musculusMutation(s): 0 
Gene Names: CamCalm1CalmCam1
Find proteins for P0DP26 (Mus musculus)
Explore P0DP26 
Go to UniProtKB:  P0DP26
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.827α = 90
b = 116.397β = 94.83
c = 38.797γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SHELXCDphasing
SHELXEmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-06
    Type: Initial release
  • Version 1.1: 2017-11-15
    Changes: Refinement description