3CLN

STRUCTURE OF CALMODULIN REFINED AT 2.2 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of calmodulin refined at 2.2 A resolution.

Babu, Y.S.Bugg, C.E.Cook, W.J.

(1988) J.Mol.Biol. 204: 191-204


  • PubMed Abstract: 
  • The crystal structure of mammalian calmodulin has been refined at 2.2 A (1 A = 0.1 nm) resolution using a restrained least-squares method. The final crystallographic R-factor, based on 6685 reflections in the range 2.2 A less than or equal to d less ...

    The crystal structure of mammalian calmodulin has been refined at 2.2 A (1 A = 0.1 nm) resolution using a restrained least-squares method. The final crystallographic R-factor, based on 6685 reflections in the range 2.2 A less than or equal to d less than or equal to 5.0 A with intensities exceeding 2.5 sigma, is 0.175. Bond lengths and bond angles in the molecule have root-mean-square deviations from ideal values of 0.016 A and 1.7 degrees, respectively. The refined model includes residues 5 to 147, four Ca2+ and 69 water molecules per molecule of calmodulin. The electron density for residues 1 to 4 and 148 is poorly defined, and they are not included in the model. The molecule is shaped somewhat like a dumbbell, with an overall length of 65 A; the two lobes are connected by a seven-turn alpha-helix. Prominent secondary structural features include seven alpha-helices, four Ca2+-binding loops, and two short, double-stranded antiparallel beta-sheets between pairs of adjacent Ca2+-binding loops. The four Ca2+-binding domains in calmodulin have a typical EF hand conformation (helix-loop-helix) and are similar to those described in other Ca2+-binding proteins. The X-ray structure determination of calmodulin shows a large hydrophobic cleft in each half of the molecule. These hydrophobic regions probably represent the sites of interaction with many of the pharmacological agents known to bind to calmodulin.


    Related Citations: 
    • Chicken Calmodulin Genes. A Species Comparison of C/DNA Sequences and Isolation of a Genomic Clone
      Putkey, J.A.,Ts'Ui, K.F.,Tanaka, T.,Lagace, L.,Stein, J.P.,Lai, E.C.,Means, A.R.
      (1983) J.Biol.Chem. 258: 11864
    • Three-Dimensional Structure of Calmodulin
      Babu, Y.S.,Sack, J.S.,Greenhough, T.J.,Bugg, C.E.,Means, A.R.,Cook, W.J.
      (1985) Nature 315: 37
    • Preparation of Calmodulin Crystals
      Cook, W.J.,Sack, J.S.
      (1983) Methods Enzymol. 102: 143
    • Crystallization and Preliminary X-Ray Investigation of Calmodulin
      Cook, W.J.,Dedman, J.R.,Means, A.R.,Bugg, C.E.
      (1980) J.Biol.Chem. 255: 8152


    Organizational Affiliation

    Department of Pathology, University of Alabama, Birmingham 35294.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CALMODULIN
A
148Rattus norvegicusMutation(s): 0 
Gene Names: Calm2 (Cam2, Camb, CaMII)
Find proteins for P0DP30 (Rattus norvegicus)
Go to UniProtKB:  P0DP30
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 29.710α = 94.13
b = 53.790β = 97.57
c = 24.990γ = 89.46
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1988-07-16
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other