2BCX

Crystal structure of calmodulin in complex with a ryanodine receptor peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Complex of calmodulin with a ryanodine receptor target reveals a novel, flexible binding mode.

Maximciuc, A.A.Putkey, J.A.Shamoo, Y.Mackenzie, K.R.

(2006) Structure 14: 1547-1556

  • DOI: 10.1016/j.str.2006.08.011

  • PubMed Abstract: 
  • Calmodulin regulates ryanodine receptor-mediated Ca(2+) release through a conserved binding site. The crystal structure of Ca(2+)-calmodulin bound to this conserved site reveals that calmodulin recognizes two hydrophobic anchor residues at a novel "1 ...

    Calmodulin regulates ryanodine receptor-mediated Ca(2+) release through a conserved binding site. The crystal structure of Ca(2+)-calmodulin bound to this conserved site reveals that calmodulin recognizes two hydrophobic anchor residues at a novel "1-17" spacing that brings the calmodulin lobes close together but prevents them from contacting one another. NMR residual dipolar couplings demonstrate that the detailed structure of each lobe is preserved in solution but also show that the lobes experience domain motions within the complex. FRET measurements confirm the close approach of the lobes in binding the 1-17 target and show that calmodulin binds with one lobe to a peptide lacking the second anchor. We suggest that calmodulin regulates the Ca(2+) channel by switching between the contiguous binding mode seen in our crystal structure and a state where one lobe of calmodulin contacts the conserved binding site while the other interacts with a noncontiguous site on the channel.


    Organizational Affiliation

    Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calmodulin
A
148Gallus gallusMutation(s): 0 
Gene Names: CALM (CAM)
Find proteins for P62149 (Gallus gallus)
Go to UniProtKB:  P62149
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ryanodine receptor 1
B
30Oryctolagus cuniculusMutation(s): 0 
Gene Names: RYR1
Find proteins for P11716 (Oryctolagus cuniculus)
Go to Gene View: RYR1
Go to UniProtKB:  P11716
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 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 38.100α = 90.00
b = 44.100β = 90.00
c = 90.300γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata scaling
SHARPphasing
CNSrefinement
PDB_EXTRACTdata extraction
SOLOMONphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-10-31
    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: 2017-10-18
    Type: Refinement description