Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 20.51 kDa 
• Atom Count: 1431 
• Residue Count: 169 
• Unique protein chains: 2

2BCX

Crystal structure of calmodulin in complex with a ryanodine receptor peptide

• DOI: 10.2210/pdb2BCX/pdb

• Classification: CALCIUM BINDING PROTEIN
• Organism(s): Gallus gallus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2005-10-19 Released: 2006-10-31 
• Deposition Author(s): Maximciuc, A.A., Shamoo, Y., MacKenzie, K.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.249 
• R-Value Work: 0.213 
• R-Value Observed: 0.214 

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

• PubMed: 17027503 
• DOI: 10.1016/j.str.2006.08.011
• Primary Citation of Related Structures:  
  2BCX


• 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 "1-17" 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calmodulin	A	148	Gallus gallus	Mutation(s): 0  Gene Names: CALM, CAM, RCJMB04_24e7
Find proteins for P62149 (Gallus gallus) Explore P62149  Go to UniProtKB:  P62149

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Ryanodine receptor 1	B	30	N/A	Mutation(s): 0
Find proteins for P11716 (Oryctolagus cuniculus) Explore P11716  Go to UniProtKB:  P11716

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.249 
• R-Value Work: 0.213 
• R-Value Observed: 0.214 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 38.1	α = 90
b = 44.1	β = 90
c = 90.3	γ = 90

Software Package:

Software Name	Purpose
d*TREK	data scaling
SHARP	phasing
SOLOMON	phasing
CNS	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-10-19 
• Released Date: 2006-10-31 
Deposition Author(s): Maximciuc, A.A., Shamoo, Y., MacKenzie, K.R.

Revision History 

• Version 1.0: 2006-10-31
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-18
  Changes: Refinement description