3BXK

Crystal structure of the P/Q-type calcium channel (CaV2.1) IQ domain and CA2+calmodulin complex

• PDB DOI: https://doi.org/10.2210/pdb3BXK/pdb

• Classification: MEMBRANE PROTEIN, SIGNALING PROTEIN
• Organism(s): Rattus norvegicus, Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-01-14 Released: 2008-03-25 
• Deposition Author(s): Mori, M.X., Vander Kooi, C.W., Leahy, D.J., Yue, D.T.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.267 
• R-Value Work: 0.213 
• R-Value Observed: 0.216 

Literature

Crystal structure of the P/Q-type calcium channel (CaV2.1) IQ domain and CA2+calmodulin complex

Mori, M.X., Vander Kooi, C.W., Leahy, D.J., Yue, D.T.

To be published.

Biological Assembly 1  

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

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

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 39.25 kDa 
• Atom Count: 2,601 
• Modelled Residue Count: 315 
• Deposited Residue Count: 338 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calmodulin	A, C	148	Rattus norvegicus	Mutation(s): 0  Gene Names: Calm1, Calm, Cam, Cam1
UniProt
Find proteins for P0DP29 (Rattus norvegicus) Explore P0DP29  Go to UniProtKB:  P0DP29

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Voltage-dependent P/Q-type calcium channel subunit alpha-1A peptide	B, D	21	N/A	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for O00555 (Homo sapiens) Explore O00555  Go to UniProtKB:  O00555
PHAROS:  O00555 GTEx:  ENSG00000141837

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	I [auth A], N [auth C], O [auth C]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CA	E [auth A], F [auth A], G [auth A], H [auth A], J [auth C], K [auth C], L [auth C], M [auth C]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.267 
• R-Value Work: 0.213 
• R-Value Observed: 0.216 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 80.655	α = 90
b = 80.431	β = 97.56
c = 63.837	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-03-25 
Deposition Author(s): Mori, M.X., Vander Kooi, C.W., Leahy, D.J., Yue, D.T.

Revision History  

• Version 1.0: 2008-03-25
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2024-02-21
  Changes: Data collection, Database references, Derived calculations