1PRW

Crystal structure of bovine brain Ca++ calmodulin in a compact form

• PDB DOI:  https://doi.org/10.2210/pdb1PRW/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Bos taurus
• Mutation(s): Yes 


• Deposited: 2003-06-20 Released: 2003-10-10 
• Deposition Author(s): Fallon, J.L., Quiocho, F.A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.230 
• R-Value Work: 0.186 
• R-Value Observed: 0.186 

Literature

A closed compact structure of native ca(2+)-calmodulin.

Fallon, J.L., Quiocho, F.A.

(2003) Structure 11: 1303-1307

• PubMed: 14527397 
• DOI: https://doi.org/10.1016/j.str.2003.09.004
• Primary Citation of Related Structures:  
  1PRW


• PubMed Abstract: 
  

  Calmodulin has been a subject of intense scrutiny since its discovery because of its unusual properties in regulating the functions of about 100 diverse target enzymes and structural proteins. The original and to date only crystal conformation of native eukaryotic Ca(2+)-calmodulin (Ca(2+)-CaM) is a very extended molecule with two widely separated globular domains linked by an exposed long helix. Here we report the 1.7 A X-ray structure of a new native Ca(2+)-CaM that is in a compact ellipsoidal conformation and shows a sharp bend in the linker helix and a more contracted N-terminal domain. This conformation may offer advantages for recognition of kinase-type calmodulin targets or small organic molecule drugs.

---

Organizational Affiliation: 

Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 16.95 kDa 
• Atom Count: 1,348 
• Modelled Residue Count: 149 
• Deposited Residue Count: 149 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calmodulin	A	149	Bos taurus	Mutation(s): 1  Gene Names: CALM, CAM
UniProt
Find proteins for P62157 (Bos taurus) Explore P62157  Go to UniProtKB:  P62157

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	B [auth A], C [auth A], D [auth A], E [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
M3L	A	L-PEPTIDE LINKING	C9 H21 N2 O2		LYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.230 
• R-Value Work: 0.186 
• R-Value Observed: 0.186 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.32	α = 90
b = 35.75	β = 117.19
c = 68.03	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
PHASES	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-10-10 
Deposition Author(s): Fallon, J.L., Quiocho, F.A.

Revision History  

• Version 1.0: 2003-10-10
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance