1BHD

SECOND CALPONIN HOMOLOGY DOMAIN FROM UTROPHIN

• PDB DOI: https://doi.org/10.2210/pdb1BHD/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1998-06-05 Released: 1999-01-13 
• Deposition Author(s): Keep, N.H., Winder, S.J., Kendrick-Jones, J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.257 
• R-Value Work: 0.185 
• R-Value Observed: 0.202 

Literature

The 2.0 A structure of the second calponin homology domain from the actin-binding region of the dystrophin homologue utrophin.

Keep, N.H., Norwood, F.L., Moores, C.A., Winder, S.J., Kendrick-Jones, J.

(1999) J Mol Biol 285: 1257-1264

• PubMed: 9887274 
• DOI: https://doi.org/10.1006/jmbi.1998.2406
• Primary Citation of Related Structures:  
  1BHD


• PubMed Abstract: 
  

  Utrophin is a close homologue of dystrophin, the protein defective in Duchenne muscular dystrophy. Like dystrophin, it is composed of three regions: an N-terminal region that binds actin filaments, a large central region with triple coiled-coil repeats, and a C-terminal region that interacts with components in the dystroglycan protein complex at the plasma membrane. The N-terminal actin-binding region consists of two calponin homology domains and is related to the actin-binding domains of a superfamily of proteins including alpha-actinin, spectrin and fimbrin. Here, we present the 2.0 A structure of the second calponin homology domain of utrophin solved by X-ray crystallography, and compare it to the other calponin homology domains previously determined from spectrin and fimbrin.

---

Organizational Affiliation: 

MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 27.36 kDa 
• Atom Count: 1,944 
• Modelled Residue Count: 216 
• Deposited Residue Count: 236 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
UTROPHIN	A, B	118	Homo sapiens	Mutation(s): 0  Gene Names: UTRN, DMDL
UniProt & NIH Common Fund Data Resources
Find proteins for P46939 (Homo sapiens) Explore P46939  Go to UniProtKB:  P46939
PHAROS:  P46939 GTEx:  ENSG00000152818

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.257 
• R-Value Work: 0.185 
• R-Value Observed: 0.202 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.92	α = 90
b = 32.21	β = 116.25
c = 65.36	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-01-13 
Deposition Author(s): Keep, N.H., Winder, S.J., Kendrick-Jones, J.

Revision History  

• Version 1.0: 1999-01-13
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-05-30
  Changes: Data collection, Derived calculations, Experimental preparation
• Version 1.4: 2023-08-02
  Changes: Database references, Refinement description