1QU0

CRYSTAL STRUCTURE OF THE FIFTH LAMININ G-LIKE MODULE OF THE MOUSE LAMININ ALPHA2 CHAIN

• PDB DOI: https://doi.org/10.2210/pdb1QU0/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Mus musculus
• Mutation(s): No 


• Deposited: 1999-07-05 Released: 1999-12-03 
• Deposition Author(s): Hohenester, E., Tisi, D., Talts, J.F., Timpl, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.255 
• R-Value Work: 0.229 

Literature

The crystal structure of a laminin G-like module reveals the molecular basis of alpha-dystroglycan binding to laminins, perlecan, and agrin.

Hohenester, E., Tisi, D., Talts, J.F., Timpl, R.

(1999) Mol Cell 4: 783-792

• PubMed: 10619025 
• DOI: https://doi.org/10.1016/s1097-2765(00)80388-3
• Primary Citation of Related Structures:  
  1QU0


• PubMed Abstract: 
  

  Laminin G-like (LG) modules in the extracellular matrix glycoproteins laminin, perlecan, and agrin mediate the binding to heparin and the cell surface receptor alpha-dystroglycan (alpha-DG). These interactions are crucial to basement membrane assembly, as well as muscle and nerve cell function. The crystal structure of the laminin alpha 2 chain LG5 module reveals a 14-stranded beta sandwich. A calcium ion is bound to one edge of the sandwich by conserved acidic residues and is surrounded by residues implicated in heparin and alpha-DG binding. A calcium-coordinated sulfate ion is suggested to mimic the binding of anionic oligosaccharides. The structure demonstrates a conserved function of the LG module in calcium-dependent lectin-like alpha-DG binding.

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Organizational Affiliation: 

Biophysics Section, Blackett Laboratory, Imperial College, London, United Kingdom. [e-mail]

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 3 assigned by authors.

Biological Assembly 4  

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

Biological assembly 4 assigned by authors.

Macromolecule Content

• Total Structure Weight: 82.51 kDa 
• Atom Count: 5,794 
• Modelled Residue Count: 726 
• Deposited Residue Count: 764 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
LAMININ ALPHA2 CHAIN	A, B, C, D	191	Mus musculus	Mutation(s): 0
UniProt
Find proteins for Q60675 (Mus musculus) Explore Q60675  Go to UniProtKB:  Q60675

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.255 
• R-Value Work: 0.229 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.22	α = 90
b = 112.89	β = 92
c = 117.4	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
MLPHARE	phasing
X-PLOR	refinement
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-12-03 
Deposition Author(s): Hohenester, E., Tisi, D., Talts, J.F., Timpl, R.

Revision History  

• Version 1.0: 1999-12-03
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-11-13
  Changes: Data collection, Database references, Derived calculations, Structure summary