4WIQ

The structure of Murine alpha-Dystroglycan T190M mutant N-terminal domain.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.59 Å
  • R-Value Free: 0.163 
  • R-Value Work: 0.146 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The Structure of the T190M Mutant of Murine alpha-Dystroglycan at High Resolution: Insight into the Molecular Basis of a Primary Dystroglycanopathy.

Bozzi, M.Cassetta, A.Covaceuszach, S.Bigotti, M.G.Bannister, S.Hubner, W.Sciandra, F.Lamba, D.Brancaccio, A.

(2015) Plos One 10: e0124277-e0124277

  • DOI: 10.1371/journal.pone.0124277

  • PubMed Abstract: 
  • The severe dystroglycanopathy known as a form of limb-girdle muscular dystrophy (LGMD2P) is an autosomal recessive disease caused by the point mutation T192M in α-dystroglycan. Functional expression analysis in vitro and in vivo indicated that the mu ...

    The severe dystroglycanopathy known as a form of limb-girdle muscular dystrophy (LGMD2P) is an autosomal recessive disease caused by the point mutation T192M in α-dystroglycan. Functional expression analysis in vitro and in vivo indicated that the mutation was responsible for a decrease in posttranslational glycosylation of dystroglycan, eventually interfering with its extracellular-matrix receptor function and laminin binding in skeletal muscle and brain. The X-ray crystal structure of the missense variant T190M of the murine N-terminal domain of α-dystroglycan (50-313) has been determined, and showed an overall topology (Ig-like domain followed by a basket-shaped domain reminiscent of the small subunit ribosomal protein S6) very similar to that of the wild-type structure. The crystallographic analysis revealed a change of the conformation assumed by the highly flexible loop encompassing residues 159-180. Moreover, a solvent shell reorganization around Met190 affects the interaction between the B1-B5 anti-parallel strands forming part of the floor of the basket-shaped domain, with likely repercussions on the folding stability of the protein domain(s) and on the overall molecular flexibility. Chemical denaturation and limited proteolysis experiments point to a decreased stability of the T190M variant with respect to its wild-type counterpart. This mutation may render the entire L-shaped protein architecture less flexible. The overall reduced flexibility and stability may affect the functional properties of α-dystroglycan via negatively influencing its binding behavior to factors needed for dystroglycan maturation, and may lay the molecular basis of the T190M-driven primary dystroglycanopathy.


    Organizational Affiliation

    Istituto di Biochimica e Biochimica Clinica, Università Cattolica del Sacro Cuore, Roma 00168, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Dystroglycan
A
264Mus musculusMutation(s): 2 
Gene Names: Dag1 (Dag-1)
Find proteins for Q62165 (Mus musculus)
Go to UniProtKB:  Q62165
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.59 Å
  • R-Value Free: 0.163 
  • R-Value Work: 0.146 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 71.879α = 90.00
b = 71.879β = 90.00
c = 144.296γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-05-13
    Type: Initial release