5N4Q

Human myelin protein P2, mutant T51P


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Molecular mechanisms of Charcot-Marie-Tooth neuropathy linked to mutations in human myelin protein P2.

Ruskamo, S.Nieminen, T.Kristiansen, C.K.Vatne, G.H.Baumann, A.Hallin, E.I.Raasakka, A.Joensuu, P.Bergmann, U.Vattulainen, I.Kursula, P.

(2017) Sci Rep 7: 6510-6510

  • DOI: https://doi.org/10.1038/s41598-017-06781-0
  • Primary Citation of Related Structures:  
    5N4M, 5N4P, 5N4Q

  • PubMed Abstract: 

    Charcot-Marie-Tooth (CMT) disease is one of the most common inherited neuropathies. Recently, three CMT1-associated point mutations (I43N, T51P, and I52T) were discovered in the abundant peripheral myelin protein P2. These mutations trigger abnormal myelin structure, leading to reduced nerve conduction velocity, muscle weakness, and distal limb atrophy. P2 is a myelin-specific protein expressed by Schwann cells that binds to fatty acids and membranes, contributing to peripheral myelin lipid homeostasis. We studied the molecular basis of the P2 patient mutations. None of the CMT1-associated mutations alter the overall folding of P2 in the crystal state. P2 disease variants show increased aggregation tendency and remarkably reduced stability, T51P being most severe. In addition, P2 disease mutations affect protein dynamics. Both fatty acid binding by P2 and the kinetics of its membrane interactions are affected by the mutations. Experiments and simulations suggest opening of the β barrel in T51P, possibly representing a general mechanism in fatty acid-binding proteins. Our findings demonstrate that altered biophysical properties and functional dynamics of P2 may cause myelin defects in CMT1 patients. At the molecular level, a few malformed hydrogen bonds lead to structural instability and misregulation of conformational changes related to ligand exchange and membrane binding.


  • Organizational Affiliation

    Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220, Oulu, Finland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myelin P2 protein133Homo sapiensMutation(s): 1 
Gene Names: PMP2
UniProt & NIH Common Fund Data Resources
Find proteins for P02689 (Homo sapiens)
Explore P02689 
Go to UniProtKB:  P02689
PHAROS:  P02689
GTEx:  ENSG00000147588 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02689
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.024α = 90
b = 66.024β = 90
c = 100.859γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-08-09
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Refinement description