Myelin-associated glycoprotein (MAG) deglycosylated full extracellular domain with co-purified ligand

Experimental Data Snapshot

  • Resolution: 3.80 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

Starting Models: experimental
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Structural basis of myelin-associated glycoprotein adhesion and signalling.

Pronker, M.F.Lemstra, S.Snijder, J.Heck, A.J.Thies-Weesie, D.M.Pasterkamp, R.J.Janssen, B.J.

(2016) Nat Commun 7: 13584-13584

  • DOI: https://doi.org/10.1038/ncomms13584
  • Primary Citation of Related Structures:  
    5LF5, 5LFR, 5LFU, 5LFV

  • PubMed Abstract: 

    Myelin-associated glycoprotein (MAG) is a myelin-expressed cell-adhesion and bi-directional signalling molecule. MAG maintains the myelin-axon spacing by interacting with specific neuronal glycolipids (gangliosides), inhibits axon regeneration and controls myelin formation. The mechanisms underlying MAG adhesion and signalling are unresolved. We present crystal structures of the MAG full ectodomain, which reveal an extended conformation of five Ig domains and a homodimeric arrangement involving membrane-proximal domains Ig4 and Ig5. MAG-oligosaccharide complex structures and biophysical assays show how MAG engages axonal gangliosides at domain Ig1. Two post-translational modifications were identified-N-linked glycosylation at the dimerization interface and tryptophan C-mannosylation proximal to the ganglioside binding site-that appear to have regulatory functions. Structure-guided mutations and neurite outgrowth assays demonstrate MAG dimerization and carbohydrate recognition are essential for its regeneration-inhibiting properties. The combination of trans ganglioside binding and cis homodimerization explains how MAG maintains the myelin-axon spacing and provides a mechanism for MAG-mediated bi-directional signalling.

  • Organizational Affiliation

    Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myelin-associated glycoprotein500Mus musculusMutation(s): 0 
Gene Names: Mag
UniProt & NIH Common Fund Data Resources
Find proteins for P20917 (Mus musculus)
Explore P20917 
Go to UniProtKB:  P20917
IMPC:  MGI:96912
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20917
Glycosylation Sites: 6Go to GlyGen: P20917-1
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G86851RC
GlyCosmos:  G86851RC
GlyGen:  G86851RC
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-galactopyranose
Glycosylation Resources
GlyTouCan:  G02684WR
GlyCosmos:  G02684WR
GlyGen:  G02684WR
Experimental Data & Validation

Experimental Data

  • Resolution: 3.80 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 278.868α = 90
b = 278.868β = 90
c = 62.52γ = 120
Software Package:
Software NamePurpose
iMOSFLMdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Netherlands Organisation for Scientific ResearchNetherlands723.012.002

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-14
    Type: Initial release
  • Version 1.1: 2017-09-13
    Changes: Author supporting evidence
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary