5GGP

Crystal structure of N-terminal domain of human protein O-mannose beta-1,2-N-acetylglucosaminyltransferase in complex with GlcNAc-beta1,2-Man-peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.599 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.216 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Carbohydrate-binding domain of the POMGnT1 stem region modulates O-mannosylation sites of alpha-dystroglycan

Kuwabara, N.Manya, H.Yamada, T.Tateno, H.Kanagawa, M.Kobayashi, K.Akasaka-Manya, K.Hirose, Y.Mizuno, M.Ikeguchi, M.Toda, T.Hirabayashi, J.Senda, T.Endo, T.Kato, R.

(2016) Proc.Natl.Acad.Sci.USA 113: 9280-9285

  • DOI: 10.1073/pnas.1525545113
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The dystrophin glycoprotein complex, which connects the cell membrane to the basement membrane, is essential for a variety of biological events, including maintenance of muscle integrity. An O-mannose-type GalNAc-β1,3-GlcNAc-β1,4-(phosphate-6)-Man st ...

    The dystrophin glycoprotein complex, which connects the cell membrane to the basement membrane, is essential for a variety of biological events, including maintenance of muscle integrity. An O-mannose-type GalNAc-β1,3-GlcNAc-β1,4-(phosphate-6)-Man structure of α-dystroglycan (α-DG), a subunit of the complex that is anchored to the cell membrane, interacts directly with laminin in the basement membrane. Reduced glycosylation of α-DG is linked to some types of inherited muscular dystrophy; consistent with this relationship, many disease-related mutations have been detected in genes involved in O-mannosyl glycan synthesis. Defects in protein O-linked mannose β1,2-N-acetylglucosaminyltransferase 1 (POMGnT1), a glycosyltransferase that participates in the formation of GlcNAc-β1,2-Man glycan, are causally related to muscle-eye-brain disease (MEB), a congenital muscular dystrophy, although the role of POMGnT1 in postphosphoryl modification of GalNAc-β1,3-GlcNAc-β1,4-(phosphate-6)-Man glycan remains elusive. Our crystal structures of POMGnT1 agreed with our previous results showing that the catalytic domain recognizes substrate O-mannosylated proteins via hydrophobic interactions with little sequence specificity. Unexpectedly, we found that the stem domain recognizes the β-linked GlcNAc of O-mannosyl glycan, an enzymatic product of POMGnT1. This interaction may recruit POMGnT1 to a specific site of α-DG to promote GlcNAc-β1,2-Man clustering and also may recruit other enzymes that interact with POMGnT1, e.g., fukutin, which is required for further modification of the GalNAc-β1,3-GlcNAc-β1,4-(phosphate-6)-Man glycan. On the basis of our findings, we propose a mechanism for the deficiency in postphosphoryl modification of the glycan observed in POMGnT1-KO mice and MEB patients.


    Organizational Affiliation

    Photon Factory, Structural Biology Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein O-linked-mannose beta-1,2-N-acetylglucosaminyltransferase 1
A, B
164Homo sapiensMutation(s): 0 
Gene Names: POMGNT1 (MGAT1.2)
EC: 2.4.1.-
Find proteins for Q8WZA1 (Homo sapiens)
Go to Gene View: POMGNT1
Go to UniProtKB:  Q8WZA1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
10-mer Peptide from Dystroglycan
C, D
10Homo sapiensMutation(s): 0 
Gene Names: DAG1
Find proteins for Q14118 (Homo sapiens)
Go to Gene View: DAG1
Go to UniProtKB:  Q14118
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
MAN
Query on MAN

Download SDF File 
Download CCD File 
C, D
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
C, D
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.599 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.216 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 111.113α = 90.00
b = 49.743β = 105.89
c = 61.716γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-10
    Type: Initial release
  • Version 1.1: 2016-08-31
    Type: Database references