2CBJ

Structure of the Clostridium perfringens NagJ family 84 glycoside hydrolase, a homologue of human O-GlcNAcase in complex with PUGNAc

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 

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Literature

Structural insights into the mechanism and inhibition of eukaryotic O-GlcNAc hydrolysis.

Rao, F.V., Dorfmueller, H.C., Villa, F., Allwood, M., Eggleston, I.M., van Aalten, D.M.

(2006) EMBO J 25: 1569-1578

  • DOI: 10.1038/sj.emboj.7601026
  • Primary Citation of Related Structures:  
    2CBI, 2CBJ

  • PubMed Abstract: 

    • O-linked N-acetylglucosamine (O-GlcNAc) modification of specific serines/threonines on intracellular proteins in higher eukaryotes has been shown to directly regulate important processes such as the cell cycle, insulin sensitivity and transcription. The structure, molecular mechanisms of catalysis, protein substrate recognition/specificity of the eukaryotic O-GlcNAc transferase and hydrolase are largely unknown ...

    O-linked N-acetylglucosamine (O-GlcNAc) modification of specific serines/threonines on intracellular proteins in higher eukaryotes has been shown to directly regulate important processes such as the cell cycle, insulin sensitivity and transcription. The structure, molecular mechanisms of catalysis, protein substrate recognition/specificity of the eukaryotic O-GlcNAc transferase and hydrolase are largely unknown. Here we describe the crystal structure, enzymology and in vitro activity on human substrates of Clostridium perfringens NagJ, a close homologue of human O-GlcNAcase (OGA), representing the first family 84 glycoside hydrolase structure. The structure reveals a deep active site pocket highly conserved with the human enzyme, compatible with binding of O-GlcNAcylated peptides. Together with mutagenesis data, the structure supports a variant of the substrate-assisted catalytic mechanism, involving two aspartic acids and an unusually positioned tyrosine. Insights into recognition of substrate come from a complex with the transition state mimic O-(2-acetamido-2-deoxy-D-glucopyranosylidene)amino-N-phenylcarbamate (Ki=5.4 nM). Strikingly, the enzyme is inhibited by the pseudosubstrate peptide Ala-Cys(-S-GlcNAc)-Ala, and has OGA activity against O-GlcNAcylated human proteins, suggesting that the enzyme is a suitable model for further studies into the function of human OGA.

    Organizational Affiliation: 

    Division of Biological Chemistry & Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee, UK.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HYALURONIDASEA, B594Clostridium perfringensMutation(s): 0 
EC: 3.2.1.35 (PDB Primary Data), 3.2.1.169 (UniProt)
UniProt
Find proteins for Q0TR53 (Clostridium perfringens (strain ATCC 13124 / DSM 756 / JCM 1290 / NCIMB 6125 / NCTC 8237 / Type A))
Explore Q0TR53 
Go to UniProtKB:  Q0TR53
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ0TR53
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OAN
Query on OAN
Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]		O-(2-ACETAMIDO-2-DEOXY D-GLUCOPYRANOSYLIDENE) AMINO-N-PHENYLCARBAMATE
C15 H19 N3 O7
PBLNJFVQMUMOJY-JXZOILRNSA-N		 Ligand Interaction
CL
Query on CL
Download Ideal Coordinates CCD File 
E [auth B],
F [auth B]		CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
OAN PDBBind:  2CBJ Ki: 5.4 (nM) from 1 assay(s)
Binding MOAD:  2CBJ Ki: 5.4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 
  • Space Group: I 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.613α = 90
b = 145.745β = 90
c = 152.8γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-02-13
    Type: Initial release
  • Version 1.1: 2011-08-24
    Changes: Non-polymer description, Other, Refinement description, Version format compliance
  • Version 1.2: 2017-07-05
    Changes: Data collection
  • Version 1.3: 2018-02-28
    Changes: Database references, Source and taxonomy