3GS6

Vibrio Cholerea family 3 glycoside hydrolase (NagZ)in complex with N-butyryl-PUGNAc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Insight into a strategy for attenuating AmpC-mediated beta-lactam resistance: structural basis for selective inhibition of the glycoside hydrolase NagZ.

Balcewich, M.D.Stubbs, K.A.He, Y.James, T.W.Davies, G.J.Vocadlo, D.J.Mark, B.L.

(2009) Protein Sci 18: 1541-1551

  • DOI: 10.1002/pro.137
  • Primary Citation of Related Structures:  
    2WCA, 3GS6, 3GSM

  • PubMed Abstract: 
  • NagZ is an exo-N-acetyl-beta-glucosaminidase, found within Gram-negative bacteria, that acts in the peptidoglycan recycling pathway to cleave N-acetylglucosamine residues off peptidoglycan fragments. This activity is required for resistance to cephalosporins mediated by inducible AmpC beta-lactamase ...

    NagZ is an exo-N-acetyl-beta-glucosaminidase, found within Gram-negative bacteria, that acts in the peptidoglycan recycling pathway to cleave N-acetylglucosamine residues off peptidoglycan fragments. This activity is required for resistance to cephalosporins mediated by inducible AmpC beta-lactamase. NagZ uses a catalytic mechanism involving a covalent glycosyl enzyme intermediate, unlike that of the human exo-N-acetyl-beta-glucosaminidases: O-GlcNAcase and the beta-hexosaminidase isoenzymes. These latter enzymes, which remove GlcNAc from glycoconjugates, use a neighboring-group catalytic mechanism that proceeds through an oxazoline intermediate. Exploiting these mechanistic differences we previously developed 2-N-acyl derivatives of O-(2-acetamido-2-deoxy-D-glucopyranosylidene)amino-N-phenylcarbamate (PUGNAc), which selectively inhibits NagZ over the functionally related human enzymes and attenuate antibiotic resistance in Gram-negatives that harbor inducible AmpC. To understand the structural basis for the selectivity of these inhibitors for NagZ, we have determined its crystallographic structure in complex with N-valeryl-PUGNAc, the most selective known inhibitor of NagZ over both the human beta-hexosaminidases and O-GlcNAcase. The selectivity stems from the five-carbon acyl chain of N-valeryl-PUGNAc, which we found ordered within the enzyme active site. In contrast, a structure determination of a human O-GlcNAcase homologue bound to a related inhibitor N-butyryl-PUGNAc, which bears a four-carbon chain and is selective for both NagZ and O-GlcNAcase over the human beta-hexosamnidases, reveals that this inhibitor induces several conformational changes in the active site of this O-GlcNAcase homologue. A comparison of these complexes, and with the human beta-hexosaminidases, reveals how selectivity for NagZ can be engineered by altering the 2-N-acyl substituent of PUGNAc to develop inhibitors that repress AmpC mediated beta-lactam resistance.


    Organizational Affiliation

    Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-hexosaminidaseA340Vibrio choleraeMutation(s): 3 
Gene Names: nagZVC_0692
EC: 3.2.1.52
UniProt
Find proteins for Q9KU37 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KU37 
Go to UniProtKB:  Q9KU37
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KU37
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NP6
Query on NP6

Download Ideal Coordinates CCD File 
B [auth A][[(3R,4R,5S,6R)-3-(BUTANOYLAMINO)-4,5-DIHYDROXY-6-(HYDROXYMETHYL)OXAN-2-YLIDENE]AMINO] N-PHENYLCARBAMATE
C17 H23 N3 O7
ITVRELFVFCOUMV-ZVZWZHPPSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.778α = 90
b = 86.021β = 90
c = 86.217γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2011-08-17
    Changes: Non-polymer description
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations