4OUE

Crystal structure of an a-L-Fucosidase GH29 from Bacteroides thetaiotaomicron (BT2192) in complex with IPTG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.155 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Unraveling the Substrate Recognition Mechanism and Specificity of the Unusual Glycosyl Hydrolase Family 29 BT2192 from Bacteroides thetaiotaomicron.

Guillotin, L.Lafite, P.Daniellou, R.

(2014) Biochemistry 53: 1447-1455

  • DOI: 10.1021/bi400951q
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Glycosyl hydrolase (GH) family 29 (CAZy database) consists of retaining α-l-fucosidases. We have identified BT2192, a protein from Bacteroides thetaiotaomicron, as the first GH29 representative exhibiting both weak α-l-fucosidase and β-d-galactosidas ...

    Glycosyl hydrolase (GH) family 29 (CAZy database) consists of retaining α-l-fucosidases. We have identified BT2192, a protein from Bacteroides thetaiotaomicron, as the first GH29 representative exhibiting both weak α-l-fucosidase and β-d-galactosidase activities. Determination and analysis of X-ray structures of BT2192 in complex with β-d-galactoside competitive inhibitors showed a new binding mode different from that of known GH29 enzymes. Three point mutations, specific to BT2192, prevent the canonical GH29 substrate α-l-fucose from binding efficiently to the fucosidase-like active site relative to other GH29 enzymes. β-d-Galactoside analogues bind and interact in a second pocket, which is not visible in other reported GH29 structures. Molecular simulations helped in the assessment of the flexibility of both substrates in their respective pocket. Hydrolysis of the fucosyl moiety from the putative natural substrates like 3-fucosyllactose or Lewis(X) antigen would be mainly due to the efficient interactions with the galactosyl moiety, in the second binding site, located more than 6-7 Å apart.


    Organizational Affiliation

    Université Orléans, CNRS, ICOA, UMR 7311 , F-45067 Orleans, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative lipoprotein
A, B
469Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482)Mutation(s): 0 
Find proteins for Q8A5P6 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482))
Go to UniProtKB:  Q8A5P6
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
IPT
Query on IPT

Download SDF File 
Download CCD File 
A, B
ISOPROPYL-1-BETA-D-THIOGALACTOSIDE
1-(ISOPROPYLTHIO)-BETA-GALACTOPYRANSIDE
C9 H18 O5 S
BPHPUYQFMNQIOC-NXRLNHOXSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.155 
  • Space Group: I 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 125.680α = 90.00
b = 122.080β = 90.00
c = 159.620γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XSCALEdata scaling
PHENIXrefinement
MOLREPphasing
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-02-26
    Type: Initial release
  • Version 1.1: 2014-03-12
    Type: Database references, Structure summary
  • Version 1.2: 2014-04-02
    Type: Database references