2PC8

E292Q mutant of EXO-B-(1,3)-Glucanase from Candida Albicans in complex with two separately bound glucopyranoside units at 1.8 A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.163 
  • R-Value Work: 0.136 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Carbohydrate binding sites in Candida albicans exo-beta-1,3-glucanase and the role of the Phe-Phe 'clamp' at the active site entrance.

Patrick, W.M.Nakatani, Y.Cutfield, S.M.Sharpe, M.L.Ramsay, R.J.Cutfield, J.F.

(2010) Febs J. 277: 4549-4561

  • DOI: 10.1111/j.1742-4658.2010.07869.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Candida albicans exo-β-1,3-glucanase (Exg; EC 3.2.1.58) is implicated in cell wall β-D-glucan remodelling through its glucosyl hydrolase and/or transglucosylase activities. A pair of antiparallel phenylalanyl residues (F144 and F258) flank the entran ...

    Candida albicans exo-β-1,3-glucanase (Exg; EC 3.2.1.58) is implicated in cell wall β-D-glucan remodelling through its glucosyl hydrolase and/or transglucosylase activities. A pair of antiparallel phenylalanyl residues (F144 and F258) flank the entrance to the active site pocket. Various Exg mutants were studied using steady-state kinetics and crystallography aiming to understand the roles played by these residues in positioning the β-1,3-D-glucan substrate. Mutations at the Phe-Phe entranceway demonstrated the requirement for double-sided CH/π interactions at the +1 subsite, and the necessity for phenylalanine rather than tyrosine or tryptophan. The Tyr-Tyr double mutations introduced ordered water molecules into the entranceway. A third Phe residue (F229) nearby was evaluated as a possible +2 subsite. The inactive double mutant E292S/F229A complexed with laminaritriose has provided the first picture of substrate binding to Exg and demonstrated how the Phe-Phe arrangement acts as a clamp at the +1 subsite. The terminal sugar at the -1 site showed displacement from the position of a monosaccharide analogue with interchange of water molecules and sugar hydroxyls. An unexpected additional glucose binding site, well removed from the active site, was revealed. This site may enable Exg to associate with the branched glucan structure of the C. albicans cell wall.


    Related Citations: 
    • The structure of the exo-beta-(1,3)-glucanase from Candida albicans in native and bound forms: relationship between a pocket and groove in family 5 glycosyl hydrolases.
      Cutfield, S.M.,Davies, G.J.,Murshudov, G.,Anderson, B.F.,Moody, P.C.,Sullivan, P.A.,Cutfield, J.F.
      (1999) J.Mol.Biol. 294: 771


    Organizational Affiliation

    Department of Biochemistry, University of Otago, Dunedin, New Zealand.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hypothetical protein XOG1
A
400Candida albicans (strain SC5314 / ATCC MYA-2876)Mutation(s): 1 
Gene Names: XOG1 (EXG, EXG1, XOG)
EC: 2.4.1.-, 3.2.1.58
Find proteins for P29717 (Candida albicans (strain SC5314 / ATCC MYA-2876))
Go to UniProtKB:  P29717
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download SDF File 
Download CCD File 
A
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.163 
  • R-Value Work: 0.136 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 59.950α = 90.00
b = 65.320β = 90.00
c = 96.540γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
Agrovatadata scaling
REFMACrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
ROTAVATAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-04-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2013-06-19
    Type: Database references
  • Version 1.3: 2017-10-18
    Type: Refinement description