1QOZ

Catalytic core domain of acetyl xylan esterase from Trichoderma reesei


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Three-Dimensional Structure of the Catalytic Core of Acetylxylan Esterase from Trichoderma Reesei: Insights Into the Deacetylation Mechanism

Hakulinen, N.Tenkanen, M.Rouvinen, J.

(2000) J.Struct.Biol. 132: 180

  • DOI: 10.1006/jsbi.2000.4318

  • PubMed Abstract: 
  • Acetylxylan esterase from Trichoderma reesei removes acetyl side groups from xylan. The crystal structure of the catalytic core of the enzyme was solved at 1.9 A resolution. The core has an alpha/beta/alpha sandwich fold, similar to that of homologou ...

    Acetylxylan esterase from Trichoderma reesei removes acetyl side groups from xylan. The crystal structure of the catalytic core of the enzyme was solved at 1.9 A resolution. The core has an alpha/beta/alpha sandwich fold, similar to that of homologous acetylxylan esterase from Penicillium purpurogenum and cutinase from Fusarium solani. All three enzymes belong to family 5 of the carbohydrate esterases and the superfamily of the alpha/beta hydrolase fold. Evidently, the enzymes have diverged from a common ancestor and they share the same catalytic mechanism. The catalytic machinery of acetylxylan esterase from T. reesei was studied by comparison with cutinase, the catalytic site of which is well known. Acetylxylan esterase is a pure serine esterase having a catalytic triad (Ser90, His187, and Asp175) and an oxyanion hole (Thr13 N, and Thr13 O gamma). Although the catalytic triad of acetylxylan esterase has been reported previously, there has been no mention of the oxyanion hole. A model for the binding of substrates is presented on the basis of the docking of xylose. Acetylxylan esterase from T. reesei is able to deacetylate both mono- and double-acetylated residues, but it is not able to remove acetyl groups located close to large side groups such as 4-O-methylglucuronic acid. If the xylopyranoside residue is double-acetylated, both acetyl groups are removed by the catalytic triad: first one acetyl group is removed and then the residue is reorientated so that the nucleophilic oxygen of serine can attack the second acetyl group.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Diffraction Studies of the Catalytic Core of Acetylxylan Esterase from Trichoderma Reesei
      Hakulinen, N.,Tenkanen, M.,Rouvinen, J.
      (1998) Acta Crystallogr.,Sect.D 54: 430


    Organizational Affiliation

    Department of Chemistry, University of Joensuu, FIN-80101 Joensuu, Finland. nina.hakulinen@joesnuu.fi




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETYL XYLAN ESTERASE
A, B
207Hypocrea jecorinaGene Names: axe1
EC: 3.1.1.72
Find proteins for Q99034 (Hypocrea jecorina)
Go to UniProtKB:  Q99034
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A, B
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.186 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 50.300α = 107.70
b = 61.000β = 113.50
c = 40.000γ = 98.80
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-11-24
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-07-05
    Type: Data collection