1G66

ACETYLXYLAN ESTERASE AT 0.90 ANGSTROM RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.90 Å
  • R-Value Free: 0.132 
  • R-Value Work: 0.107 
  • R-Value Observed: 0.107 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Multiple conformations of catalytic serine and histidine in acetylxylan esterase at 0.90 A.

Ghosh, D.Sawicki, M.Lala, P.Erman, M.Pangborn, W.Eyzaguirre, J.Gutierrez, R.Jornvall, H.Thiel, D.J.

(2001) J Biol Chem 276: 11159-11166

  • DOI: 10.1074/jbc.M008831200
  • Primary Citation of Related Structures:  
    1G66

  • PubMed Abstract: 
  • Acetylxylan esterase (AXEII; 207 amino acids) from Penicillium purpurogenum has substrate specificities toward acetate esters of d-xylopyranose residues in xylan and belongs to a new class of alpha/beta hydrolases. The crystal structure of AXEII has ...

    Acetylxylan esterase (AXEII; 207 amino acids) from Penicillium purpurogenum has substrate specificities toward acetate esters of d-xylopyranose residues in xylan and belongs to a new class of alpha/beta hydrolases. The crystal structure of AXEII has been determined by single isomorphous replacement and anomalous scattering, and refined at 0.90- and 1.10-A resolutions with data collected at 85 K and 295 K, respectively. The tertiary structure consists of a doubly wound alpha/beta sandwich, having a central six-stranded parallel beta-sheet flanked by two parallel alpha-helices on each side. The catalytic residues Ser(90), His(187), and Asp(175) are located at the C-terminal end of the sheet, an exposed region of the molecule. The serine and histidine side chains in the 295 K structure show the frequently observed conformations in which Ser(90) is trans and the hydroxyl group is in the plane of the imidazole ring of His(187). However, the structure at 85 K displays an additional conformation in which Ser(90) side-chain hydroxyl is away from the plane of the imidazole ring of His(187). The His(187) side chain forms a hydrogen bond with a sulfate ion and adopts an altered conformation. The only other known hydrolase that has a similar tertiary structure is Fusarium solani cutinase. The exposed nature of the catalytic triad suggests that AXEII is a pure esterase, i.e. an alpha/beta hydrolase with specificity for nonlipidic polar substrates.


    Related Citations: 
    • Determination of a protein structure by iodination: the structure of iodinated acetylxylan esterase
      Ghosh, D., Erman, M., Sawicki, M., Lala, P., Weeks, D.R., Li, N., Pangborn, W., Thiel, D.J., Jornvall, H., Gutierrez, R., Eyzaguirre, J.
      (1999) Acta Crystallogr D Biol Crystallogr 55: 779
    • Characterization of crystals of P. purpurogenum acetyl xylan esterase from high resolution X-ray diffraction
      (1996) Proteins 24: 523

    Organizational Affiliation

    Hauptman-Woodward Medical Research Institute, Buffalo, New York 14203, USA. ghosh@hwi.buffalo.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ACETYL XYLAN ESTERASE IIA207Talaromyces purpureogenusMutation(s): 0 
Gene Names: axe-2axeII
EC: 3.1.1.6 (PDB Primary Data), 3.1.1.72 (UniProt)
Find proteins for O59893 (Talaromyces purpureogenus)
Explore O59893 
Go to UniProtKB:  O59893
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.90 Å
  • R-Value Free: 0.132 
  • R-Value Work: 0.107 
  • R-Value Observed: 0.107 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.541α = 90
b = 59.898β = 90
c = 71.392γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASESphasing
SHELXL-97refinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-01-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance