1G66

ACETYLXYLAN ESTERASE AT 0.90 ANGSTROM RESOLUTION

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.9 Å
  • R-Value Free: 0.132 
  • R-Value Work: 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

  • 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.,Sect.D 55: 779

    Organizational Affiliation: 

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETYL XYLAN ESTERASE II
A
207Talaromyces purpureogenusMutation(s): 0 
Gene Names: axe-2 (axeII)
EC: 3.1.1.72
Find proteins for O59893 (Talaromyces purpureogenus)
Go to UniProtKB:  O59893
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4
Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL
Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.9 Å
  • R-Value Free: 0.132 
  • R-Value Work: 0.107 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 34.541α = 90.00
b = 59.898β = 90.00
c = 71.392γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHASESphasing
SHELXL-97refinement
DENZOdata reduction

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

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