2BJH

Crystal Structure Of S133A AnFaeA-ferulic acid complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 

Starting Model: experimental
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This is version 2.1 of the entry. See complete history


Literature

Probing the Determinants of Substrate Specificity of a Feruloyl Esterase, Anfaea, from Aspergillus Niger

Faulds, C.B.Molina, R.Gonzalez, R.Husband, F.Juge, N.Sanz-Aparicio, J.Hermoso, J.A.

(2005) FEBS J 272: 4362

  • DOI: https://doi.org/10.1111/j.1742-4658.2005.04849.x
  • Primary Citation of Related Structures:  
    2BJH

  • PubMed Abstract: 

    Feruloyl esterases hydrolyse phenolic groups involved in the cross-linking of arabinoxylan to other polymeric structures. This is important for opening the cell wall structure making material more accessible to glycoside hydrolases. Here we describe the crystal structure of inactive S133A mutant of type-A feruloyl esterase from Aspergillus niger (AnFaeA) in complex with a feruloylated trisaccharide substrate. Only the ferulic acid moiety of the substrate is visible in the electron density map, showing interactions through its OH and OCH(3) groups with the hydroxyl groups of Tyr80. The importance of aromatic and polar residues in the activity of AnFaeA was also evaluated using site-directed mutagenesis. Four mutant proteins were heterologously expressed in Pichia pastoris, and their kinetic properties determined against methyl esters of ferulic, sinapic, caffeic and p-coumaric acid. The k(cat) of Y80S, Y80V, W260S and W260V was drastically reduced compared to that of the wild-type enzyme. However, the replacement of Tyr80 and Trp260 with smaller residues broadened the substrate specificity of the enzyme, allowing the hydrolysis of methyl caffeate. The role of Tyr80 and Trp260 in AnFaeA are discussed in light of the three-dimensional structure.


  • Organizational Affiliation

    Institute of Food Research, Colney, Norwich, UK. craig.faulds@bbsrc.ac.uk


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FERULOYL ESTERASE A
A, B, C
260Aspergillus nigerMutation(s): 1 
EC: 3.1.1.73
UniProt
Find proteins for O42807 (Aspergillus niger)
Explore O42807 
Go to UniProtKB:  O42807
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO42807
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NDG
Query on NDG

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
K [auth C]
2-acetamido-2-deoxy-alpha-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-PVFLNQBWSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
D [auth A],
G [auth B],
J [auth C]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
FER
Query on FER

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B],
L [auth C]
3-(4-HYDROXY-3-METHOXYPHENYL)-2-PROPENOIC ACID
C10 H10 O4
KSEBMYQBYZTDHS-HWKANZROSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.75α = 90
b = 130.75β = 98.14
c = 76.5γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-09-07
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary
  • Version 2.1: 2023-12-13
    Changes: Data collection, Database references, Refinement description, Structure summary