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 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1111/j.1742-4658.2005.04849.x

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FERULOYL ESTERASE A
A, B, C
260Aspergillus nigerMutation(s): 1 
Gene Names: faeA
EC: 3.1.1.73
Find proteins for O42807 (Aspergillus niger)
Go to UniProtKB:  O42807
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDG
Query on NDG

Download SDF File 
Download CCD File 
A, B, C
2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE
C8 H15 N O6
OVRNDRQMDRJTHS-PVFLNQBWSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
FER
Query on FER

Download SDF File 
Download CCD File 
A, B, C
3-(4-HYDROXY-3-METHOXYPHENYL)-2-PROPENOIC ACID
FERULIC ACID
C10 H10 O4
KSEBMYQBYZTDHS-HWKANZROSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.216 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 46.750α = 90.00
b = 130.750β = 98.14
c = 76.500γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
MOSFLMdata reduction
CNSrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-09-07
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance