5CXU

Structure of the CE1 ferulic acid esterase AmCE1/Fae1A, from the anaerobic fungi Anaeromyces mucronatus in the absence of substrate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.140 
  • R-Value Observed: 0.141 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

Contributions of a unique beta-clamp to substrate recognition illuminates the molecular basis of exolysis in ferulic acid esterases.

Gruninger, R.J.Cote, C.McAllister, T.A.Abbott, D.W.

(2016) Biochem J 473: 839-849

  • DOI: https://doi.org/10.1042/BJ20151153
  • Primary Citation of Related Structures:  
    5CXU, 5CXX

  • PubMed Abstract: 

    Lignocellulosic biomass is a promising renewable resource; however, deconstruction of this material is still the rate-limiting step. Major obstacles in the biocatalytic turnover of lignocellulose are ester-linked decorations that prevent access to primary structural polysaccharides. Enzymes targeting these esters represent promising biotools for increasing bioconversion efficiency. Ruminant livestock are unique in their ability to degrade lignocellulose through the action of their gut microbiome. The anaerobic fungi (phylum Neocallimastigomycota) are key members of this ecosystem that express a large repertoire of carbohydrate-active enzymes (CAZymes) with little sequence identity with characterized CAZymes [Lombard, Golaconda, Drula, Coutinho and Henrissat (2014) Nucleic Acids Res. 42: , D490-D495]. We have identified a carbohydrate esterase family 1 (CE1) ferulic acid esterase (FAE) belonging to Anaeromyces mucronatus(AmCE1/Fae1a), and determined its X-ray structure in both the presence [1.55 Å (1 Å=0.1 nm)] and absence (1.60 Å) of ferulic acid. AmCE1 adopts an α/β-hydrolase fold that is structurally conserved with bacterial FAEs, and possesses a unique loop, termed the β-clamp, that encloses the ligand. Isothermal titration calorimetry reveals that substrate binding is driven by enthalpic contributions, which overcomes a large entropic penalty. A comparative analysis of AmCE1 with related enzymes has uncovered the apparent structural basis for differential FAE activities targeting cross-linking ferulic acid conjugates compared with terminal decorations. Based on comparisons to structurally characterized FAEs, we propose that the β-clamp may define the structural basis of exolytic activities in FAEs. This provides a structure-based tool for predicting exolysis and endolysis in CE1. These insights hold promise for rationally identifying enzymes tailored for bioconversion of biomass with variations in cell wall composition.


  • Organizational Affiliation

    Lethbridge Research Centre, Agriculture and Agri-Food Canada, 5403-1st Ave South, Lethbridge, AB, Canada, T1J 4B1 robert.gruninger@agr.gc.ca wade.abbott@agr.gc.ca.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ferulic acid esterase AmCE1/Fae1A275Anaeromyces mucronatusMutation(s): 0 
Gene Names: fae1A
EC: 3.1.1.73
UniProt
Find proteins for F2YCB6 (Anaeromyces mucronatus)
Explore F2YCB6 
Go to UniProtKB:  F2YCB6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF2YCB6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
B [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.140 
  • R-Value Observed: 0.141 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.87α = 90
b = 101.87β = 90
c = 52.48γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-27
    Type: Initial release
  • Version 1.1: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description