Crystal structure of EasA, an old yellow enzyme from Aspergillus fumigatus

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.182 

Starting Model: experimental
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Structure of an Aspergillus fumigatus old yellow enzyme (EasA) involved in ergot alkaloid biosynthesis.

Chilton, A.S.Ellis, A.L.Lamb, A.L.

(2014) Acta Crystallogr Sect F Struct Biol Cryst Commun 70: 1328-1332

  • DOI: https://doi.org/10.1107/S2053230X14018962
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Aspergillus fumigatus old yellow enzyme (OYE) EasA reduces chanoclavine-I aldehyde to dihydrochanoclavine aldehyde and works in conjunction with festuclavine synthase at the branchpoint for ergot alkaloid pathways. The crystal structure of the FMN-loaded EasA was determined to 1.8 Å resolution. The active-site amino acids of OYE are conserved, supporting a similar mechanism for reduction of the α/β-unsaturated aldehyde. The C-terminal tail of one monomer packs into the active site of a monomer in the next asymmetric unit, which is most likely to be a crystallization artifact and not a mechanism of self-regulation.

  • Organizational Affiliation

    Molecular Biosciences, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chanoclavine-I aldehyde reductase392Aspergillus fumigatus Af293Mutation(s): 0 
Gene Names: AFUA_2G17960EasAfgaOx3
Find proteins for Q4WZ70 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore Q4WZ70 
Go to UniProtKB:  Q4WZ70
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4WZ70
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.456α = 90
b = 65.913β = 90
c = 115.219γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

  • Released Date: 2014-10-22 
  • Deposition Author(s): Lamb, A.L.

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-22
    Type: Initial release
  • Version 1.1: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description