Ene-reductase (ER/OYE) from Ralstonia (Cupriavidus) metallidurans

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Structural investigation into the C-terminal extension of the ene-reductase from Ralstonia (Cupriavidus) metallidurans.

Opperman, D.J.

(2017) Proteins 85: 2252-2257

  • DOI: https://doi.org/10.1002/prot.25372
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Ene-reductases (ERs), or Old Yellow Enzymes, catalyze the asymmetric reduction of various activated alkenes. This class of biocatalysts is considered an attractive alternative to current chemical technologies for hydrogenation due to their high selectivity and specificity. Here the X-ray crystal structure of RmER, a "thermophilic"-like ER from Ralstonia (Cupriavidus) metallidurans, is reported. Unlike other members of this class of ERs, RmER is monomeric in solution which we previously related to its atypical elongated C-terminus. A typical dimer interface was however observed in our crystal structure, with the conserved Arg-"finger" forming part of the adjacent monomer's active site and the elongated C-terminus extending into the active site through contacting the "capping" domain. This dimerization also resulted in the loss of one FMN cofactor from each dimer pair. This potential transient dimerization and dissociation of FMN could conceivably explain the rapid rates previously observed when an FMN light-driven cofactor regeneration system was used during catalysis with RmER.

  • Organizational Affiliation

    Department of Biotechnology, University of the Free State, 205 Nelson Mandela Drive, Bloemfontein, 9300, South Africa.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative NADH-depentdent flavin oxidoreductase
A, B, C, D
371Cupriavidus metalliduransMutation(s): 0 
Gene Names: Rmet_4859
Find proteins for Q1LDQ5 (Cupriavidus metallidurans (strain ATCC 43123 / DSM 2839 / NBRC 102507 / CH34))
Explore Q1LDQ5 
Go to UniProtKB:  Q1LDQ5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1LDQ5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.97α = 90
b = 95.04β = 90
c = 208.68γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-09-06
    Type: Initial release
  • Version 1.1: 2017-11-15
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description