4HFN

X-ray Crystal Structure of a Ternary Complex of Double Bond Reductase from Nicotiana tabacum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

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


Literature

Biocatalytic Asymmetric Alkene Reduction: Crystal Structure and Characterization of a Double Bond Reductase fromNicotiana tabacum.

Mansell, D.J.Toogood, H.S.Waller, J.Hughes, J.M.Levy, C.W.Gardiner, J.M.Scrutton, N.S.

(2013) ACS Catal 3: 370-379

  • DOI: https://doi.org/10.1021/cs300709m
  • Primary Citation of Related Structures:  
    4HFJ, 4HFM, 4HFN

  • PubMed Abstract: 

    The application of biocatalysis for the asymmetric reduction of activated C=C is a powerful tool for the manufacture of high-value chemical commodities. The biocatalytic potential of "-ene" reductases from the Old Yellow Enzyme (OYE) family of oxidoreductases is well-known; however, the specificity of these enzymes toward mainly small molecule substrates has highlighted the need to discover "-ene" reductases from different enzymatic classes to broaden industrial applicability. Here, we describe the characterization of a flavin-free double bond reductase from Nicotiana tabacum (NtDBR), which belongs to the leukotriene B 4 dehydrogenase (LTD) subfamily of the zinc-independent, medium chain dehydrogenase/reductase superfamily of enzymes. Using steady-state kinetics and biotransformation reactions, we have demonstrated the regio- and stereospecificity of NtDBR against a variety of α,β-unsaturated activated alkenes. In addition to catalyzing the reduction of typical LTD substrates and several classical OYE-like substrates, NtDBR also exhibited complementary activity by reducing non-OYE substrates (i.e., reducing the exocyclic C=C double bond of ( R )-pulegone) and in some cases showing an opposite stereopreference in comparison with the OYE family member pentaerythritol tetranitrate (PETN) reductase. This serves to augment classical OYE "-ene" reductase activity and, coupled with its aerobic stability, emphasizes the potential industrial value of NtDBR. Furthermore, we also report the X-ray crystal structures of the holo-, binary NADP(H)-bound, and ternary [NADP + and 4-hydroxy-3-methoxycinnamaldehyde ( 9a )-bound] NtDBR complexes. These will underpin structure-driven site-saturated mutagenesis studies aimed at enhancing the reactivity, stereochemistry, and specificity of this enzyme.


  • Organizational Affiliation

    Manchester Institute of Biotechnology, School of Chemistry, and Faculty of Life Sciences, University of Manchester , Manchester, U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Allyl alcohol dehydrogenase
A, B
351Nicotiana tabacumMutation(s): 0 
Gene Names: NtADH
EC: 1.3.1.74 (PDB Primary Data), 1.3.1.102 (UniProt)
UniProt
Find proteins for Q9SLN8 (Nicotiana tabacum)
Explore Q9SLN8 
Go to UniProtKB:  Q9SLN8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9SLN8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.86α = 90
b = 149.86β = 115.96
c = 67.21γ = 90
Software Package:
Software NamePurpose
GDAdata collection
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-01-30
    Type: Initial release
  • Version 1.1: 2018-04-18
    Changes: Data collection, Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description