Experimental Data Snapshot

  • Resolution: 1.92 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

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Engineering the "Missing Link" in Biosynthetic (-)-Menthol Production: Bacterial Isopulegone Isomerase.

Currin, A.Dunstan, M.S.Johannissen, L.O.Hollywood, K.A.Vinaixa, M.Jervis, A.J.Swainston, N.Rattray, N.J.W.Gardiner, J.M.Kell, D.B.Takano, E.Toogood, H.S.Scrutton, N.S.

(2018) ACS Catal 8: 2012-2020

  • DOI: https://doi.org/10.1021/acscatal.7b04115
  • Primary Citation of Related Structures:  
    6F4Y, 6F50, 6F53, 6F54

  • PubMed Abstract: 

    The realization of a synthetic biology approach to microbial (1 R ,2 S ,5 R )-( - )-menthol ( 1 ) production relies on the identification of a gene encoding an isopulegone isomerase (IPGI), the only enzyme in the Mentha piperita biosynthetic pathway as yet unidentified. We demonstrate that Δ5-3-ketosteroid isomerase (KSI) from Pseudomonas putida can act as an IPGI, producing ( R )-(+)-pulegone (( R )- 2 ) from (+)- cis -isopulegone ( 3 ). Using a robotics-driven semirational design strategy, we identified a key KSI variant encoding four active site mutations, which confer a 4.3-fold increase in activity over the wild-type enzyme. This was assisted by the generation of crystal structures of four KSI variants, combined with molecular modeling of 3 binding to identify key active site residue targets. The KSI variant was demonstrated to function efficiently within cascade biocatalytic reactions with downstream Mentha enzymes pulegone reductase and (-)-menthone:(-)-menthol reductase to generate 1 from 3 . This study introduces the use of a recombinant IPGI, engineered to function efficiently within a biosynthetic pathway for the production of 1 in microorganisms.

  • Organizational Affiliation

    Manchester Centre for Fine and Speciality Chemicals (SYNBIOCHEM) and School of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Steroid Delta-isomerase
A, B
125Pseudomonas putidaMutation(s): 1 
Gene Names: ksi
Find proteins for P07445 (Pseudomonas putida)
Explore P07445 
Go to UniProtKB:  P07445
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07445
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.92 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.17α = 90
b = 73.53β = 90
c = 94.82γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
xia2data reduction
xia2data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-23
    Type: Initial release