6F4Y

CRYSTAL STRUCTURE OF KETOSTEROID ISOMERASE VARIANT D103S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

wwPDB Validation   3D Report Full Report


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Literature

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

  • 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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Steroid Delta-isomeraseA, B125Pseudomonas putidaMutation(s): 1 
Gene Names: ksi
EC: 5.3.3.1
UniProt
Find proteins for P07445 (Pseudomonas putida)
Explore P07445 
Go to UniProtKB:  P07445
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
PHENIXrefinement
PDB_EXTRACTdata extraction
xia2data reduction
xia2data scaling
PHASERphasing

Structure Validation

View Full Validation Report




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