6F9Q

Binary complex of a 7S-cis-cis-nepetalactol cyclase from Nepeta mussinii with NAD+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

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This is version 1.1 of the entry. See complete history


Literature

Uncoupled activation and cyclization in catmint reductive terpenoid biosynthesis.

Lichman, B.R.Kamileen, M.O.Titchiner, G.R.Saalbach, G.Stevenson, C.E.M.Lawson, D.M.O'Connor, S.E.

(2019) Nat Chem Biol 15: 71-79

  • DOI: 10.1038/s41589-018-0185-2
  • Primary Citation of Related Structures:  
    6F9Q

  • PubMed Abstract: 
  • Terpene synthases typically form complex molecular scaffolds by concerted activation and cyclization of linear starting materials in a single enzyme active site. Here we show that iridoid synthase, an atypical reductive terpene synthase, catalyzes the activation of its substrate 8-oxogeranial into a reactive enol intermediate, but does not catalyze the subsequent cyclization into nepetalactol ...

    Terpene synthases typically form complex molecular scaffolds by concerted activation and cyclization of linear starting materials in a single enzyme active site. Here we show that iridoid synthase, an atypical reductive terpene synthase, catalyzes the activation of its substrate 8-oxogeranial into a reactive enol intermediate, but does not catalyze the subsequent cyclization into nepetalactol. This discovery led us to identify a class of nepetalactol-related short-chain dehydrogenase enzymes (NEPS) from catmint (Nepeta mussinii) that capture this reactive intermediate and catalyze the stereoselective cyclisation into distinct nepetalactol stereoisomers. Subsequent oxidation of nepetalactols by NEPS1 provides nepetalactones, metabolites that are well known for both insect-repellent activity and euphoric effects in cats. Structural characterization of the NEPS3 cyclase reveals that it binds to NAD + yet does not utilize it chemically for a non-oxidoreductive formal [4 + 2] cyclization. These discoveries will complement metabolic reconstructions of iridoid and monoterpene indole alkaloid biosynthesis.


    Organizational Affiliation

    The John Innes Centre, Department of Biological Chemistry, Norwich Research Park, Norwich, UK. sarah.Oconnor@jic.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
7S-cis-cis-nepetalactol cyclaseA, B, C, D272Nepeta racemosaMutation(s): 0 
Gene Names: NEPS3
EC: 5.4.99 (PDB Primary Data), 5.5.1.35 (UniProt)
UniProt
Find proteins for A0A3Q8GLE8 (Nepeta racemosa)
Explore A0A3Q8GLE8 
Go to UniProtKB:  A0A3Q8GLE8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.921α = 90
b = 107.75β = 104.26
c = 69.361γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
US National Science Foundation Plant Genome Research ProgramUnited StatesIOS-1444499
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/L014130/1
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/P012523/1

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-12
    Type: Initial release
  • Version 1.1: 2018-12-19
    Changes: Data collection, Database references