8DQQ

Crystal structure of Arabidopsis thaliana COSY in complex with scopoletin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.256 

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


Literature

Emergence of a proton exchange-based isomerization and lactonization mechanism in the plant coumarin synthase COSY.

Kim, C.Y.Mitchell, A.J.Kastner, D.W.Albright, C.E.Gutierrez, M.A.Glinkerman, C.M.Kulik, H.J.Weng, J.K.

(2023) Nat Commun 14: 597-597

  • DOI: https://doi.org/10.1038/s41467-023-36299-1
  • Primary Citation of Related Structures:  
    8DQO, 8DQP, 8DQQ, 8DQR

  • PubMed Abstract: 

    Plants contain rapidly evolving specialized enzymes that support the biosynthesis of functionally diverse natural products. In coumarin biosynthesis, a BAHD acyltransferase-family enzyme COSY was recently discovered to accelerate coumarin formation as the only known BAHD enzyme to catalyze an intramolecular acyl transfer reaction. Here we investigate the structural and mechanistic basis for COSY's coumarin synthase activity. Our structural analyses reveal an unconventional active-site configuration adapted to COSY's specialized activity. Through mutagenesis studies and deuterium exchange experiments, we identify a unique proton exchange mechanism at the α-carbon of the o-hydroxylated trans-hydroxycinnamoyl-CoA substrates during the catalytic cycle of COSY. Quantum mechanical cluster modeling and molecular dynamics further support this key mechanism for lowering the activation energy of the rate-limiting trans-to-cis isomerization step in coumarin production. This study unveils an unconventional catalytic mechanism mediated by a BAHD-family enzyme, and sheds light on COSY's evolutionary origin and its recruitment to coumarin biosynthesis in eudicots.


  • Organizational Affiliation

    Whitehead Institute for Biomedical Research, Cambridge, MA, 02142, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Coumarin Synthase
A, B
451Arabidopsis thalianaMutation(s): 0 
Gene Names: At1g28680F1K23.12F1K23_12
UniProt
Find proteins for Q8LF28 (Arabidopsis thaliana)
Explore Q8LF28 
Go to UniProtKB:  Q8LF28
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8LF28
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.256 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.907α = 90
b = 58.771β = 90
c = 273.611γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
W. M. Keck FoundationUnited States--
Other privateFamily Larsson-Rosenquist Foundation
Other privateBeckman Young Investigator Program

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-11
    Type: Initial release
  • Version 1.1: 2023-02-15
    Changes: Database references
  • Version 1.2: 2023-10-25
    Changes: Data collection, Refinement description