8E83

Structure of 2-hydroxyisoflavanone synthase from Medicago truncatula


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

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Literature

The protein conformational basis of isoflavone biosynthesis.

Wang, X.Pan, H.Sagurthi, S.Paris, V.Zhuo, C.Dixon, R.A.

(2022) Commun Biol 5: 1249-1249

  • DOI: https://doi.org/10.1038/s42003-022-04222-x
  • Primary Citation of Related Structures:  
    8E83, 8EA1, 8EA2

  • PubMed Abstract: 

    Isoflavonoids play important roles in plant defense and also exhibit a range of mammalian health-promoting activities. Their biosynthesis is initiated by two enzymes with unusual catalytic activities; 2-hydroxyisoflavanone synthase (2-HIS), a membrane-bound cytochrome P450 catalyzing a coupled aryl-ring migration and hydroxylation, and 2-hydroxyisoflavanone dehydratase (2-HID), a member of a large carboxylesterase family that paradoxically catalyzes dehydration of 2-hydroxyisoflavanones to isoflavone. Here we report the crystal structures of 2-HIS from Medicago truncatula and 2-HID from Pueraria lobata. The 2-HIS structure reveals a unique cytochrome P450 conformation and heme and substrate binding mode that facilitate the coupled aryl-ring migration and hydroxylation reactions. The 2-HID structure reveals the active site architecture and putative catalytic residues for the dual dehydratase and carboxylesterase activities. Mutagenesis studies revealed key residues involved in substrate binding and specificity. Understanding the structural basis of isoflavone biosynthesis will facilitate the engineering of new bioactive isoflavonoids.


  • Organizational Affiliation

    BioDiscovery Institute and Department of Biological Sciences, University of North Texas, Denton, TX, 76203-5017, USA. Xiaoqiang.Wang@unt.edu.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isoflavone synthase 1
A, B
503Medicago truncatulaMutation(s): 0 
Gene Names: MtrunA17_Chr4g0046351
EC: 1.14.14.87
UniProt
Find proteins for A0A072UMR6 (Medicago truncatula)
Explore A0A072UMR6 
Go to UniProtKB:  A0A072UMR6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A072UMR6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.119α = 90
b = 73.787β = 93.476
c = 148.671γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other government--

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-30
    Type: Initial release
  • Version 1.1: 2023-02-01
    Changes: Advisory