Crystal structure of Medicago truncatula UGT85H2- Insights into the structural basis of a multifunctional (Iso) flavonoid glycosyltransferase

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Crystal Structure of Medicago truncatula UGT85H2 - Insights into the Structural Basis of a Multifunctional (Iso)flavonoid Glycosyltransferase.

Li, L.Modolo, L.V.Escamilla-Trevino, L.L.Achnine, L.Dixon, R.A.Wang, X.

(2007) J Mol Biol 370: 951-963

  • DOI: https://doi.org/10.1016/j.jmb.2007.05.036
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    (Iso)flavonoids are a diverse group of plant secondary metabolites with important effects on plant, animal and human health. They exist in various glycosidic forms. Glycosylation, which may determine their bioactivities and functions, is controlled by specific plant uridine diphosphate glycosyltransferases (UGTs). We describe a new multifunctional (iso)flavonoid glycosyltransferase, UGT85H2, from the model legume Medicago truncatula with activity towards a number of phenylpropanoid-derived natural products including the flavonol kaempferol, the isoflavone biochanin A, and the chalcone isoliquiritigenin. The crystal structure of UGT85H2 has been determined at 2.1 A resolution, and reveals distinct structural features that are different from those of other UGTs and related to the enzyme's functions and substrate specificities. Structural and comparative analyses revealed the putative binding sites for the donor and acceptor substrates that are located in a large cleft formed between the two domains of the enzyme, and indicated that Trp360 may undergo a conformational change after sugar donor binding to the enzyme. UGT85H2 has higher specificity for flavonol than for isoflavone. Further substrate docking combined with enzyme activity assay and kinetic analysis provided structural insights into this substrate specificity and preference.

  • Organizational Affiliation

    Plant Biology Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UDP-glucuronosyl/UDP-glucosyltransferase482Medicago truncatulaMutation(s): 0 
Find proteins for A6XNC5 (Medicago truncatula)
Explore A6XNC5 
Go to UniProtKB:  A6XNC5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA6XNC5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.997α = 90
b = 82.961β = 90
c = 95.411γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-10
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Refinement description