Crystal Structure of F. graminearum TRI101 complexed with Coenzyme A and T-2 mycotoxin

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 

Starting Model: experimental
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Structural and Functional Characterization of the TRI101 Trichothecene 3-O-Acetyltransferase from Fusarium sporotrichioides and Fusarium graminearum: KINETIC INSIGHTS TO COMBATING FUSARIUM HEAD BLIGHT

Garvey, G.S.McCormick, S.P.Rayment, I.

(2008) J Biol Chem 283: 1660-1669

  • DOI: https://doi.org/10.1074/jbc.M705752200
  • Primary Citation of Related Structures:  
    2RKT, 2RKV, 2ZBA, 3B2S, 3B30

  • PubMed Abstract: 

    Fusarium head blight (FHB) is a plant disease with serious economic and health impacts. It is caused by fungal species belonging to the genus Fusarium and the mycotoxins they produce. Although it has proved difficult to combat this disease, one strategy that has been examined is the introduction of an indigenous fungal protective gene into cereals such as wheat barley and rice. Thus far the gene of choice has been tri101 whose gene product catalyzes the transfer of an acetyl group from acetyl coenzyme A to the C3 hydroxyl moiety of several trichothecene mycotoxins. In vitro this has been shown to reduce the toxicity of the toxins by approximately 100-fold but has demonstrated limited resistance to FHB in transgenic cereal. To understand the molecular basis for the differences between in vitro and in vivo resistance the three-dimensional structures and kinetic properties of two TRI101 orthologs isolated from Fusarium sporotrichioides and Fusarium graminearum have been determined. The kinetic results reveal important differences in activity of these enzymes toward B-type trichothecenes such as deoxynivalenol. These differences in activity can be explained in part by the three-dimensional structures for the ternary complexes for both of these enzymes with coenzyme A and trichothecene mycotoxins. The structural and kinetic results together emphasize that the choice of an enzymatic resistance gene in transgenic crop protection strategies must take into account the kinetic profile of the selected protein.

  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Trichothecene 3-O-acetyltransferase451Fusarium graminearumMutation(s): 0 
Gene Names: tri101
Find proteins for O42692 (Gibberella zeae)
Explore O42692 
Go to UniProtKB:  O42692
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO42692
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on COA

Download Ideal Coordinates CCD File 
C21 H36 N7 O16 P3 S
Query on ZBA

Download Ideal Coordinates CCD File 
D [auth A]12,13-Epoxytrichothec-9-ene-3,4,8,15-tetrol-4,15-diacetate-8-isovalerate
C24 H32 O9
Query on MPO

Download Ideal Coordinates CCD File 
C7 H15 N O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 123.113α = 90
b = 123.113β = 90
c = 81.27γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2016-12-21
    Changes: Structure summary
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description