9C4P

Crystal structure of wild-type arabidopsis thaliana acetohydroxyacid synthase in complex with commercial herbicide triasulfuron


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.172 

Starting Model: experimental
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Ligand Structure Quality Assessment 


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Literature

Crystal Structures of Arabidopsis thaliana Acetohydroxyacid Synthase in Complex with the Herbicide Triasulfuron and Two Analogues with Herbicidal Activity in Field Trials.

Cheng, Y.Wang, Y.Lonhienne, T.Wang, J.G.Guddat, L.W.

(2024) J Agric Food Chem 

  • DOI: https://doi.org/10.1021/acs.jafc.4c04990
  • Primary Citation of Related Structures:  
    9C4P, 9C4Q, 9C4R

  • PubMed Abstract: 

    Triasulfuron is a commercial herbicide of the sulfonylurea family. This compound targets acetohydroxyacid synthase (AHAS, E.C. 2.2.1.6), the first enzyme in the branched chain amino acid biosynthesis pathway. Here, we have determined crystal structures of Arabidopsis thaliana AHAS ( At AHAS) in complex with triasulfuron and two newly designed herbicidal compounds, identified as FMO and CMO, showing that their binding modes are subtly different. Kinetic studies showed all three compounds exhibit varying K i values, 0.192 ± 0.013 μM for triasulfuron, 0.086 ± 0.013 μM for FMO, and 1.448 ± 0.058 μM for CMO, but all are strong time-dependent accumulative inhibitors of At AHAS. Apart from triasulfuron being a powerful herbicide with application rates of 10-15 g/ha in wheat fields, CMO and FMO are also herbicidal at 7.5-30 g/ha for barnyard grass. This study emphasizes that accumulative inhibition is an important factor that contributes to herbicidal activity.


  • Organizational Affiliation

    School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane 4072, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetolactate synthase, chloroplastic590Arabidopsis thalianaMutation(s): 0 
Gene Names: ALSAHASCSR1TZP5At3g48560T8P19.70ILVB
EC: 2.2.1.6
UniProt
Find proteins for P17597 (Arabidopsis thaliana)
Explore P17597 
Go to UniProtKB:  P17597
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP17597
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD (Subject of Investigation/LOI)
Query on FAD

Download Ideal Coordinates CCD File 
C [auth A]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
AUJ (Subject of Investigation/LOI)
Query on AUJ

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G [auth A]2-[3-[(4-azanyl-2-methyl-pyrimidin-5-yl)methyl]-2-[(1~{S})-1-(dioxidanyl)-1-oxidanyl-ethyl]-4-methyl-1,3-thiazol-5-yl]ethyl phosphono hydrogen phosphate
C14 H23 N4 O10 P2 S
IMARWCCDLODQKU-AWEZNQCLSA-N
A1AUE (Subject of Investigation/LOI)
Query on A1AUE

Download Ideal Coordinates CCD File 
E [auth A]2-(2-chloroethoxy)-N-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoyl]benzene-1-sulfonamide
C14 H16 Cl N5 O5 S
XOPFESVZMSQIKC-UHFFFAOYSA-N
NHE (Subject of Investigation/LOI)
Query on NHE

Download Ideal Coordinates CCD File 
D [auth A]2-[N-CYCLOHEXYLAMINO]ETHANE SULFONIC ACID
C8 H17 N O3 S
MKWKNSIESPFAQN-UHFFFAOYSA-N
SRT (Subject of Investigation/LOI)
Query on SRT

Download Ideal Coordinates CCD File 
F [auth A]S,R MESO-TARTARIC ACID
C4 H6 O6
FEWJPZIEWOKRBE-XIXRPRMCSA-N
SO4
Query on SO4

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I [auth A],
J [auth A],
K [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
MG
Query on MG

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B [auth A],
H [auth A]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CSD
Query on CSD
A
L-PEPTIDE LINKINGC3 H7 N O4 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.172 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 178.704α = 90
b = 178.704β = 90
c = 184.806γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Australian Research Council (ARC)Australia--

Revision History  (Full details and data files)

  • Version 1.0: 2024-10-23
    Type: Initial release