8ET4

Crystal structure of wild-type arabidopsis thaliana acetohydroxyacid synthase in complex with amidosulfuron


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Crystal Structure of the Commercial Herbicide, Amidosulfuron, in Complex with Arabidopsis thaliana Acetohydroxyacid Synthase.

Cheng, Y.Lonhienne, T.Garcia, M.D.Williams, C.M.Schenk, G.Guddat, L.W.

(2023) J Agric Food Chem 71: 5117-5126

  • DOI: https://doi.org/10.1021/acs.jafc.2c08528
  • Primary Citation of Related Structures:  
    8ET4, 8ET5

  • PubMed Abstract: 

    Amidosulfuron (AS) is from the commercial sulfonylurea herbicide family. It is highly effective against dicot broad-leaf weeds. This herbicide targets acetohydroxyacid synthase (AHAS), the first enzyme in the branched chain amino acid biosynthesis pathway. Here, we have determined the crystal structure of AS in complex with wildtype Arabidopsis thaliana AHAS ( At AHAS) and with the resistance mutant, S653T. In both structures, the cofactor, ThDP, is modified to a peracetate adduct, consistent with time-dependent accumulative inhibition. Compared to other AHAS-inhibiting herbicides of the sulfonylurea family, AS lacks a second aromatic ring. The replacement is an aryl sulfonyl group with a reduced number of interactions with the enzyme and relatively low affinity ( K i = 4.2 μM vs low nM when two heteroaromatic rings are present). This study shows that effective herbicides can have a relatively high K i for plant AHAS but can still be a potent herbicide provided accumulative inhibition also occurs.


  • 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
Query on FAD

Download Ideal Coordinates CCD File 
C [auth A]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
AUJ
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
WRQ
Query on WRQ

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D [auth A]N-{[(4,6-dimethoxypyrimidin-2-yl)carbamoyl]sulfamoyl}-N-methylmethanesulfonamide
C9 H15 N5 O7 S2
CTTHWASMBLQOFR-UHFFFAOYSA-N
NHE
Query on NHE

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F [auth A]2-[N-CYCLOHEXYLAMINO]ETHANE SULFONIC ACID
C8 H17 N O3 S
MKWKNSIESPFAQN-UHFFFAOYSA-N
TLA
Query on TLA

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E [auth A]L(+)-TARTARIC ACID
C4 H6 O6
FEWJPZIEWOKRBE-JCYAYHJZSA-N
SO4
Query on SO4

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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],
I [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: 2.95 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 179.026α = 90
b = 179.026β = 90
c = 185.032γ = 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: 2023-03-29
    Type: Initial release
  • Version 1.1: 2023-04-19
    Changes: Database references
  • Version 1.2: 2023-10-25
    Changes: Data collection, Refinement description
  • Version 1.3: 2024-10-16
    Changes: Structure summary