7U1U

Crystal structure of arabidopsis thaliana acetohydroxyacid synthase W574L mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.22 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structural basis of resistance to herbicides that target acetohydroxyacid synthase.

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

(2022) Nat Commun 13: 3368-3368

  • DOI: https://doi.org/10.1038/s41467-022-31023-x
  • Primary Citation of Related Structures:  
    7STQ, 7TZZ, 7U1D, 7U1U, 7U25

  • PubMed Abstract: 

    Acetohydroxyacid synthase (AHAS) is the target for more than 50 commercial herbicides; first applied to crops in the 1980s. Since then, 197 site-of-action resistance isolates have been identified in weeds, with mutations at P197 and W574 the most prevalent. Consequently, AHAS is at risk of not being a useful target for crop protection. To develop new herbicides, a functional understanding to explain the effect these mutations have on activity is required. Here, we show that these mutations can have two effects (i) to reduce binding affinity of the herbicides and (ii) to abolish time-dependent accumulative inhibition, critical to the exceptional effectiveness of this class of herbicide. In the two mutants, conformational changes occur resulting in a loss of accumulative inhibition by most herbicides. However, bispyribac, a bulky herbicide is able to counteract the detrimental effects of these mutations, explaining why no site-of-action resistance has yet been reported for this herbicide.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetolactate synthase, chloroplastic590Arabidopsis thalianaMutation(s): 1 
Gene Names: ALSAHASCSR1TZP5At3g48560T8P19.70
EC: 2.2.1.6
UniProt
Find proteins for P17597 (Arabidopsis thaliana)
Go to UniProtKB:  P17597
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
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: 3.22 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 177.953α = 90
b = 177.953β = 90
c = 184.727γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
XDSdata reduction
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: 2022-06-01
    Type: Initial release
  • Version 1.1: 2022-08-24
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description