3E9Y

Arabidopsis thaliana acetohydroxyacid synthase in complex with monosulfuron


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structures of two novel sulfonylurea herbicides in complex with Arabidopsis thaliana acetohydroxyacid synthase.

Wang, J.-G.Lee, P.K.Dong, Y.-H.Pang, S.S.Duggleby, R.G.Li, Z.-M.Guddat, L.W.

(2009) Febs J. 276: 1282-1290

  • DOI: 10.1111/j.1742-4658.2009.06863.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Acetohydroxyacid synthase (AHAS; EC 2.2.1.6) is the first enzyme in the biosynthetic pathway of the branched-chain amino acids. It catalyzes the conversion of two molecules of pyruvate into 2-acetolactate or one molecule of pyruvate and one molecule ...

    Acetohydroxyacid synthase (AHAS; EC 2.2.1.6) is the first enzyme in the biosynthetic pathway of the branched-chain amino acids. It catalyzes the conversion of two molecules of pyruvate into 2-acetolactate or one molecule of pyruvate and one molecule of 2-ketobutyrate into 2-aceto-2-hydroxybutyrate. AHAS requires the cofactors thiamine diphosphate (ThDP), Mg(2+) and FAD for activity. The herbicides that target this enzyme are effective in protecting a broad range of crops from weed species. However, resistance in the field is now a serious problem worldwide. To address this, two new sulfonylureas, monosulfuron and monosulfuron ester, have been developed as commercial herbicides in China. These molecules differ from the traditional sulfonylureas in that the heterocyclic ring attached to the nitrogen atom of the sulfonylurea bridge is monosubstituted rather than disubstituted. The structures of these compounds in complex with the catalytic subunit of Arabidopsis thaliana AHAS have been determined to 3.0 and 2.8 A, respectively. In both complexes, these molecules are bound in the tunnel leading to the active site, such that the sole substituent of the heterocyclic ring is buried deepest and oriented towards the ThDP. Unlike the structures of Arabidopsis thaliana AHAS in complex with the classic disubstituted sulfonylureas, where ThDP is broken, this cofactor is intact and present most likely as the hydroxylethyl intermediate.


    Organizational Affiliation

    State Key Laboratory of Elemento-Organic Chemistry, National Pesticide Engineering Research Center, Nankai University, Tianjin, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acetolactate synthase, chloroplastic
A
584Arabidopsis thalianaMutation(s): 0 
Gene Names: ALS (AHAS, CSR1, TZP5)
EC: 2.2.1.6
Find proteins for P17597 (Arabidopsis thaliana)
Go to UniProtKB:  P17597
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1MS
Query on 1MS

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Download CCD File 
A
N-[(4-methylpyrimidin-2-yl)carbamoyl]-2-nitrobenzenesulfonamide
C12 H11 N5 O5 S
DPIRXVCCFDCYGI-UHFFFAOYSA-N
 Ligand Interaction
FAB
Query on FAB

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Download CCD File 
A
FLAVIN-ADENINE DINUCLEOTIDE-N5-ISOBUTYL KETONE
C31 H39 N9 O16 P2
VVZGWZAMSAFRNS-UYOVOMPXSA-N
 Ligand Interaction
NHE
Query on NHE

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Download CCD File 
A
2-[N-CYCLOHEXYLAMINO]ETHANE SULFONIC ACID
N-CYCLOHEXYLTAURINE; CHES
C8 H17 N O3 S
MKWKNSIESPFAQN-UHFFFAOYSA-N
 Ligand Interaction
TDM
Query on TDM

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Download CCD File 
A
2-[(2E)-3-[(4-AMINO-2-METHYLPYRIMIDIN-5-YL)METHYL]-2-(1-HYDROXYETHYLIDENE)-4-METHYL-2,3-DIHYDRO-1,3-THIAZOL-5-YL]ETHYL TRIHYDROGEN DIPHOSPHATE
2-HYDROXYETHYLTHIAMIN DIPHOSPHATE
C14 H22 N4 O8 P2 S
ZZLCKFKIIVXBQU-NTEUORMPSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSD
Query on CSD
A
L-PEPTIDE LINKINGC3 H7 N O4 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.192 
  • Space Group: P 64 2 2
Unit Cell:
Length (Å)Angle (°)
a = 178.866α = 90.00
b = 178.866β = 90.00
c = 186.078γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
ADSCdata collection
CCP4phasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2014-11-12
    Type: Non-polymer description