6WO1

Hybrid acetohydroxyacid synthase complex structure with Cryptococcus neoformans AHAS catalytic subunit and Saccharomyces cerevisiae AHAS regulatory subunit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.216 

Starting Models: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structures of fungal and plant acetohydroxyacid synthases.

Lonhienne, T.Low, Y.S.Garcia, M.D.Croll, T.Gao, Y.Wang, Q.Brillault, L.Williams, C.M.Fraser, J.A.McGeary, R.P.West, N.P.Landsberg, M.J.Rao, Z.Schenk, G.Guddat, L.W.

(2020) Nature 586: 317-321

  • DOI: https://doi.org/10.1038/s41586-020-2514-3
  • Primary Citation of Related Structures:  
    6U9D, 6U9H, 6VZ8, 6WO1

  • PubMed Abstract: 

    Acetohydroxyacid synthase (AHAS), also known as acetolactate synthase, is a flavin adenine dinucleotide-, thiamine diphosphate- and magnesium-dependent enzyme that catalyses the first step in the biosynthesis of branched-chain amino acids 1 . It is the target for more than 50 commercial herbicides 2 . AHAS requires both catalytic and regulatory subunits for maximal activity and functionality. Here we describe structures of the hexadecameric AHAS complexes of Saccharomyces cerevisiae and dodecameric AHAS complexes of Arabidopsis thaliana. We found that the regulatory subunits of these AHAS complexes form a core to which the catalytic subunit dimers are attached, adopting the shape of a Maltese cross. The structures show how the catalytic and regulatory subunits communicate with each other to provide a pathway for activation and for feedback inhibition by branched-chain amino acids. We also show that the AHAS complex of Mycobacterium tuberculosis adopts a similar structure, thus demonstrating that the overall AHAS architecture is conserved across kingdoms.


  • Organizational Affiliation

    School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia. t.lonhienne@uq.edu.au.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetohydroxyacid synthase catalytic subunit718Cryptococcus neoformansMutation(s): 0 
EC: 2.2.1.6
UniProt
Find proteins for Q96VZ6 (Cryptococcus neoformans)
Explore Q96VZ6 
Go to UniProtKB:  Q96VZ6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96VZ6
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Acetohydroxyacid synthase regulatory subunit309Saccharomyces cerevisiaeMutation(s): 0 
UniProt
Find proteins for P25605 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P25605 
Go to UniProtKB:  P25605
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP25605
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 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
DPO (Subject of Investigation/LOI)
Query on DPO

Download Ideal Coordinates CCD File 
E [auth A]DIPHOSPHATE
O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-J
VAL (Subject of Investigation/LOI)
Query on VAL

Download Ideal Coordinates CCD File 
G [auth B]VALINE
C5 H11 N O2
KZSNJWFQEVHDMF-BYPYZUCNSA-N
8GF (Subject of Investigation/LOI)
Query on 8GF

Download Ideal Coordinates CCD File 
D [auth A]2-methylpyrimidin-4-amine
C5 H7 N3
GKVDLTTVBNOGNJ-UHFFFAOYSA-N
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
F [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.216 
  • Space Group: P 4 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 195.679α = 90
b = 195.679β = 90
c = 195.679γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)AustraliaGrant numbers 1087713 & 1147297

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-15
    Type: Initial release
  • Version 1.1: 2020-07-22
    Changes: Database references
  • Version 1.2: 2020-10-21
    Changes: Database references
  • Version 1.3: 2021-01-27
    Changes: Database references
  • Version 1.4: 2023-10-18
    Changes: Data collection, Database references, Refinement description