6VZ8

Arabidopsis thaliana acetohydroxyacid synthase complex with valine bound

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.45 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 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: 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 ...

    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. luke.guddat@uq.edu.au.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acetolactate synthase, chloroplastic586Arabidopsis thalianaMutation(s): 0 
Gene Names: ALS, AHAS, CSR1, TZP5, At3g48560, T8P19.70
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
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Acetolactate synthase small subunit 2, chloroplastic491Arabidopsis thalianaMutation(s): 0 
Gene Names: At2g31810, F20M17.15
UniProt
Find proteins for Q93YZ7 (Arabidopsis thaliana)
Explore Q93YZ7 
Go to UniProtKB:  Q93YZ7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ93YZ7
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD
Download Ideal Coordinates CCD File 
CA [auth I],
HA [auth L],
KA [auth M],
PA [auth P],
R [auth D],
CA [auth I],
HA [auth L],
KA [auth M],
PA [auth P],
R [auth D],
SA [auth Q],
U [auth E],
Z [auth H]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N		 Ligand Interaction
TPP
Query on TPP
Download Ideal Coordinates CCD File 
AA [auth H],
DA [auth I],
IA [auth L],
LA [auth M],
QA [auth P],
AA [auth H],
DA [auth I],
IA [auth L],
LA [auth M],
QA [auth P],
S [auth D],
TA [auth Q],
V [auth E]
THIAMINE DIPHOSPHATE
C12 H19 N4 O7 P2 S
AYEKOFBPNLCAJY-UHFFFAOYSA-O		 Ligand Interaction
VAL (Subject of Investigation/LOI)
Query on VAL
Download Ideal Coordinates CCD File 
EA [auth J],
FA [auth K],
MA [auth N],
NA [auth O],
UA [auth R],
EA [auth J],
FA [auth K],
MA [auth N],
NA [auth O],
UA [auth R],
VA [auth S],
W [auth F],
X [auth G]
VALINE
C5 H11 N O2
KZSNJWFQEVHDMF-BYPYZUCNSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
BA [auth I],
GA [auth L],
JA [auth M],
OA [auth P],
Q [auth D],
BA [auth I],
GA [auth L],
JA [auth M],
OA [auth P],
Q [auth D],
RA [auth Q],
T [auth E],
Y [auth H]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.45 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)Australia1087713
National Health and Medical Research Council (NHMRC, Australia)Australia1147297

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-15
    Type: Initial release
  • Version 1.1: 2021-01-27
    Changes: Database references, Derived calculations