2CDQ

Crystal structure of Arabidopsis thaliana aspartate kinase complexed with lysine and S- adenosylmethionine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A Novel Organization of Act Domains in Allosteric Enzymes Revealed by the Crystal Structure of Arabidopsis Aspartate Kinase

Mas-Droux, C.Curien, G.Robert-Genthon, M.Laurencin, M.Ferrer, J.L.Dumas, R.

(2006) Plant Cell 18: 1681

  • DOI: 10.1105/tpc.105.040451

  • PubMed Abstract: 
  • Asp kinase catalyzes the first step of the Asp-derived essential amino acid pathway in plants and microorganisms. Depending on the source organism, this enzyme contains up to four regulatory ACT domains and exhibits several isoforms under the control ...

    Asp kinase catalyzes the first step of the Asp-derived essential amino acid pathway in plants and microorganisms. Depending on the source organism, this enzyme contains up to four regulatory ACT domains and exhibits several isoforms under the control of a great variety of allosteric effectors. We report here the dimeric structure of a Lys and S-adenosylmethionine-sensitive Asp kinase isoform from Arabidopsis thaliana in complex with its two inhibitors. This work reveals the structure of an Asp kinase and an enzyme containing two ACT domains cocrystallized with its effectors. Only one ACT domain (ACT1) is implicated in effector binding. A loop involved in the binding of Lys and S-adenosylmethionine provides an explanation for the synergistic inhibition by these effectors. The presence of S-adenosylmethionine in the regulatory domain indicates that ACT domains are also able to bind nucleotides. The organization of ACT domains in the present structure is different from that observed in Thr deaminase and in the regulatory subunit of acetohydroxyacid synthase III.


    Organizational Affiliation

    Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Université Joseph Fourier, Commissariat à l'Energie Atomique, Département Réponse et Dynamique Cellulaires, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ASPARTOKINASE
A, B
510Arabidopsis thalianaGene Names: AK1 (AK, AK-LYS1)
EC: 2.7.2.4
Find proteins for Q9LYU8 (Arabidopsis thaliana)
Go to Gene View: AK1
Go to UniProtKB:  Q9LYU8
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TAR
Query on TAR

Download SDF File 
Download CCD File 
A, B
D(-)-TARTARIC ACID
C4 H6 O6
FEWJPZIEWOKRBE-LWMBPPNESA-N
 Ligand Interaction
LYS
Query on LYS

Download SDF File 
Download CCD File 
A, B
LYSINE
C6 H15 N2 O2
KDXKERNSBIXSRK-YFKPBYRVSA-O
 Ligand Interaction
SAM
Query on SAM

Download SDF File 
Download CCD File 
A, B
S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.202 
  • Space Group: I 41
Unit Cell:
Length (Å)Angle (°)
a = 117.342α = 90.00
b = 117.342β = 90.00
c = 255.283γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
SCALAdata scaling
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-05-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance