Crystal structure of E. coli aspartokinase III in complex with aspartate and ADP (R-state)

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.235 

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Structures of R- and T-State Escherichia Coli Aspartokinase III: Mechanisms of the Allosteric Transition and Inhibition by Lysine.

Kotaka, M.Ren, J.Lockyer, M.Hawkins, A.R.Stammers, D.K.

(2006) J Biol Chem 281: 31544

  • DOI: https://doi.org/10.1074/jbc.M605886200
  • Primary Citation of Related Structures:  
    2J0W, 2J0X

  • PubMed Abstract: 

    Aspartokinase III (AKIII) from Escherichia coli catalyzes an initial commitment step of the aspartate pathway, giving biosynthesis of certain amino acids including lysine. We report crystal structures of AKIII in the inactive T-state with bound feedback allosteric inhibitor lysine and in the R-state with aspartate and ADP. The structures reveal an unusual configuration for the regulatory ACT domains, in which ACT2 is inserted into ACT1 rather than the expected tandem repeat. Comparison of R- and T-state AKIII indicates that binding of lysine to the regulatory ACT1 domain in R-state AKIII instigates a series of changes that release a "latch", the beta15-alphaK loop, from the catalytic domain, which in turn undergoes large rotational rearrangements, promoting tetramer formation and completion of the transition to the T-state. Lysine-induced allosteric transition in AKIII involves both destabilizing the R-state and stabilizing the T-state tetramer. Rearrangement of the catalytic domain blocks the ATP-binding site, which is therefore the structural basis for allosteric inhibition of AKIII by lysine.

  • Organizational Affiliation

    Division of Structural Biology, The Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LYSINE-SENSITIVE ASPARTOKINASE 3449Escherichia coliMutation(s): 0 
Find proteins for P08660 (Escherichia coli (strain K12))
Explore P08660 
Go to UniProtKB:  P08660
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08660
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.235 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.535α = 90
b = 213.347β = 90
c = 93.078γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-10
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description