Structure of E. coli dihydrodipicolinate synthase bound with allosteric inhibitor (S)-lysine to 2.0 A

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 

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The crystal structures of native and (S)-lysine-bound dihydrodipicolinate synthase from Escherichia coli with improved resolution show new features of biological significance.

Dobson, R.C.Griffin, M.D.Jameson, G.B.Gerrard, J.A.

(2005) Acta Crystallogr D Biol Crystallogr 61: 1116-1124

  • DOI: https://doi.org/10.1107/S0907444905016318
  • Primary Citation of Related Structures:  
    1YXC, 1YXD

  • PubMed Abstract: 

    Dihydrodipicolinate synthase (DHDPS) mediates the key first reaction common to the biosynthesis of (S)-lysine and meso-diaminopimelate. The activity of DHDPS is allosterically regulated by the feedback inhibitor (S)-lysine. The crystal structure of DHDPS from Escherichia coli has previously been published, but to only a resolution of 2.5 A, and the structure of the lysine-bound adduct was known to only 2.94 A resolution. Here, the crystal structures of native and (S)-lysine-bound dihydrodipicolinate synthase from E. coli are presented to 1.9 and 2.0 A, respectively, resolutions that allow, in particular, more accurate definition of the protein structure. The general architecture of the active site is found to be consistent with previously determined structures, but with some important differences. Arg138, which is situated at the entrance of the active site and is thought to be involved in substrate binding, has an altered conformation and is connected via a water molecule to Tyr133 of the active-site catalytic triad. This suggests a hitherto unknown function for Arg138 in the DHDPS mechanism. Additionally, a re-evaluation of the dimer-dimer interface reveals a more extensive network of interactions than first thought. Of particular interest is the higher resolution structure of DHDPS with (S)-lysine bound at the allosteric site, which is remote to the active site, although connected to it by a chain of conserved water molecules. (S)-Lysine has a slightly altered conformation from that originally determined and does not appear to alter the DHDPS structure as others have reported.

  • Organizational Affiliation

    School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
dihydrodipicolinate synthase
A, B
292Escherichia coliMutation(s): 0 
Gene Names: DapA
Find proteins for P0A6L2 (Escherichia coli (strain K12))
Explore P0A6L2 
Go to UniProtKB:  P0A6L2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A6L2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.148α = 90
b = 121.148β = 90
c = 110.084γ = 120
Software Package:
Software NamePurpose
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references, Derived calculations