Neisseria meningitidis 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase regulated (Tryptophan)

Experimental Data Snapshot

  • Resolution: 2.23 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

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This is version 1.2 of the entry. See complete history


The Functional Unit of Neisseria meningitidis 3-Deoxy--Arabino-Heptulosonate 7-Phosphate Synthase Is Dimeric.

Cross, P.J.Heyes, L.C.Zhang, S.Nazmi, A.R.Parker, E.J.

(2016) PLoS One 11: e0145187-e0145187

  • DOI: https://doi.org/10.1371/journal.pone.0145187
  • Primary Citation of Related Structures:  
    4UCG, 5DCE

  • PubMed Abstract: 

    Neisseria meningitidis 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase (NmeDAH7PS) adopts a homotetrameric structure consisting of an extensive and a less extensive interface. Perturbation of the less extensive interface through a single mutation of a salt bridge (Arg126-Glu27) formed at the tetramer interface of all chains resulted in a dimeric DAH7PS in solution, as determined by small angle X-ray scattering, analytical ultracentrifugation and analytical size-exclusion chromatography. The dimeric NmeDAH7PSR126S variant was shown to be catalytically active in the aldol-like condensation reaction between D-erythrose 4-phosphate and phosphoenolpyruvate, and allosterically inhibited by L-phenylalanine to the same extent as the wild-type enzyme. The dimeric NmeDAH7PSR126S variant exhibited a slight reduction in thermal stability by differential scanning calorimetry experiments and a slow loss of activity over time compared to the wild-type enzyme. Although NmeDAH7PSR126S crystallised as a tetramer, like the wild-type enzyme, structural asymmetry at the less extensive interface was observed consistent with its destabilisation. The tetrameric association enabled by this Arg126-Glu27 salt-bridge appears to contribute solely to the stability of the protein, ultimately revealing that the functional unit of NmeDAH7PS is dimeric.

  • Organizational Affiliation

    Biomolecular Interaction Centre and Department of Chemistry, University of Canterbury, Christchurch, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phospho-2-dehydro-3-deoxyheptonate aldolase
A, B, C, D
351Neisseria meningitidis MC58Mutation(s): 0 
Gene Names: aroGNMB0307
Find proteins for Q9K169 (Neisseria meningitidis serogroup B (strain MC58))
Explore Q9K169 
Go to UniProtKB:  Q9K169
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9K169
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.23 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.432α = 90
b = 138.042β = 96.58
c = 75.868γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-24
    Type: Initial release
  • Version 1.1: 2016-10-05
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references, Derived calculations