4JTJ

Crystal structure of R117K mutant of 3-deoxy-D-manno-octulosonate 8-phosphate synthase (KDO8PS) from Neisseria meningitidis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Examining the Role of Intersubunit Contacts in Catalysis by 3-Deoxy-d-manno-octulosonate 8-Phosphate Synthase.

Allison, T.M.Cochrane, F.C.Jameson, G.B.Parker, E.J.

(2013) Biochemistry 52: 4676-4686

  • DOI: 10.1021/bi400521f
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • 3-Deoxy-d-manno-octulosonate 8-phosphate synthase (KDO8PS) catalyzes the reaction between phosphoenolpyruvate and arabinose 5-phosphate (A5P) in the first committed step in the pathway to 3-deoxy-d-manno-octulosonate, a component in the cell wall of ...

    3-Deoxy-d-manno-octulosonate 8-phosphate synthase (KDO8PS) catalyzes the reaction between phosphoenolpyruvate and arabinose 5-phosphate (A5P) in the first committed step in the pathway to 3-deoxy-d-manno-octulosonate, a component in the cell wall of Gram-negative bacteria. KDO8PS is evolutionarily and structurally related to the first enzyme of the shikimate pathway, 3-deoxy-d-arabino-heptulosonate 7-phosphate synthase (DAH7PS), which uses erythrose 4-phosphate in place of A5P. Both KDO8PS and type Iβ DAH7PS enzymes adopt similar homotetrameric associations with their active sites close to one of the interfaces. The conserved PAFLxR motif in KDO8PS and the corresponding GARNxQ motif in type Iβ DAH7PS, both on the short β4-α4 loop of the (β/α)8 barrel, form part of this interface and provide key contacts with substrates. This (112)PAFLxR(117) motif was mutated in Neisseria meningitidis KDO8PS in order to assess its role in enzyme function. Arg117 extends across the interface to provide guanidinium functionality in the A5P binding site of the adjacent subunit. Substitution Arg117Ala severely hampered catalysis, whereas substitution to Lys was tolerated better. Mutation of Phe114 to either Arg or Ala results in active proteins, but with substantially elevated Km(A5P) values. Mutant proteins that combine substitutions in this motif demonstrate poor catalytic function, and, although these mutated residues now structurally resemble their counterparts in the GARNxQ motif of type Iβ DAH7PS, no DAH7PS-like activity was observed. Analysis of the structures reveals that small changes in relative orientation of the subunits are important for the differences in active-site construction. Quaternary structure is therefore tightly linked to substrate specificity.


    Organizational Affiliation

    Institute of Fundamental Sciences, Massey University , Palmerston North, New Zealand.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
2-dehydro-3-deoxyphosphooctonate aldolase
A, B, C, D
280Neisseria meningitidis serogroup B (strain MC58)Mutation(s): 1 
Gene Names: kdsA
EC: 2.5.1.55
Find proteins for Q9JZ55 (Neisseria meningitidis serogroup B (strain MC58))
Go to UniProtKB:  Q9JZ55
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
C
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, C, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 81.468α = 90.00
b = 85.370β = 90.00
c = 163.023γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata scaling
PDB_EXTRACTdata extraction
d*TREKdata reduction
CrystalCleardata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-07-10
    Type: Database references
  • Version 1.2: 2013-12-18
    Type: Database references