3B8I

Crystal Structure of Oxaloacetate Decarboxylase from Pseudomonas Aeruginosa (PA4872) in complex with oxalate and Mg2+.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Structure and function of PA4872 from Pseudomonas aeruginosa, a novel class of oxaloacetate decarboxylase from the PEP mutase/isocitrate lyase superfamily.

Narayanan, B.C., Niu, W., Han, Y., Zou, J., Mariano, P.S., Dunaway-Mariano, D., Herzberg, O.

(2008) Biochemistry 47: 167-182

  • DOI: 10.1021/bi701954p
  • Primary Citation of Related Structures:  
    3B8I

  • PubMed Abstract: 

    • Pseudomonas aeruginosa PA4872 was identified by sequence analysis as a structurally and functionally novel member of the PEP mutase/isocitrate lyase superfamily and therefore targeted for investigation. Substrate screens ruled out overlap with known catalytic functions of superfamily members ...

    Pseudomonas aeruginosa PA4872 was identified by sequence analysis as a structurally and functionally novel member of the PEP mutase/isocitrate lyase superfamily and therefore targeted for investigation. Substrate screens ruled out overlap with known catalytic functions of superfamily members. The crystal structure of PA4872 in complex with oxalate (a stable analogue of the shared family alpha-oxyanion carboxylate intermediate/transition state) and Mg2+ was determined at 1.9 A resolution. As with other PEP mutase/isocitrate lyase superfamily members, the protein assembles into a dimer of dimers with each subunit adopting an alpha/beta barrel fold and two subunits swapping their barrel's C-terminal alpha-helices. Mg2+ and oxalate bind in the same manner as observed with other superfamily members. The active site gating loop, known to play a catalytic role in the PEP mutase and lyase branches of the superfamily, adopts an open conformation. The Nepsilon of His235, an invariant residue in the PA4872 sequence family, is oriented toward a C(2) oxygen of oxalate analogous to the C(3) of a pyruvyl moiety. Deuterium exchange into alpha-oxocarboxylate-containing compounds was confirmed by 1H NMR spectroscopy. Having ruled out known activities, the involvement of a pyruvate enolate intermediate suggested a decarboxylase activity of an alpha-oxocarboxylate substrate. Enzymatic assays led to the discovery that PA4872 decarboxylates oxaloacetate (kcat = 7500 s(-1) and Km = 2.2 mM) and 3-methyloxaloacetate (kcat = 250 s(-1) and Km = 0.63 mM). Genome context of the fourteen sequence family members indicates that the enzyme is used by select group of Gram-negative bacteria to maintain cellular concentrations of bicarbonate and pyruvate; however the decarboxylation activity cannot be attributed to a pathway common to the various bacterial species.

    Organizational Affiliation: 

    Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, Rockville, Maryland 20850, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PA4872 oxaloacetate decarboxylaseA, B, C, D, E, F287Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: Dnase1, PA4872
EC: 4.1.1.3 (PDB Primary Data), 4.1.1.112 (UniProt)
Find proteins for Q9HUU1 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HUU1 
Go to UniProtKB:  Q9HUU1
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL
Download Ideal Coordinates CCD File 
 I [auth A], J [auth A], M [auth B], N [auth B], S [auth D], V [auth E], W [auth E], Z [auth F]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
OXL
Query on OXL
Download Ideal Coordinates CCD File 
 H [auth A], L [auth B], P [auth C], R [auth D], U [auth E], Y [auth F]OXALATE ION
C2 O4
MUBZPKHOEPUJKR-UHFFFAOYSA-L		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
 G [auth A], K [auth B], O [auth C], Q [auth D], T [auth E], X [auth F]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
OXLKi:  4000   nM  Binding MOAD
OXLKi:  43000   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.197 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 260.065α = 90
b = 83.835β = 112.14
c = 104.874γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrystalCleardata collection
CrystalCleardata reduction
CrystalCleardata scaling
MLPHAREphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-01-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2018-01-24
    Changes: Structure summary