1GZG

Complex of a Mg2-dependent porphobilinogen synthase from Pseudomonas aeruginosa (mutant D139N) with 5-fluorolevulinic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

Structure of porphobilinogen synthase from Pseudomonas aeruginosa in complex with 5-fluorolevulinic acid suggests a double Schiff base mechanism.

Frere, F.Schubert, W.D.Stauffer, F.Frankenberg, N.Neier, R.Jahn, D.Heinz, D.W.

(2002) J. Mol. Biol. 320: 237-247

  • DOI: 10.1016/S0022-2836(02)00472-2

  • PubMed Abstract: 
  • All natural tetrapyrroles, including hemes, chlorophylls and vitamin B12, share porphobilinogen (PBG) as a common precursor. Porphobilinogen synthase (PBGS) synthesizes PBG through the asymmetric condensation of two molecules of aminolevulinic acid ( ...

    All natural tetrapyrroles, including hemes, chlorophylls and vitamin B12, share porphobilinogen (PBG) as a common precursor. Porphobilinogen synthase (PBGS) synthesizes PBG through the asymmetric condensation of two molecules of aminolevulinic acid (ALA). Crystal structures of PBGS from various sources confirm the presence of two distinct binding sites for each ALA molecule, termed A and P. We have solved the structure of the active-site variant D139N of the Mg2+-dependent PBGS from Pseudomonas aeruginosa in complex with the inhibitor 5-fluorolevulinic acid at high resolution. Uniquely, full occupancy of both substrate binding sites each by a single substrate-like molecule was observed. Both inhibitor molecules are covalently bound to two conserved, active-site lysine residues, Lys205 and Lys260, through Schiff bases. The active site now also contains a monovalent cation that may critically enhance enzymatic activity. Based on these structural data, we postulate a catalytic mechanism for P. aeruginosa PBGS initiated by a C-C bond formation between A and P-side ALA, followed by the formation of the intersubstrate Schiff base yielding the product PBG.


    Organizational Affiliation

    Institute of Microbiology, Technical University Braunschweig, Spielmannstrasse 7, D-38106 Braunschweig, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DELTA-AMINOLEVULINIC ACID DEHYDRATASE
A, B
337Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)Mutation(s): 1 
Gene Names: hemB
EC: 4.2.1.24
Find proteins for Q59643 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  Q59643
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

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B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MG
Query on MG

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A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
LAF
Query on LAF

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A, B
5-FLUOROLEVULINIC ACID
C5 H7 F O3
MBVLGMJBSFUHKW-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
LAFIC50: 900000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.175 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 127.131α = 90.00
b = 127.131β = 90.00
c = 86.145γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACrefinement
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-06-27
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 2.0: 2018-11-21
    Type: Atomic model, Data collection, Database references, Derived calculations, Structure summary