3ECR

Structure of human porphobilinogen deaminase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.182 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural insight into acute intermittent porphyria.

Song, G.Li, Y.Cheng, C.Zhao, Y.Gao, A.Zhang, R.Joachimiak, A.Shaw, N.Liu, Z.J.

(2009) Faseb J. 23: 396-404

  • DOI: 10.1096/fj.08-115469

  • PubMed Abstract: 
  • Acute intermittent porphyria (AIP), an inherited disease of heme biosynthesis, is one of the most common types of porphyria. Reduced activity of the enzyme porphobilinogen deaminase (PBGD), which catalyzes the sequential condensation of 4 molecules o ...

    Acute intermittent porphyria (AIP), an inherited disease of heme biosynthesis, is one of the most common types of porphyria. Reduced activity of the enzyme porphobilinogen deaminase (PBGD), which catalyzes the sequential condensation of 4 molecules of porphobilinogen to yield preuroporphyrinogen, has been linked to the symptoms of AIP. We have determined the 3-dimensional structure of human PBGD at 2.2 A resolution. Analysis of the structure revealed a dipyrromethane cofactor molecule covalently linked to C261, sitting in a positively charged cleft region. In addition to the critical catalytic D99, a number of other residues are seen hydrogen bonded to the cofactor and play a role in catalysis. Sequential entry of 4 pyrrole molecules into the active site is accomplished by movement of the domains around the hinges. H120P mutation resulted in an inactive enzyme, supporting the role of H120 as a hinge residue. Interestingly, some of the mutations of the human PBGD documented in patients suffering from AIP are located far away from the active site. The structure provides insights into the mechanism of action of PBGD at the molecular level and could aid the development of potential drugs for the up-regulation of PBGD activity in AIP.


    Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, 15 Datun Lu, Beijing 100101, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Porphobilinogen deaminase
A, B
364Homo sapiensGene Names: HMBS (PBGD, UPS)
EC: 2.5.1.61
Find proteins for P08397 (Homo sapiens)
Go to Gene View: HMBS
Go to UniProtKB:  P08397
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DPM
Query on DPM

Download SDF File 
Download CCD File 
A, B
3-[5-{[3-(2-carboxyethyl)-4-(carboxymethyl)-5-methyl-1H-pyrrol-2-yl]methyl}-4-(carboxymethyl)-1H-pyrrol-3-yl]propanoic acid
DIPYRROMETHANE COFACTOR
C20 H24 N2 O8
LCAXMKQKEYTFDM-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.182 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.232 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 71.610α = 90.00
b = 81.061β = 90.00
c = 109.211γ = 90.00
Software Package:
Software NamePurpose
PHENIXmodel building
HKL-2000data reduction
PHENIXphasing
PHENIXrefinement
HKL-2000data collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-09-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance