7AAJ

Human porphobilinogen deaminase in complex with cofactor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.251 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Characterization of porphobilinogen deaminase mutants reveals that arginine-173 is crucial for polypyrrole elongation mechanism.

Bustad, H.J.Kallio, J.P.Laitaoja, M.Toska, K.Kursula, I.Martinez, A.Janis, J.

(2021) iScience 24: 102152-102152

  • DOI: https://doi.org/10.1016/j.isci.2021.102152
  • Primary Citation of Related Structures:  
    7AAJ, 7AAK

  • PubMed Abstract: 

    Porphobilinogen deaminase (PBGD), the third enzyme in the heme biosynthesis, catalyzes the sequential coupling of four porphobilinogen (PBG) molecules into a heme precursor. Mutations in PBGD are associated with acute intermittent porphyria (AIP), a rare metabolic disorder. We used Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to demonstrate that wild-type PBGD and AIP-associated mutant R167W both existed as holoenzymes (E holo ) covalently attached to the dipyrromethane cofactor, and three intermediate complexes, ES, ES 2 , and ES 3 , where S represents PBG. In contrast, only ES 2 was detected in AIP-associated mutant R173W, indicating that the formation of ES 3 is inhibited. The R173W crystal structure in the ES 2 -state revealed major rearrangements of the loops around the active site, compared to wild-type PBGD in the E holo -state. These results contribute to elucidating the structural pathogenesis of two common AIP-associated mutations and reveal the important structural role of Arg173 in the polypyrrole elongation mechanism.


  • Organizational Affiliation

    Department of Biomedicine, University of Bergen, Jonas Lies vei 91, 5009 Bergen, Norway.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Porphobilinogen deaminaseA [auth B],
B [auth A]
363Homo sapiensMutation(s): 0 
Gene Names: HMBSPBGDUPS
EC: 2.5.1.61
UniProt & NIH Common Fund Data Resources
Find proteins for P08397 (Homo sapiens)
Explore P08397 
Go to UniProtKB:  P08397
PHAROS:  P08397
GTEx:  ENSG00000256269 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08397
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.251 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.163α = 90
b = 84.608β = 90
c = 108.913γ = 90
Software Package:
Software NamePurpose
XDSdata processing
XDSdata reduction
Aimlessdata scaling
PHASERphasing
PHENIXrefinement
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-02-17
    Type: Initial release
  • Version 1.1: 2021-03-17
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Database references, Refinement description