1R3R

Uroporphyrinogen Decarboxylase with mutation D86N


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for tetrapyrrole coordination by uroporphyrinogen decarboxylase

Phillips, J.D.Whitby, F.G.Kushner, J.P.Hill, C.P.

(2003) EMBO J 22: 6225-6233

  • DOI: 10.1093/emboj/cdg606
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Uroporphyrinogen decarboxylase (URO-D), an essential enzyme that functions in the heme biosynthetic pathway, catalyzes decarboxylation of all four acetate groups of uroporphyrinogen to form coproporphyrinogen. Here we report crystal structures of URO ...

    Uroporphyrinogen decarboxylase (URO-D), an essential enzyme that functions in the heme biosynthetic pathway, catalyzes decarboxylation of all four acetate groups of uroporphyrinogen to form coproporphyrinogen. Here we report crystal structures of URO-D in complex with the I and III isomer coproporphyrinogen products. Crystallization required use of a novel enzymatic approach to generate the highly oxygen-sensitive porphyrinogen substrate in situ. The tetrapyrrole product adopts a domed conformation that lies against a collar of conserved hydrophobic residues and allows formation of hydrogen bonding interactions between a carboxylate oxygen atom of the invariant Asp86 residue and the pyrrole NH groups. Structural and biochemical analyses of URO-D proteins mutated at Asp86 support the conclusion that this residue makes important contributions to binding and likely promotes catalysis by stabilizing a positive charge on a reaction intermediate. The central coordination geometry of Asp86 allows the initial substrates and the various partially decarboxylated intermediates to be bound with equivalent activating interactions, and thereby explains how all four of the substrate acetate groups can be decarboxylated at the same catalytic center.


    Organizational Affiliation

    Department of Medicine, University of Utah School of Medicine, Salt Lake City, UT 84132, USA. john.phillips@hsc.utah.edu



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uroporphyrinogen DecarboxylaseA367Homo sapiensMutation(s): 1 
Gene Names: UROD
EC: 4.1.1.37
Find proteins for P06132 (Homo sapiens)
Explore P06132 
Go to UniProtKB:  P06132
NIH Common Fund Data Resources
PHAROS  P06132
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.735α = 90
b = 102.735β = 90
c = 73.426γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-12-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance