3GVR

Single-chain UROD Y164G (GY) mutation

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


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

Literature

Substrate shuttling between active sites of uroporphyrinogen decarboxylase is not required to generate coproporphyrinogen.

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

(2009) J.Mol.Biol. 389: 306-314

  • DOI: 10.1016/j.jmb.2009.04.013
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Uroporphyrinogen decarboxylase (URO-D; EC 4.1.1.37), the fifth enzyme of the heme biosynthetic pathway, is required for the production of heme, vitamin B12, siroheme, and chlorophyll precursors. URO-D catalyzes the sequential decarboxylation of four ...

    Uroporphyrinogen decarboxylase (URO-D; EC 4.1.1.37), the fifth enzyme of the heme biosynthetic pathway, is required for the production of heme, vitamin B12, siroheme, and chlorophyll precursors. URO-D catalyzes the sequential decarboxylation of four acetate side chains in the pyrrole groups of uroporphyrinogen to produce coproporphyrinogen. URO-D is a stable homodimer, with the active-site clefts of the two subunits adjacent to each other. It has been hypothesized that the two catalytic centers interact functionally, perhaps by shuttling of reaction intermediates between subunits. We tested this hypothesis by construction of a single-chain protein (single-chain URO-D) in which the two subunits were connected by a flexible linker. The crystal structure of this protein was shown to be superimposable with wild-type activity and to have comparable catalytic activity. Mutations that impaired one or the other of the two active sites of single-chain URO-D resulted in approximately half of wild-type activity. The distributions of reaction intermediates were the same for mutant and wild-type sequences and were unaltered in a competition experiment using I and III isomer substrates. These observations indicate that communication between active sites is not required for enzyme function and suggest that the dimeric structure of URO-D is required to achieve conformational stability and to create a large active-site cleft.

    Organizational Affiliation: 

    Department of Medicine, University of Utah School of Medicine, 5C330 SOM, 30 North 1900 East, Salt Lake City, UT 84132, USA. john.phillips@hsc.utah.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uroporphyrinogen decarboxylase
A
367Homo sapiensMutation(s): 0 
Gene Names: UROD
EC: 4.1.1.37
Find proteins for P06132 (Homo sapiens)
Go to Gene View: UROD
Go to UniProtKB:  P06132
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.194 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 103.447α = 90.00
b = 103.447β = 90.00
c = 70.716γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-07-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description