4FDX

Kinetic and structural characterization of the 4-oxalocrotonate tautomerase isozymes from Methylibium petroleiphilum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.227 

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Literature

Structural and kinetic characterization of two 4-oxalocrotonate tautomerases in Methylibium petroleiphilum strain PM1.

Terrell, C.R.Burks, E.A.Whitman, C.P.Hoffman, D.W.

(2013) Arch Biochem Biophys 537: 113-124

  • DOI: https://doi.org/10.1016/j.abb.2013.06.016
  • Primary Citation of Related Structures:  
    4FAZ, 4FDX

  • PubMed Abstract: 

    Methylibium petroleiphilum strain PM1 uses various petroleum products including the fuel additive methyl tert-butyl ether and straight chain and aromatic hydrocarbons as sole carbon and energy sources. It has two operons, dmpI and dmpII, that code for the enzymes in a pair of parallel meta-fission pathways. In order to understand the roles of the pathways, the 4-oxalocrotonate tautomerase (4-OT) isozyme from each pathway was characterized. Tautomerase I and tautomerase II have the lowest pairwise sequence identity (35%) among the isozyme pairs in the parallel pathways, and could offer insight into substrate preferences and pathway functions. The kinetic parameters of tautomerase I and tautomerase II were determined using 2-hydroxymuconate and 5-(methyl)-2-hydroxymuconate. Both tautomerase I and tautomerase II process the substrates, but with different efficiencies. Crystal structures were determined for both tautomerase I and tautomerase II, at 1.57 and 1.64Å resolution, respectively. The backbones of tautomerase I and tautomerase II are highly similar, but have distinct active site environments. The results, in combination with those for other structurally and kinetically characterized 4-OT isozymes, suggest that tautomerase I catalyzes the tautomerization of both 2-hydroxymuconate and alkyl derivatives, whereas tautomerase II might specialize in other aromatic hydrocarbon metabolites.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Texas, Austin, 78712, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
4-oxalocrotonase tautomerase isozyme
A, B
70Methylibium petroleiphilum PM1Mutation(s): 0 
Gene Names: Mpe_A3323
EC: 5.3.2.2
UniProt
Find proteins for A2SL37 (Methylibium petroleiphilum (strain ATCC BAA-1232 / LMG 22953 / PM1))
Explore A2SL37 
Go to UniProtKB:  A2SL37
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA2SL37
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.227 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.236α = 90
b = 50.236β = 90
c = 158.078γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-12
    Type: Initial release
  • Version 1.1: 2014-03-26
    Changes: Database references