4MQ5

Crystal Structure of Benzoylformate Decarboxylase Mutant A306F


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.147 
  • R-Value Work: 0.120 
  • R-Value Observed: 0.120 

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Literature

Perturbation of the monomer-monomer interfaces of the benzoylformate decarboxylase tetramer.

Andrews, F.H.Rogers, M.P.Paul, L.N.McLeish, M.J.

(2014) Biochemistry 53: 4358-4367

  • DOI: https://doi.org/10.1021/bi500081r
  • Primary Citation of Related Structures:  
    4MPR, 4MQ5

  • PubMed Abstract: 

    The X-ray structure of benzoylformate decarboxylase (BFDC) from Pseudomonas putida ATCC 12633 shows it to be a tetramer. This was believed to be typical of all thiamin diphosphate-dependent decarboxylases until recently when the structure of KdcA, a branched-chain 2-keto acid decarboxylase from Lactococcus lactis, showed it to be a homodimer. This lent credence to earlier unfolding experiments on pyruvate decarboxylase from Saccharomyces cerevisiae that indicated that it might be active as a dimer. To investigate this possibility in BFDC, we sought to shift the equilibrium toward dimer formation. Point mutations were made in the noncatalytic monomer-monomer interfaces, but these had a minimal effect on both tetramer formation and catalytic activity. Subsequently, the R141E/Y288A/A306F variant was shown by analytical ultracentrifugation to be partially dimeric. It was also found to be catalytically inactive. Further experiments revealed that just two mutations, R141E and A306F, were sufficient to markedly alter the dimer-tetramer equilibrium and to provide an ~450-fold decrease in kcat. Equilibrium denaturation studies suggested that the residual activity was possibly due to the presence of residual tetramer. The structures of the R141E and A306F variants, determined to <1.5 Å resolution, hinted that disruption of the monomer interfaces will be accompanied by movement of a loop containing Leu109 and Leu110. As these residues contribute to the hydrophobicity of the active site and the correct positioning of the substrate, it seems that tetramer formation may well be critical to the catalytic activity of BFDC.


  • Organizational Affiliation

    Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis , Indianapolis, Indiana 46202, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Benzoylformate decarboxylase536Pseudomonas putidaMutation(s): 1 
Gene Names: mdlC
EC: 4.1.1.7
UniProt
Find proteins for P20906 (Pseudomonas putida)
Explore P20906 
Go to UniProtKB:  P20906
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20906
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.147 
  • R-Value Work: 0.120 
  • R-Value Observed: 0.120 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.629α = 90
b = 95.54β = 90
c = 137.59γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-27
    Type: Initial release
  • Version 1.1: 2024-02-28
    Changes: Data collection, Database references, Derived calculations