2D0D

Crystal Structure of a Meta-cleavage Product Hydrolase (CumD) A129V Mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.173 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Improving the catalytic efficiency of a meta-cleavage product hydrolase (CumD) from Pseudomonas fluorescens IP01

Jun, S.Y.Fushinobu, S.Nojiri, H.Omori, T.Shoun, H.Wakagi, T.

(2006) Biochim Biophys Acta 1764: 1159-1166

  • DOI: https://doi.org/10.1016/j.bbapap.2006.05.010
  • Primary Citation of Related Structures:  
    2D0D

  • PubMed Abstract: 

    The meta-cleavage product hydrolase from Pseudomonas fluorescens IP01 (CumD) hydrolyzes 2-hydroxy-6-oxo-7-methylocta-2,4-dienoate (6-isopropyl HODA) in the cumene (isopropylbenzene) degradation pathway. To modulate the substrate specificity and catalytic efficiency of CumD toward substrates derived from monocyclic aromatic compounds, we constructed the CumD mutants, A129V, I199V, and V227I, as well as four types of double and triple mutants. Toward substrates with smaller side chains (e.g. 2-hydroxy-6-oxohepta-2,4-dienoate; 6-ethyl-HODA), the k(cat)/K(m) values of the single mutants were 4.2-11 fold higher than that of the wild type enzyme and 1.8-4.7 fold higher than that of the meta-cleavage product hydrolase from Pseudomonas putida F1 (TodF). The A129V mutant showed the highest k(cat)/K(m) value for 2-hydroxy-6-oxohepta-2,4-dienoate (6-ethyl-HODA). The crystal structure of the A129V mutant was determined at 1.65 A resolution, enabling location of the Ogamma atom of the Ser103 side chain. A chloride ion was bound to the oxyanion hole of the active site, and mutant enzymes at the residues forming this site were also examined. The k(cat) values of Ser34 mutants were decreased 2.9-65 fold, suggesting that the side chain of Ser34 supports catalysis by stabilizing the anionic oxygen of the proposed intermediate state (gem-diolate). This is the first crystal structure determination of CumD in an active form, with the Ser103 residue, one of the catalytically essential "triad", being intact.


  • Organizational Affiliation

    Laboratory of Enzymology, Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
2-hydroxy-6-oxo-7-methylocta-2,4-dienoate hydrolase282Pseudomonas fluorescensMutation(s): 1 
Gene Names: CUMD
EC: 3.7.1.9
UniProt
Find proteins for P96965 (Pseudomonas fluorescens)
Explore P96965 
Go to UniProtKB:  P96965
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP96965
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.173 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.65α = 90
b = 116.623β = 90
c = 78.64γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-06-06
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-10-25
    Changes: Data collection, Refinement description