Crystal structure of Pseudomonas sp. P51 Chloromuconate lactonizing enzyme

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 

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The structure of Pseudomonas P51 Cl-muconate lactonizing enzyme: co-evolution of structure and dynamics with the dehalogenation function.

Kajander, T.Lehtio, L.Schlomann, M.Goldman, A.

(2003) Protein Sci 12: 1855-1864

  • DOI: https://doi.org/10.1110/ps.0388503
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacterial muconate lactonizing enzymes (MLEs) catalyze the conversion of cis,cis-muconate as a part of the beta-ketoadipate pathway, and some MLEs are also able to dehalogenate chlorinated muconates (Cl-MLEs). The basis for the Cl-MLEs dehalogenating activity is still unclear. To further elucidate the differences between MLEs and Cl-MLEs, we have solved the structure of Pseudomonas P51 Cl-MLE at 1.95 A resolution. Comparison of Pseudomonas MLE and Cl-MLE structures reveals the presence of a large cavity in the Cl-MLEs. The cavity may be related to conformational changes on substrate binding in Cl-MLEs, at Gly52. Site-directed mutagenesis on Pseudomonas MLE core positions to the equivalent Cl-MLE residues showed that the variant Thr52Gly was rather inactive, whereas the Thr52Gly-Phe103Ser variant had regained part of the activity. These residues form a hydrogen bond in the Cl-MLEs. The Cl-MLE structure, as a result of the Thr-to-Gly change, is more flexible than MLE: As a mobile loop closes over the active site, a conformational change at Gly52 is observed in Cl-MLEs. The loose packing and structural motions in Cl-MLE may be required for the rotation of the lactone ring in the active site necessary for the dehalogenating activity of Cl-MLEs. Furthermore, we also suggest that differences in the active site mobile loop sequence between MLEs and Cl-MLEs result in lower active site polarity in Cl-MLEs, possibly affecting catalysis. These changes could result in slower product release from Cl-MLEs and make it a better enzyme for dehalogenation of substrate.

  • Organizational Affiliation

    Research Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, FIN-00014 Helsinki, Finland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chloromuconate cycloisomerase370Pseudomonas sp. P51Mutation(s): 0 
Find proteins for P27099 (Pseudomonas sp. (strain P51))
Explore P27099 
Go to UniProtKB:  P27099
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27099
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 135.355α = 90
b = 135.355β = 90
c = 105.033γ = 90
Software Package:
Software NamePurpose
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: 2003-12-30
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Source and taxonomy, Version format compliance
  • Version 1.3: 2018-05-23
    Changes: Data collection
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references, Derived calculations