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Related Experiment Videos

Haloalkane dehalogenases: structure of a Rhodococcus enzyme.

J Newman1, T S Peat, R Richard

  • 1Life Sciences Division, Los Alamos National Laboratory, New Mexico. janet@stromix.com

Biochemistry
|December 10, 1999
PubMed
Summary
This summary is machine-generated.

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Haloalkane dehalogenases from Rhodococcus and Xanthobacter show distinct structural and catalytic properties. The Rhodococcus enzyme

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Haloalkane dehalogenases are crucial for bioremediation and biocatalysis.
  • Two main classes exist: Xanthobacter and Rhodococcus enzymes, sharing 30% sequence identity but differing in substrate specificity and halide binding.
  • Understanding their structural basis is key to optimizing their applications.

Purpose of the Study:

  • To elucidate the structural basis for the differing substrate specificities and halide-binding properties of Rhodococcus and Xanthobacter haloalkane dehalogenases.
  • To determine the crystal structure of the Rhodococcus dehalogenase and compare it with the Xanthobacter enzyme.

Main Methods:

  • X-ray crystallography was used to determine the 1.5 Å resolution crystal structure of the Rhodococcus dehalogenase.

Related Experiment Videos

  • Structures were obtained at pH 5.5, pH 7.0, and in the presence of NaI.
  • Comparative structural analysis with the Xanthobacter enzyme was performed.

    • Main Results:

    • The Rhodococcus and Xanthobacter enzymes share structural homology in their core but differ in the cap domain, with Rhodococcus having a larger active site cavity.
    • A distinct catalytic triad topology was observed: Rhodococcus utilizes E141, while Xanthobacter uses D260.
    • Two iodide binding sites were identified in the Rhodococcus enzyme, and a rare stable S-I covalent bond was observed with C187 when cocrystallized with NaI.

    Conclusions:

    • The structural differences, particularly in the cap domain and active site cavity, explain the broader substrate specificity of the Rhodococcus dehalogenase.
    • The distinct catalytic triad and halide-binding mechanisms highlight the evolutionary divergence between the two enzyme classes.
    • These findings provide insights for engineering dehalogenases with tailored biocatalytic functions.