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Thymidine kinase mutants obtained by random sequence selection

K M Munir1, D C French, L A Loeb

  • 1Joseph Gottstein Memorial Cancer Research Laboratory, Department of Pathology, University of Washington, Seattle 98195.

Proceedings of the National Academy of Sciences of the United States of America
|May 1, 1993
PubMed
Summary
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Researchers engineered herpes simplex virus type 1 thymidine kinase mutants with altered catalytic properties and enhanced stability. This method uses random mutagenesis and genetic selection to create novel enzymes for potential gene therapy applications.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzyme Engineering

Background:

  • Enzyme function modification is challenging due to unknown structure-activity relationships.
  • Site-specific mutagenesis requires detailed knowledge of enzyme active sites.
  • Random mutagenesis coupled with genetic selection offers an alternative for enzyme engineering.

Purpose of the Study:

  • To construct and characterize herpes simplex virus type 1 thymidine kinase (HSV-1 TK) mutants.
  • To identify enzyme variants with altered catalytic properties or enhanced thermostability.
  • To explore the potential of engineered enzymes in gene therapy.

Main Methods:

  • Construction of a large library of plasmid-encoded HSV-1 TK genes with random mutations.
  • Genetic selection of active TK mutants using Escherichia coli.

Related Experiment Videos

  • Characterization of mutant enzyme kinetics and thermostability.
  • Secondary selection using 3'-azido-3'-deoxythymidine (AZT) to identify specific functional changes.

    • Main Results:

    • 1540 active HSV-1 TK mutants were generated from a library of 2 x 10^6 variants.
    • Two mutant enzymes showed reduced Michaelis constant (Km) for AZT, with one exhibiting higher catalytic efficiency for AZT.
    • One mutant displayed enhanced thermostability.
    • Mutants were identified that conferred AZT sensitivity to E. coli, enabling selection.

    Conclusions:

    • Random mutagenesis and genetic selection are effective for engineering enzyme properties.
    • Engineered HSV-1 TK mutants demonstrate altered substrate specificity and improved stability.
    • These enzyme variants hold promise for applications in gene therapy and antiviral drug development.