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Related Experiment Videos

Making tissue-type plasminogen activator more fibrin specific

N F Paoni1, A M Chow, L C Peña

  • 1Department of Cardiovascular Research, Genetech, Inc., South San Francisco, CA 94080.

Protein Engineering
|July 1, 1993
PubMed
Summary

Mutagenesis of tissue-type plasminogen activator (t-PA) at specific protease domain sites enhances fibrin specificity. These modifications reduce fibrinogen activity while maintaining normal fibrin activity, improving t-PA

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Engineering

Background:

  • Tissue-type plasminogen activator (t-PA) is a crucial enzyme in fibrinolysis.
  • Enhancing t-PA's fibrin specificity is key to improving its therapeutic applications.
  • Previous studies identified potential sites for t-PA mutagenesis.

Purpose of the Study:

  • To investigate the impact of mutagenesis at specific protease domain sites on t-PA's fibrin specificity.
  • To analyze the kinetic properties of t-PA variants with mutations in key functional regions.

Main Methods:

  • Site-directed mutagenesis was performed at four identified regions within the t-PA protease domain.
  • Kinetic analysis (kcat, Km) was conducted for wild-type and mutant t-PA in the presence of fibrinogen and fibrin.

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  • Mutagenesis sites included I276, KHRR 296-299, DDD 364-366, and residues H432, R434, D460, R462, and PQANL 466-470.

    • Main Results:

    • Mutations at all investigated sites significantly reduced fibrinogen-stimulated activity.
    • Fibrin-stimulated activity remained normal or increased for most variants.
    • Mutations at KHRR 296-299 uniquely increased both kcat and Km in the presence of fibrin, suggesting a direct interaction modulation.

    Conclusions:

    • Targeted mutagenesis of the t-PA protease domain can effectively enhance fibrin specificity.
    • Mutations alter the enzyme's catalytic efficiency differently in the presence of fibrinogen versus fibrin.
    • Additive effects of combined mutations suggest a combinatorial approach to optimize t-PA function.