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Related Experiment Videos

Human leucocyte elastase and cathepsin G: structural and functional characteristics.

J Travis, P J Giles, L Porcelli

    Ciba Foundation Symposium
    |January 1, 1979
    PubMed
    Summary

    Neutrophil granulocytes release elastase and cathepsin G enzymes. These enzymes degrade structural proteins like myosin and elastin, but their specific roles in tissue and muscle diseases require further investigation.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Neutrophil granulocytes release elastase and cathepsin G, key endoproteinases.
    • Elastase is implicated in tissue damage in emphysema and rheumatoid arthritis.
    • The precise function of cathepsin G remains largely unknown.

    Purpose of the Study:

    • To isolate isoenzymes of neutrophil elastase and cathepsin G.
    • To develop specific plasma inhibitors and synthetic substrates for these enzymes.
    • To investigate the functional roles and homologies of cathepsin G and elastase.

    Main Methods:

    • Isolation of elastase and cathepsin G isoenzymes.
    • Preparation of specific plasma inhibitors and synthetic substrates.
    • Sequence analysis to determine enzyme homology.

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  • Degradation studies using structural proteins (myosin, elastin, proteoglycan).

    • Main Results:

    • Homology observed between elastase, cathepsin G, pancreatic proteinases, and muscle/mast cell enzymes.
    • Both elastase and cathepsin G can degrade myosin, elastin, and proteoglycan.
    • Simple isolation procedures and inhibitor preparations were successfully developed.

    Conclusions:

    • Elastase and cathepsin G possess broad substrate specificity, degrading key structural proteins.
    • Further research is needed to clarify the specific roles of these enzymes in muscle protein turnover and disease.
    • The developed methods facilitate further investigation into neutrophil proteinase function.