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Conformation and processing of cathepsin D.

R H Pain, T Lah, V Turk

    Bioscience Reports
    |October 1, 1985
    PubMed
    Summary

    Cathepsin D exists in two forms, with similar structures and denaturation behaviors. Proteolytic processing may be linked to protein turnover, impacting enzyme activity and refolding.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Cathepsin D is a key aspartic protease involved in protein degradation.
    • It exists as a single polypeptide chain or a complex of two peptides.
    • Understanding its structure-function relationship is crucial for cellular processes.

    Purpose of the Study:

    • To compare the structural and denaturation properties of different forms of bovine cathepsin D.
    • To investigate the impact of proteolytic processing on cathepsin D structure and activity.
    • To explore the refolding capabilities of separated cathepsin D chains.

    Main Methods:

    • Comparative analysis of secondary structure content.
    • Assessment of aromatic amino acid environments.
    • Two-step denaturation studies.
    • Enzyme activity assays.
    • Limited refolding experiments on separated peptides.

    Main Results:

    • The single polypeptide and two-peptide forms of bovine cathepsin D exhibit similar secondary structures and denaturation profiles.
    • Denaturation leads to irreversible loss of enzyme activity, with partial conformational recovery possible.
    • Separated cathepsin D chains show limited refolding, suggesting structural constraints.
    • The processing of cathepsin D is proposed to be related to protein turnover mechanisms.

    Conclusions:

    • The structural similarity between cathepsin D forms suggests conserved functional domains.
    • Proteolytic processing influences cathepsin D conformation and activity, potentially regulating its role in protein turnover.
    • The limited refolding of separated chains highlights the importance of inter-peptide interactions for structural integrity.

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