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Intrinsic enzyme activity associated with tropoelastin

R P Mecham, J A Foster, C Franzblau

    Biochimica Et Biophysica Acta
    |September 28, 1976
    PubMed
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    An enzyme tightly bound to tropoelastin was identified. This enzyme exhibits specific fragmentation patterns and is active between pH 7-9, suggesting a role in elastin processing.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Protein Chemistry

    Background:

    • Tropoelastin is the precursor protein to elastin, a key component of connective tissues.
    • The presence and function of associated enzymes in purified tropoelastin preparations are not fully understood.

    Purpose of the Study:

    • To establish the presence and characteristics of enzyme(s) associated with purified tropoelastin.
    • To investigate the properties and potential role of these enzymes in elastin processing.

    Main Methods:

    • Purification of tropoelastin.
    • Enzymatic activity assays across a pH range (7-9) at 37°C.
    • Inhibition studies using specific agents (disodium ethylenediaminetetraacetate, N-ethylmaleimide, sulfite, soybean trypsin inhibitor, human alpha-1-antitrypsin).

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  • Analysis of fragmentation patterns.

    • Main Results:

    • Enzymatic activity was confirmed in purified tropoelastin preparations.
    • The enzyme(s) demonstrated tight association with soluble elastin throughout purification.
    • Optimal enzymatic activity was observed between pH 7-9 at 37°C.
    • Specific inhibitors affected enzymatic activity, and fragmentation patterns were reproducible.

    Conclusions:

    • A tightly bound enzyme(s) is associated with purified tropoelastin.
    • This enzyme exhibits specific and reproducible fragmentation activity under defined conditions (pH 7-9, 37°C).
    • The findings suggest a potential role for this enzyme in the biological processing or modification of tropoelastin.