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Related Experiment Videos

Messenger RNA for human tissue plasminogen activator

G Opdenakker, H Weening, D Collen

    European Journal of Biochemistry
    |January 1, 1982
    PubMed
    Summary
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    Researchers isolated mRNA from melanoma cells to produce extrinsic plasminogen activator (t-PA). The resulting protein demonstrated biological activity and characteristics identical to authentic t-PA.

    Area of Science:

    • Molecular Biology
    • Biochemistry

    Background:

    • Human melanoma cells (Bowes) secrete extrinsic plasminogen activator (t-PA).
    • t-PA plays a crucial role in fibrinolysis.

    Purpose of the Study:

    • To isolate and characterize the mRNA encoding extrinsic plasminogen activator (t-PA).
    • To produce biologically active t-PA from the isolated mRNA.

    Main Methods:

    • Extraction of total RNA from melanoma cells.
    • Isolation of poly(A)-rich RNA using oligo(dT)-cellulose chromatography.
    • In vitro translation of RNA by oocytes.
    • Sucrose gradient centrifugation to determine sedimentation coefficient.
    • Characterization of the translation product using serological assays, fibrinolytic activity assays, and SDS-PAGE.

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    Main Results:

    • A translatable mRNA fraction with a sedimentation coefficient of approximately 19 S was isolated.
    • Oocyte translation produced a protein with extrinsic plasminogen activator biological activity.
    • The translation product exhibited serological cross-reactivity, plasminogen dependency, and an apparent molecular weight of 70,000 Da, consistent with authentic t-PA.

    Conclusions:

    • The study successfully isolated mRNA encoding functional extrinsic plasminogen activator (t-PA).
    • The characterized translation product is identical or highly similar to authentic t-PA, confirming the methodology.