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Related Experiment Videos

Rhodamine-based compounds as fluorogenic substrates for serine proteinases.

S P Leytus, L L Melhado, W F Mangel

    The Biochemical Journal
    |February 1, 1983
    PubMed
    Summary

    Researchers developed a novel fluorogenic substrate, (Cbz-Arg-NH)2-Rhodamine, for serine proteinases. This Rhodamine-based compound enhances enzyme activity detection sensitivity by up to 300-fold.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Fluorogenic Assays

    Background:

    • Serine proteinases play critical roles in biological processes.
    • Accurate measurement of their amidase activity is essential for research and diagnostics.
    • Existing fluorogenic substrates have limitations in sensitivity and scope.

    Purpose of the Study:

    • To synthesize and characterize a novel fluorogenic substrate for serine proteinases.
    • To evaluate the sensitivity and utility of the new substrate compared to existing ones.
    • To investigate the spectroscopic properties of the substrate and its cleavage products.

    Main Methods:

    • Synthesis and purification of bis(N-benzyloxycarbonyl-L-argininamido)Rhodamine [(Cbz-Arg-NH)2-Rhodamine].
    • Chemical and enzymatic characterization of the substrate.

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  • Spectroscopic analysis (absorption, emission, quantum yield) of Rhodamine derivatives.
  • Determination of kinetic constants with various serine proteinases (trypsin, plasmin, thrombin).

    • Main Results:

    • Successful synthesis and characterization of the novel Rhodamine-based fluorogenic substrate.
    • Enzymatic cleavage by trypsin-like serine proteinases yields a highly fluorescent monoamide product.
    • Demonstrated significant increases in sensitivity (50-300 fold) compared to coumarin-based substrates.
    • Reported distinct spectral properties and quantum yields for bis-, mono-, and unsubstituted Rhodamine.

    Conclusions:

    • The new substrate (Cbz-Arg-NH)2-Rhodamine offers superior sensitivity for detecting serine proteinase activity.
    • Its Rhodamine fluorophore provides enhanced detection capabilities.
    • This substrate represents a valuable tool for studying serine proteinases in various biological contexts.