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Internally quenched fluorogenic substrate for furin

H Angliker1, U Neumann, S S Molloy

  • 1Friedrich Miescher-Institut, Basel, Switzerland.

Analytical Biochemistry
|January 1, 1995
PubMed
Summary
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A novel fluorogenic substrate for furin was synthesized and characterized. This new substrate exhibits significantly higher cleavage efficiency compared to existing options, offering improved research capabilities.

Area of Science:

  • Biochemistry
  • Enzymology
  • Protease research

Background:

  • Furin is a key proprotein convertase involved in various biological processes.
  • Existing fluorogenic substrates for furin lack optimal sensitivity and efficiency.
  • Development of sensitive substrates is crucial for studying furin activity.

Purpose of the Study:

  • To synthesize and characterize a new internally quenched fluorogenic substrate for furin.
  • To evaluate the kinetic parameters and cleavage efficiency of the novel substrate.
  • To compare the performance of the new substrate with a commonly used one.

Main Methods:

  • Chemical synthesis of the novel peptide substrate: Abz-Arg-Val-Lys-Arg-Gly-Leu-Ala-Tyr(NO2)-Asp-OH.
  • Characterization of the synthesized substrate.

Related Experiment Videos

  • Fluorogenic assay to determine kinetic parameters (Km, kcat, kcat/KM) of furin cleavage.
  • Comparative analysis with Boc-Arg-Val-Arg-Arg-AMC.

    • Main Results:

    • The novel substrate, Abz-Arg-Val-Lys-Arg-Gly-Leu-Ala-Tyr(NO2)-Asp-OH, was successfully synthesized and characterized.
    • Kinetic analysis revealed Km = 3.8 microM, kcat = 29.3 s-1, and kcat/KM = 7,710,000 M-1 s-1.
    • The new substrate demonstrated over 2000-fold higher kcat/KM than Boc-Arg-Val-Arg-Arg-AMC, indicating superior cleavage efficiency.

    Conclusions:

    • A highly efficient fluorogenic substrate for furin has been developed.
    • This novel substrate offers a significant advancement over existing tools for furin research.
    • The enhanced sensitivity and efficiency will facilitate more accurate studies of furin enzymatic activity.