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Updated: May 22, 2025

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Redirecting the Peptide Cleavage Causes Protease Inactivation.

Michael Gütschow1,2, Christian Breuer1, Jim Küppers1

  • 1Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, An der Immenburg 4, 53121, Bonn, Germany.

Angewandte Chemie (International Ed. in English)
|May 21, 2025
PubMed
Summary
This summary is machine-generated.

Researchers discovered a novel irreversible inhibition mechanism for human cathepsin B using peptidomimetics. This unique covalent catalysis extends the drug development space for cysteine proteases.

Keywords:
Cysteine proteaseEnzyme inhibitionPeptide cleavageSuicide substratesTranscarbamoylation

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Area of Science:

  • Biochemistry
  • Enzymology
  • Medicinal Chemistry

Background:

  • Cysteine and serine proteases utilize covalent catalysis for peptide bond cleavage.
  • Human cathepsin B is a therapeutically significant cysteine protease.
  • Existing protease inhibitors often target active sites but may not achieve irreversible inhibition.

Purpose of the Study:

  • To design novel peptidomimetics targeting human cathepsin B.
  • To investigate a unique mechanism of enzyme inactivation.
  • To explore a new avenue for covalent drug development.

Main Methods:

  • Design and synthesis of peptidomimetics with N-terminal carbamate warheads.
  • Characterization of inhibitor interaction with human cathepsin B.
  • Analysis of the catalytic mechanism and resulting enzyme-protease complex.

Main Results:

  • Demonstrated a unique redirection of the catalytic event leading to strong enzyme inactivation.
  • Developed peptidomimetics that irreversibly inhibit human cathepsin B.
  • Showcased carbamate deprotonation by active site thiolate initiating redirected cleavage.

Conclusions:

  • A novel mechanism of irreversible protease inhibition was elucidated.
  • Tailored peptidomimetics offer a new strategy for targeting cysteine proteases like cathepsin B.
  • This work expands the covalent drug space for therapeutic applications.