Cell‐Based Optimization of Covalent Reversible Ketoamide Inhibitors Bridging the Unprimed to the Primed Site of the Proteasome β5 Subunit

Abstract: The ubiquitin‐proteasome system (UPS) is an established therapeutic target for approved drugs to treat selected hematologic malignancies. While drug discovery targeting the UPS focuses on irreversibly binding epoxyketones and slowly‐reversibly binding boronates, optimization of novel covalent‐reversibly binding warheads remains largely unattended. We previously reported α‐ketoamides to be a promising reversible lead motif, yet the cytotoxic activity required further optimization. This work focuses on the lead optimization of phenoxy‐substituted α‐ketoamides combining the structure‐activity relationships from the primed and the non‐primed site of the proteasome β5 subunit. Our optimization strategy is accompanied by molecular modeling, suggesting occupation of P1′ by a 3‐phenoxy group to increase β5 inhibition and cytotoxic activity in leukemia cell lines. Key compounds were further profiled for time‐dependent inhibition of cellular substrate conversion. Furthermore, the α‐ketoamide lead structure 27 does not affect escape response behavior in Danio rerio embryos, in contrast to bortezomib, which suggests increased target specificity.

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Cell‐Based Optimization of Covalent Reversible Ketoamide Inhibitors Bridging the Unprimed to the Primed Site of the Proteasome β5 Subunit ; volume:14 ; number:23 ; year:2019 ; pages:2005-2022 ; extent:18
ChemMedChem ; 14, Heft 23 (2019), 2005-2022 (gesamt 18)

Urheber
Stubba, Daniel
Bensinger, Dennis
Steinbacher, Janika
Proskurjakov, Lilia
Salcedo Gómez, Álvaro
Schmidt, Uwe
Roth, Stefan
Schmitz, Katja
Schmidt, Boris

DOI
10.1002/cmdc.201900472
URN
urn:nbn:de:101:1-2022072608200145798617
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 05:19 UTC

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Beteiligte

  • Stubba, Daniel
  • Bensinger, Dennis
  • Steinbacher, Janika
  • Proskurjakov, Lilia
  • Salcedo Gómez, Álvaro
  • Schmidt, Uwe
  • Roth, Stefan
  • Schmitz, Katja
  • Schmidt, Boris

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