Halogen Substituents in the Isoquinoline Scaffold Switches the Selectivity of Inhibition between USP2 and USP7

Ganga B. Vamisetti, Roman Meledin, Pushparathinam Gopinath, Ashraf Brik

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Deubiquitinases are important components of the protein regulatory network and, hence, constitute a tempting drug target. We report herein structure–activity relationship studies to develop halogen-substituted isoquionoline-1,3-dione-based inhibitors of the deubiquitinase USP2. In contrast to our previous reports, the best compound discovered was found to act through a reactive oxygen species independent, uncompetitive mechanism with an IC 50 of 250 nm. We show the crucial role of halogens in the common scaffold to provide potency and selectivity of our compound, where the introduction of the fluorine atom completely switches the selectivity of the inhibitor between USP2 and USP7. Our cellular studies highlight the potential applicability of the reported compound for in vivo experiments. The discovery of the isoquinoline-1,3-dione core and the knowledge obtained with regard to halogen substituents provide a platform towards understanding USP2 inhibition and the development of highly selective next-generation deubiquitinase inhibitors.

Original languageEnglish
Pages (from-to)282-286
Number of pages5
JournalChemBioChem
Volume20
Issue number2
DOIs
StatePublished - 18 Jan 2019
Externally publishedYes

Keywords

  • deubiquitinases
  • halogens
  • heterocycles
  • inhibitors
  • structure–activity relationships

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