Towards the Development of Small-Molecule MO25Binders as Potential Indirect SPAK/OSR1 Kinase Inhibitors

Hachemi Kadri, Mubarak Abdulrahman M Alamri, Iva Navratilova, Luke Alderwick, Nigel Simpkins, Youcef Mehellou

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
218 Downloads (Pure)

Abstract

The binding of the scaffolding protein MO25 to SPAK andOSR1 protein kinases, which regu late ion homeostasis, causesincreases of up to 100-fold in their catalytic activity. Variousanimal models have shown that the inhibition of SPAK andOSR1 lowers blood pressure, andsohere we present anewindirect approachtoinhibiting SPAK and OSR1 kinases by tar-geting their protein partner MO25. To explorethis approach,we developed afluorescent polarisation assay and used it inscreening of asmall in-house library of &4000 compounds.This led to the identification of one compound—H K01—as thefirst small-molecule inhibitor of the MO25-dependent activa-tion of SPAK and OSR1 in vitro. Our data confirm the feasibilityof targeting this protein–protein interaction by small-moleculecompounds and highlights their potential to modulate ion co-transporters and thus cellular electrolyte balance.
Original languageEnglish
Pages (from-to)460-465
JournalChemBioChem
Volume18
Issue number5
Early online date30 Jan 2017
DOIs
Publication statusPublished - 2 Mar 2017

Keywords

  • high-throughput screening
  • inhibitors
  • MO25
  • OSR1
  • scaffolding
  • SPAK

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