Investigating Protein Binding with the Isothermal Ligand‐induced Resolubilization Assay

Abstract: Target engagement assays typically detect and quantify the direct physical interaction of a protein of interest and its ligand through stability changes upon ligand binding. Commonly used target engagement methods detect ligand‐induced stability by subjecting samples to thermal or proteolytic stress. Here we describe a new variation to these approaches called Isothermal Ligand‐induced Resolubilization Assay (ILIRA), which utilizes lyotropic solubility stress to measure ligand binding through changes in target protein solubility. We identified distinct buffer systems and salt concentrations that compromised protein solubility for four diverse proteins: dihydrofolate reductase (DHFR), nucleoside diphosphate‐linked moiety X motif 5 (NUDT5), poly [ADP‐ribose] polymerase 1 (PARP1), and protein arginine N‐methyltransferase 1 (PRMT1). Ligand‐induced solubility rescue was demonstrated for these proteins, suggesting that ILIRA can be used as an additional target engagement technique. Differences in ligand‐induced protein solubility were assessed by Coomassie blue staining for SDS‐PAGE and dot blot, as well as by NanoOrange, Thioflavin T, and Proteostat fluorescence, thus offering flexibility for readout and assay throughput.

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

Erschienen in
Investigating Protein Binding with the Isothermal Ligand‐induced Resolubilization Assay ; day:12 ; month:02 ; year:2024 ; extent:10
ChemBioChem ; (12.02.2024) (gesamt 10)

Urheber
Prout‐Holm, Riley A.
van Walstijn, Cerissa C.
Hitsman, Alana
Rowley, Michael J.
Olsen, Jonas E.
Page, Brent D. G.
Frankel, Adam

DOI
10.1002/cbic.202300773
URN
urn:nbn:de:101:1-2024021314142269871269
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:26 MESZ

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Beteiligte

  • Prout‐Holm, Riley A.
  • van Walstijn, Cerissa C.
  • Hitsman, Alana
  • Rowley, Michael J.
  • Olsen, Jonas E.
  • Page, Brent D. G.
  • Frankel, Adam

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