2. Academic Validation
  3. Design, Synthesis, and Application of Fluorescent Ligands Targeting the Intracellular Allosteric Binding Site of the CXC Chemokine Receptor 2

Design, Synthesis, and Application of Fluorescent Ligands Targeting the Intracellular Allosteric Binding Site of the CXC Chemokine Receptor 2

  • J Med Chem. 2023 Sep 28;66(18):12911-12930. doi: 10.1021/acs.jmedchem.3c00849.
Bianca Maria Casella 1,  James P Farmer 2,  Desislava N Nesheva 2,  Huw E L Williams 3,  Steven J Charlton 2 4,  Nicholas D Holliday 2 5,  Charles A Laughton 1,  Shailesh N Mistry 1
Affiliations

Affiliations

  • 1 Division of Biomolecular Sciences and Medicinal Chemistry, School of Pharmacy, University of Nottingham Biodiscovery Institute, Nottingham NG7 2RD, UK.
  • 2 Division of Physiology, Pharmacology & Neuroscience, Medical School, School of Life Sciences, University of Nottingham, Nottingham NG7 2UH, UK.
  • 3 School of Chemistry, University of Nottingham Biodiscovery Institute, Nottingham NG7 2RD, UK.
  • 4 OMass Therapeutics Ltd., Oxford OX4 2GX, UK.
  • 5 Excellerate Bioscience Ltd., Biocity, University of Nottingham, Nottingham NG1 1GF, UK.
PMID: 37523859 DOI: 10.1021/acs.jmedchem.3c00849
Abstract

The inhibition of CXC Chemokine Receptor 2 (CXCR2), a key inflammatory mediator, is a potential strategy in the treatment of several pulmonary diseases and cancers. The complexity of endogenous chemokine interaction with the orthosteric binding site has led to the development of CXCR2 negative allosteric modulators (NAMs) targeting an intracellular pocket near the G protein binding site. Our understanding of NAM binding and mode of action has been limited by the availability of suitable tracer ligands for competition studies, allowing direct ligand binding measurements. Here, we report the rational design, synthesis, and pharmacological evaluation of a series of fluorescent NAMs, based on navarixin (2), which display high affinity and preferential binding for CXCR2 over CXCR1. We demonstrate their application in fluorescence imaging and NanoBRET binding assays, in whole cells or membranes, capable of kinetic and equilibrium analysis of NAM binding, providing a platform to screen for alternative chemophores targeting these receptors.

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