7np5

Publication Abstract from PubMed

The inhibition of the nuclear receptor retinoic-acid-receptor-related orphan receptor gammat (RORgammat) is a promising strategy in the treatment of autoimmune diseases. RORgammat features an allosteric binding site within its ligand-binding domain that provides an opportunity to overcome drawbacks associated with orthosteric modulators. Recently, trisubstituted isoxazoles were identified as a novel class of allosteric RORgammat inverse agonists. This chemotype offers new opportunities for optimization into selective and efficacious allosteric drug-like molecules. Here, we explore the structure-activity relationship profile of the isoxazole series utilizing a combination of structure-based design, X-ray crystallography, and biochemical assays. The initial lead isoxazole (FM26) was optimized, resulting in compounds with a approximately 10-fold increase in potency (low nM), significant cellular activity, promising pharmacokinetic properties, and a good selectivity profile over the peroxisome-proliferated-activated receptor gamma and the farnesoid X receptor. We envisage that this work will serve as a platform for the accelerated development of isoxazoles and other novel chemotypes for the effective allosteric targeting of RORgammat.

Structure-Activity Relationship Studies of Trisubstituted Isoxazoles as Selective Allosteric Ligands for the Retinoic-Acid-Receptor-Related Orphan Receptor gammat.,Meijer FA, Saris AOWM, Doveston RG, Oerlemans GJM, de Vries RMJM, Somsen BA, Unger A, Klebl B, Ottmann C, Cossar PJ, Brunsveld L J Med Chem. 2021 May 19. doi: 10.1021/acs.jmedchem.1c00475. PMID:34008974^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.