Demonstration of In Vitro to In Vivo Translation of a TYK2 Inhibitor That Shows Cross Species Potency Differences

Sci Rep. 2020 Jun 2;10(1):8974. doi: 10.1038/s41598-020-65762-y.

Abstract

Translation of modulation of drug target activity to therapeutic effect is a critical aspect for all drug discovery programs. In this work we describe the profiling of a non-receptor tyrosine-protein kinase (TYK2) inhibitor which shows a functionally relevant potency shift between human and preclinical species (e.g. murine, dog, macaque) in both biochemical and cellular assays. Comparison of the structure and sequence homology of TYK2 between human and preclinical species within the ATP binding site highlights a single amino acid (I960 → V) responsible for the potency shift. Through TYK2 kinase domain mutants and a TYK2 980I knock-in mouse model, we demonstrate that this single amino acid change drives a functionally relevant potency difference that exists between human and all evaluated preclinical species, for a series of TYK2 inhibitors which target the ATP binding site.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphate / metabolism
  • Amino Acid Sequence
  • Animals
  • Binding Sites / drug effects
  • Dogs
  • Drug Discovery*
  • Humans
  • Janus Kinase 1
  • Macaca
  • Mice
  • Mutation
  • Protein Domains / genetics
  • Protein Kinase Inhibitors / pharmacology*
  • Sequence Homology, Amino Acid
  • Species Specificity
  • TYK2 Kinase / antagonists & inhibitors*
  • TYK2 Kinase / chemistry*
  • TYK2 Kinase / genetics
  • TYK2 Kinase / metabolism

Substances

  • Protein Kinase Inhibitors
  • Adenosine Triphosphate
  • Janus Kinase 1
  • TYK2 Kinase