The Identification of Potent, Selective, and Brain Penetrant PI5P4Kγ Inhibitors as In Vivo-Ready Tool Molecules

Owing to their central role in regulating cell signaling
pathways,
the phosphatidylinositol 5-phosphate 4-kinases (PI5P4Ks) are attractive
therapeutic targets in diseases such as cancer, neurodegeneration,
and immunological disorders. Until now, tool molecules for these kinases
have been either limited in potency or isoform selectivity, which
has hampered further investigation of biology and drug development.
Herein we describe the virtual screening workflow which identified
a series of thienylpyrimidines as PI5P4Kγ-selective inhibitors,
as well as the medicinal chemistry optimization of this chemotype,
to provide potent and selective tool molecules for further use. In
vivo pharmacokinetics data are presented for exemplar tool molecules,
along with an X-ray structure for ARUK2001607 (15) in
complex with PI5P4Kγ, along with its selectivity data against
>150 kinases and a Cerep safety panel.