Protein kinase D (PKD), a serine threonine protein kinase activated by diacylglycerol downstream of PKC signaling, has three human isoforms that modulate cell proliferation, survival, invasion, and protein transport. CRT0066101 acts as an inhibitor of these three PKD isoforms, with IC50 values of 1, 2.5, and 2 nM for PKD1, PKD2, and PKD3, respectively. It demonstrates selectivity for PKD over a range of more than 90 protein kinases, including PKCα, PKBα, MEK, ERK, c-Raf, c-Src, and c-Abl. This specificity allows CRT0066101 to inhibit cell proliferation, induce apoptosis, and notably reduce the viability of pancreatic cancer cells both in vitro and in vivo.
Protein kinase D inhibitor 1 (compound 17m) is a potent pan-PKD inhibitor. It exhibits inhibitory activity in the low nanomolar range, with IC50 values ranging between 17 and 35 nM. By inhibiting protein kinase D, this compound effectively suppresses cortactin phosphorylation, which is known to be PKD-dependent [1].
(S,R,S)-AHPC-O-Ph-PEG1-NH2 (VH032-O-Ph-PEG1-NH2) serves as an E3 ligase ligand-linker conjugate, integrating a VHL ligand for the E3 ubiquitin ligase and a PROTAC linker. This compound is utilized in PROTAC EED degrader-1, a PROTAC that targets EED with a potency (pKD) of 9.02[1].