BMS-1166-N-piperidine-COOH, the BMS-1166-based moiety, binds to E3 ligase ligand via a linker to form PROTAC PD-1/PD-L1 degrader-1 to degrade PD-1/PD-L1[1]. BMS-1166 is a potent PD-1/PD-L1 interaction inhibitor with an IC50 of 1.4 nM. BMS-1166 antagonizes the inhibitory effect of PD-1/PD-L1 immune checkpoint on T cell activation[2].
[1]. Binbin Cheng, et al. Discovery of Novel Resorcinol Diphenyl Ether-Based PROTAC-like Molecules as Dual Inhibitors and Degraders of PD-L1. Eur J Med Chem. 2020 Aug 1;199:112377.
[2]. Guzik K, et al. Small-Molecule Inhibitors of the Programmed Cell Death-1/Programmed Death-Ligand 1 (PD-1/PD-L1) Interaction via Transiently Induced Protein States and Dimerization of PD-L1. J Med Chem. 2017 Jul 13;60(13):5857-5867.