Mcl-1 inhibitor 6 is a potent, orally active chemical compound that selectively inhibits the myeloid cell leukemia 1 (Mcl-1) protein, with a high affinity (K d = 0.23 nM) and binding activity (K i = 0.02 μM). This compound exhibits exceptional selectivity over other members of the Bcl-2 family, including Bcl-2, Bcl2A1, Bcl-xL, and Bcl-w (K d >10 μM). Notably, Mcl-1 inhibitor 6 demonstrates strong antitumor activity.
HA-14-1, a small molecule, binds the surface pocket of Bcl-2 proteins (IC50= ~ 9 µM), including Bcl-xl and Bcl-W, and disrupts their interaction with the Bak peptide. This action induces apoptosis by activating Apaf-1 and caspase-9 and -3. Additionally, HA-14-1 effectively induces apoptosis in human acute myeloid leukemia (HL-60) cells, with a 50 µM concentration resulting in a 90% loss of cell viability.