). Carboxyfluorescein-labeled phenylalanine chloromethyl ketone (FAM-FFCK) was from Immuno Chemistry Technologies (Bloomington
). Carboxyfluorescein-labeled phenylalanine chloromethyl ketone (FAM-FFCK) was from Immuno Chemistry Technologies (Bloomington, MN, USA). Staurosporine was obtained from Selleckchem (Munich, Germany), Ubiquitin vinyl methyl ester, HA-tag (HaUbVME) from Enzo Life…