Reaction catalyzed by ubiquitinyl hydrolase 1 (3.4.19.12)

	N6-(N2-acetyl)Lys-ubiquitin	+		H2O	=			+
	N6-(N2-acetyl)Lys-ubiquitin	+		H2O	=		ubiquitin	+		N2-acetyl-Lys