Oligopeptidase A (EC 3.4.24.70, 68000-M signalpeptide hydrolase) is an enzyme. This enzyme catalyses the following chemical reaction Oligopeptidase A (EC 3.4.24.70, 68000-M signalpeptide hydrolase) is an enzyme. This enzyme catalyses the following chemical reaction This enzyme is known from Escherichia coli and Salmonella typhimurium.