Oligopeptidase B (OpdB, E.C. 3.4.21.83) is a proteolytic enzyme that belongs to the prolyl oligopeptidase family (POP) of serine proteases [10, 24]. Initially discovered in E. coli, this enzyme was found in several gram-negative bacteria, spirochetes, [6, 24], and protozoa [5, 14], but not in higher eukaryotes, with the exception of some plants [6]. Although the physiological role of OpdB has n...
