May contribute to the degradation of peptide hormones and be involved in the inactivation of neuronal peptides. Binds 1 zinc ion. According to a report, mice die of respiratory failure shortly after birth (PubMed:10400672). According to a second report, mice exhibit perturbed terminal branching of motor neurons to the endplate of skeletal muscles, resulting in poor formation of the neuromuscular junction (PubMed:23261301). Belongs to the peptidase M13 family.