Peptidase that cleaves SIBLING (small integrin-binding ligand, N-linked glycoprotein)-derived ASARM peptides, thus regulating their biological activity (PubMed:9593714, PubMed:15664000, PubMed:18162525, PubMed:18597632). Cleaves ASARM peptides between Ser and Glu or Asp residues (PubMed:18597632). Regulates osteogenic cell differentiation and bone mineralization through the cleavage of the MEPE-derived ASARM peptide (PubMed:18597632). Promotes dentin mineralization and renal phosphate reabsorption by cleaving DMP1- and MEPE-derived ASARM peptides (PubMed:18597632, PubMed:18162525). Inhibits the cleavage of MEPE by CTSB/cathepsin B thus preventing MEPE degradation (PubMed:12220505). Binds 1 zinc ion per subunit. Interacts with MEPE; the interaction is zinc-dependent (via ASARM motif). Specifically expressed in ovary (PubMed:9070861). Expressed at low levels in kidney (PubMed:9070861). Expressed in fetal lung (PubMed:9070861, PubMed:9077527). Expressed in fetal calvaria and to a lesser extent in fetal kidney and skeletal muscles (PubMed:9593714, PubMed:9077527). The disease is caused by variants affecting the gene represented in this entry. Belongs to the peptidase M13 family.