Has a major role in enamel formation (PubMed:15235027). Required during the maturation stage of tooth development for clearance of enamel proteins and normal structural patterning of the crystalline matrix (By similarity). Expressed in prostate. N-glycosylated. The N-glycan structures are of complex diantennary or triantennary type, which may be further modified with up to 2 sialic acid residues. The disease is caused by variants affecting the gene represented in this entry. Belongs to the peptidase S1 family. Kallikrein subfamily.