May be involved sperm-egg plasma membrane adhesion and fusion during fertilization. Exhibits bacteriolytic activity in vitro against Micrococcus luteus and Staphylococcus aureus. Shows weak bacteriolytic activity against Gram-positive bacteria at physiological pH. Bacteriolytic activity is pH-dependent, with a maximum at around pH 5.6 (By similarity). Hydrolysis of (1->4)-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in a peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrins. Monomer. Detected in the postacrosomal area and midpiece of mature spermatozoa (PubMed:24013621). Expressed strongly in testis and epididymis and weakly in seminal vesicle, vas deferens, kidney and spleen (PubMed:24013621). Highly expressed in primary spermatocytes and round spermatids (at protein level) (PubMed:24013621). In testis expressed from day 21 during postnatal development (PubMed:24013621). In the epidydimis, first detected at day 28 and high expression is maintained until day 35. Thereafter, level declines gradually (PubMed:24013621). Belongs to the glycosyl hydrolase 22 family.