Acrosin Acrosin heavy chain 415 MLPTAVLLVLAVSVAARDNATCDGPCGLRFRQKLESGMRVVGGMSAEPGAWPWMVSLQIFMYHNNRRYHTCGGILLNSHWVLTAAHCFKNKKKVTDWRLIFGANEVVWGSNKPVKPPLQERFVEEIIIHEKYVSGLEINDIALIKITPPVPCGPFIGPGCLPQFKAGPPRAPQTCWVTGWGYLKEKGPRTSPTLQEARVALIDLELCNSTRWYNGRIRSTNVCAGYPRGKIDTCQGDSGGPLMCRDRAENTFVVVGITSWGVGCARAKRPGVYTSTWPYLNWIASKIGSNALQMVQLGTPPRPSTPAPPVRPPSVQTPVRPPWYFQRPPGPSQQPGSRPRPPAPPPAPPPPPPPPPPPPPPPPPPPQQVSAKPPQALSFAKRLQQLIEALKGTAFSSGRSYYETETTDLQELPAS ACR 53 kDa fucose-binding protein Acrosin light chain ACRO_PIG Acrosin is the major protease of mammalian spermatozoa. It is a serine protease of trypsin-like cleavage specificity, it is synthesized in a zymogen form, proacrosin and stored in the acrosome.