Function
The mammalian zona pellucida, which mediates species-specific sperm binding, induction of the acrosome reaction and prevents post-fertilization polyspermy, is composed of three to four glycoproteins, ZP1, ZP2, ZP3, and ZP4. ZP4 may act as a sperm receptor.
Sequence
MWLLQPLLLCVPLSLAVHGQQKPQVPDYPGELHCGLQSLQFAINPSPGKATPALIVWDNRGLPHKLQNNSGCGTWVRESPGGSVLLDASYSSCYVNEWVSTTQSPGTSRPPTPASRVTPQDSHYVMIVGVEGTDAAGRRVTNTKVLRCPRNPPDQALVSSLSPSPLQNVALEAPNADLCDSVPKWDRLPCASSPITQGDCNKLGCCYKSEANSCYYGNTVTSRCTQDGHFSIAVSRNVTSPPLLLNSLRLAFGKDRECNPVKATRAFALFFFPFNSCGTTRWVTGDQAVYENELVAARDVRTWSHGSITRDSIFRLRVSCSYSVRSNAFPLSVQVFTIPPPHLKTQHGPLTLELKIAKDKHYGSYYTIGDYPVVKLLRDPIYVEVSIRHRTDPSLGLLLHNCWATPGKNSQSLSQWPILVKGCPYVGDNYQTQLIPVQKALDTPFPSYYKRFSIFTFSFVDTMAKWALRGPVYLHCNVSICQPAGTSSCRITCPVARRRRHSDLHHHSSTASISSKGPMILLQATMDSAEKLHKNSSSPIDSQALWMAGLSGTLIFGFLLVSYLAIRKRR