The function of ZPBP (zona pellucida binding protein, Ensembl gene identifier ENSG00000042813) is as follows. Plays a role in acrosome compaction and sperm morphogenesis (PubMed:21911476). Is implicated in sperm-oocyte interaction during fertilization (By similarity). {ECO:0000250|UniProtKB:Q62522, ECO:0000269|PubMed:21911476}.