Predicted to enable acrosin binding activity and identical protein binding activity. Predicted to be a structural constituent of egg coat. Predicted to be involved in several processes, including acrosomal vesicle exocytosis; negative regulation of binding activity of sperm to zona pellucida; and positive regulation of acrosome reaction. Predicted to be located in egg coat. Orthologous to human ZP4 (zona pellucida glycoprotein 4). [provided by Alliance of Genome Resources, Apr 2022]