Predicted to enable co-receptor binding activity and receptor antagonist activity. Involved in negative regulation of testosterone biosynthetic process; penetration of zona pellucida; and positive regulation of apoptotic process. Acts upstream of or within positive regulation of fat cell differentiation. Located in acrosomal vesicle. Is expressed in several structures, including extraembryonic component and reproductive system. Orthologous to human DKKL1 (dickkopf like acrosomal protein 1). [provided by Alliance of Genome Resources, Apr 2022]