Enables zinc ion binding activity. Involved in several processes, including negative regulation of cell death; regulation of cellular macromolecule biosynthetic process; and transition metal ion homeostasis. Acts upstream of or within cellular metal ion homeostasis and negative regulation of neurogenesis. Located in synaptic vesicle. Is expressed in brain; decidua; ganglia; ventral grey horn; and ventricular layer. Human ortholog(s) of this gene implicated in Alzheimer's disease. Orthologous to human MT3 (metallothionein 3). [provided by Alliance of Genome Resources, Apr 2022]