Enables metalloaminopeptidase activity; peptide binding activity; and transition metal ion binding activity. Involved in several processes, including aging; negative regulation of blood pressure; and retina development in camera-type eye. Located in several cellular components, including Golgi apparatus; external side of plasma membrane; and secretory granule. Used to study hypertension. Biomarker of hypertension. Orthologous to human RNPEP (arginyl aminopeptidase). [provided by Alliance of Genome Resources, Apr 2022]