Predicted to enable protein tyrosine phosphatase activity. Involved in negative regulation of GTPase activity. Located in endoplasmic reticulum lumen; secretory granule; and terminal bouton. Is integral component of synaptic vesicle membrane. Human ortholog(s) of this gene implicated in prediabetes syndrome and type 1 diabetes mellitus. Orthologous to human PTPRN2 (protein tyrosine phosphatase receptor type N2). [provided by Alliance of Genome Resources, Apr 2022]