Enables GTPase binding activity. Involved in several processes, including positive regulation of type B pancreatic cell proliferation; response to cAMP; and response to estrogen. Located in several cellular components, including axon terminus; neuronal cell body; and secretory granule. Colocalizes with Golgi apparatus; endosome; and plasma membrane. Used to study type 1 diabetes mellitus. Human ortholog(s) of this gene implicated in type 1 diabetes mellitus. Orthologous to human PTPRN (protein tyrosine phosphatase receptor type N). [provided by Alliance of Genome Resources, Apr 2022]