Enables small GTPase binding activity and ubiquitin protein ligase binding activity. Involved in cellular response to vasopressin and response to axon injury. Located in several cellular components, including axon cytoplasm; cytoplasmic periphery of the nuclear pore complex; and mitotic spindle. Part of nuclear pore cytoplasmic filaments. Biomarker of sciatic neuropathy. Orthologous to human RANGAP1 (Ran GTPase activating protein 1). [provided by Alliance of Genome Resources, Apr 2022]