Enables enzyme regulator activity. Involved in regulation of GTPase activity. Predicted to be located in cytosol and plasma membrane. Predicted to be part of protein-containing complex. Human ortholog(s) of this gene implicated in Martsolf syndrome and Warburg micro syndrome 2. Orthologous to human RAB3GAP2 (RAB3 GTPase activating non-catalytic protein subunit 2). [provided by Alliance of Genome Resources, Apr 2022]