Enables GTPase activator activity and small GTPase binding activity. Involved in Golgi to plasma membrane transport and axonogenesis. Located in Golgi cis cisterna; early endosome membrane; and trans-Golgi network membrane. Colocalizes with axon. Orthologous to human LLGL1 (LLGL scribble cell polarity complex component 1). [provided by Alliance of Genome Resources, Apr 2022]