Predicted to enable GDP-dissociation inhibitor activity; identical protein binding activity; and small GTPase binding activity. Predicted to be involved in several processes, including negative regulation of GTPase activity; negative regulation of TOR signaling; and protein localization to lysosome. Predicted to act upstream of or within endocytosis. Predicted to be located in clathrin-coated pit; cytoplasmic vesicle; and nucleus. Predicted to be active in cytoplasm. Is expressed in cerebral cortex marginal layer and olfactory cortex marginal layer. Orthologous to human SH3BP4 (SH3 domain binding protein 4). [provided by Alliance of Genome Resources, Apr 2022]