Enables GTPase activator activity and guanyl-nucleotide exchange factor activity. Predicted to be involved in activation of GTPase activity; positive regulation of axonogenesis; and small GTPase mediated signal transduction. Located in cytoplasm and membrane. Is expressed in several structures, including cartilage; central nervous system; genitourinary system; liver; and respiratory system. Orthologous to human TIAM2 (TIAM Rac1 associated GEF 2). [provided by Alliance of Genome Resources, Apr 2022]