Enables protein C-terminus binding activity; receptor tyrosine kinase binding activity; and small GTPase binding activity. Involved in several processes, including activation of GTPase activity; cellular response to insulin stimulus; and response to amphetamine. Located in several cellular components, including apical dendrite; apicolateral plasma membrane; and basolateral plasma membrane. Orthologous to human RASGRF1 (Ras protein specific guanine nucleotide releasing factor 1). [provided by Alliance of Genome Resources, Apr 2022]