Predicted to enable guanyl-nucleotide exchange factor activity. Involved in activation of GTPase activity; regulation of small GTPase mediated signal transduction; and synapse organization. Is active in GABA-ergic synapse. Orthologous to human IQSEC3 (IQ motif and Sec7 domain ArfGEF 3). [provided by Alliance of Genome Resources, Apr 2022]