Enables several functions, including guanyl-nucleotide exchange factor activity; microtubule binding activity; and signaling receptor binding activity. Involved in several processes, including activation of GTPase activity; brain-derived neurotrophic factor receptor signaling pathway; and regulation of dopaminergic neuron differentiation. Acts upstream of or within ephrin receptor signaling pathway; positive regulation of axonogenesis; and small GTPase mediated signal transduction. Located in kinocilium; pericentriolar material; and plasma membrane. Is expressed in several structures, including alimentary system; embryo ectoderm; gonad; sensory organ; and skin. Orthologous to human TIAM1 (TIAM Rac1 associated GEF 1). [provided by Alliance of Genome Resources, Apr 2022]