Enables epidermal growth factor receptor binding activity and guanyl-nucleotide exchange factor activity. Acts upstream of or within several processes, including integrin-mediated signaling pathway; neutrophil chemotaxis; and positive regulation of phosphatidylinositol 3-kinase activity. Located in cytoplasm and plasma membrane. Is expressed in several structures, including alimentary system; central nervous system; limb segment; metanephros; and sensory organ. Orthologous to human VAV3 (vav guanine nucleotide exchange factor 3). [provided by Alliance of Genome Resources, Apr 2022]