Enables guanyl-nucleotide exchange factor activity and small GTPase binding activity. Involved in several processes, including marginal zone B cell differentiation; positive regulation of GTPase activity; and positive regulation of filopodium assembly. Is expressed in brain; female reproductive system; gut; skin; and spleen. Orthologous to human DOCK11 (dedicator of cytokinesis 11). [provided by Alliance of Genome Resources, Apr 2022]