Enables cAMP binding activity and transmembrane transporter binding activity. Involved in several processes, including animal organ development; positive regulation of cation transmembrane transport; and positive regulation of nitrogen compound metabolic process. Located in several cellular components, including basolateral part of cell; brush border membrane; and distal axon. Colocalizes with cortical actin cytoskeleton and plasma membrane. Orthologous to human RAPGEF3 (Rap guanine nucleotide exchange factor 3). [provided by Alliance of Genome Resources, Apr 2022]