Enhances the promotion of guanine-nucleotide exchange by PSCD2 on ARF6 in a concentration-dependent manner. Interacts with guanine-nucleotide exchange factors PSCD1, PSCD2, PSCD3 and PSCD4. Translocated with PSCD2 to the plasma membrane upon epidermal growth factor (EGF) stimulation. Expressed in brain, spleen, lung, testis and kidney.