Guanyl-nucleotide exchange factor of the RHOG GTPase stimulating the exchange of RHOG-associated GDP for GTP. May play a role in chemotactic cell migration by mediating the activation of RAC1 by EPHA2. May also activate CDC42 (By similarity). Interacts with ELMO2, EPHA2, RAC1 and RHOG; mediates activation of RAC1 by EPHA2. Interacts with TAX1BP3 (via PDZ domain) (By similarity). The PDZ-binding motif mediates interaction with TAX1BP3. Extended N-terminus.