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 and mediate activation of CDC42 by the viral protein HPV16 E6. Interacts with ELMO2, EPHA2, RAC1 and RHOG; mediates activation of RAC1 by EPHA2. Interacts with TAX1BP3 (via PDZ domain). May interact with CDC42; stimulated by HPV16 E6. Up-regulated by HPV16 E6 (at protein level). The PDZ-binding motif mediates interaction with TAX1BP3. Truncated N-terminus.