Guanine nucleotide exchange factor (GEF) for Ral-A. Potential effector of GTPase HRas and Ras-related protein M-Ras. Negatively regulates Elk-1-dependent gene induction downstream of HRas and MEKK1. Interacts with GTP-bound forms of RIT1, HRAS and MRAS. Widely expressed. Expressed at high levels in the liver and kidney. The Ras-associating domain plays a central role in the activation of Ral-A GDP/GTP exchange activity.