Predicted to enable guanyl-nucleotide exchange factor activity. Predicted to be involved in Ras protein signal transduction. Predicted to act upstream of or within cell differentiation and small GTPase-mediated signal transduction. Predicted to be located in Golgi membrane; cytosol; and endoplasmic reticulum membrane. Predicted to be active in plasma membrane. Human ortholog(s) of this gene implicated in immunodeficiency 64. Orthologous to human RASGRP1 (RAS guanyl releasing protein 1).