Predicted to enable guanyl-nucleotide exchange factor activity. Predicted to be involved in exocytosis. Predicted to be located in Golgi to plasma membrane transport vesicle. Expressed in hypodermis; vulA; vulB1; vulB2; and vulval muscle. Is an ortholog of human RAB3IL1 (RAB3A interacting protein like 1) and RAB3IP (RAB3A interacting protein).