Guanine nucleotide-releasing protein (By similarity). Together with GTPase drn-1, may regulate acetylcholine release at the neuromuscular junctions probably downstream of G-protein gsa-1 and adenylate cyclase acy-1 (PubMed:22897658). Interacts (via C-terminus) with drn-1. Expressed specifically in neurons including the nerve ring, ventral and dorsal nerve cord motor neurons and tail ganglia.