May be involved in neurotransmitter secretion (PubMed:11029035). In association with the GTPase activator protein tbc-8 activates rab-2 during dense core vesicle maturation in cholinergic motoneurons (PubMed:22654674). Interacts with the GTPase activator protein tbc-8; the interaction is direct and may be required for the activation of rab-2 and dense vesicle maturation in cholinergic motoneurons (PubMed:22654674). Interacts with rund-1 (PubMed:24698274). Co-localizes with tbc-8 at cytoplasmic vesicle membranes in neurons. Expressed in all neurons (PubMed:11029035, PubMed:22654674). Highly expressed in m2 pharyngeal neurons and some pharyngeal interneurons (PubMed:11029035). Also expressed in the excretory canal and the gland cells located just below the nerve ring in the head (PubMed:11029035). Mutants are resistant to aldicarb, an inhibitor of acetylcholinesterase.