Plays a role in the trafficking of cargo to dense-core vesicles, probably through association with the endosome-associated recycling protein (EARP) complex. Important for neuronal function. The cytoplasmic localization is supported by the over-expression of an eipr-1-GFP fusion protein. Expressed in the hypodermis and the pharynx. Defective egg-laying and slow, but coordinated locomotion when stimulated. Reduced levels of both unprocessed and processed luminal and transmembrane cargo in the motor neuron axons of the dorsal nerve cord. Double knockout with either rab-2, rund-1 or vps-50 results in reduced levels of both unprocessed and processed luminal and transmembrane cargo in the motor neuron axons of the dorsal nerve cord. Belongs to the WD repeat EIPR1 family. The subcellular location of endogenous eipr-1 could not be identified; diffuse expression of a eipr-1 construct in the cytoplasm may be an artifact due to over-expression of the construct.