Is predicted to encode a protein with the following domains: Rab-GTPase-TBC domain superfamily; RUN domain superfamily; RUN domain; Small G protein signalling modulator 1/2, Rab-binding domain; Rab-GTPase-TBC domain; and Rab-binding domain (RBD). Is an ortholog of C. elegans tbc-8. In C. elegans, tbc-8 is involved in dense core granule maturation.