May play a role in vesicular transport from endoplasmic reticulum to Golgi. Part of the multisubunit TRAPP (transport protein particle) complex. Schizont membrane, internal surface of parasitized erythrocytes and on membranous structures in the erythrocyte cytoplasm. Expressed during the parasite blood stage, specifically in schizonts and free merozoites (at protein level). Blood stage antigen transported to the erythrocyte surface. Belongs to the TRAPP small subunits family. BET3 subfamily.