Core component of the TRAPP complexes which has a function of guanine nucleotide exchange factor activity for Rab1 GTPase. Plays a role in vesicular transport from endoplasmic reticulum to Golgi and autophagy (By similarity). May play a role in dendrite postsynaptic membrane trafficking (By similarity).
Subcellular locations: Postsynaptic cell membrane, Golgi apparatus membrane, Endoplasmic reticulum, Vesicle
Associated with postsynaptic membranes and in intracellular cisterns and vesicles (Golgi).