Golgin which probably tethers transport vesicles to the trans-Golgi network (TGN) and regulates vesicular transport between the endosomes and the Golgi. As a RAB9A effector it is involved in recycling of the mannose 6-phosphate receptor from the late endosomes to the TGN. May also play a role in transport between the recycling endosomes and the Golgi. Required for maintenance of the Golgi structure, it is involved in the biogenesis of noncentrosomal, Golgi-associated microtubules through recruitment of CLASP1 and CLASP2 (By similarity). Homodimer. Interacts (via GRIP domain) with RAB6A (preferentially in its GTP-bound form). May interact (RAB6A-dependent) with ARL1; might be involved in GCC2 Golgi localization. Interacts with CLASP1 and CLASP2; recruits both proteins to membranes of the TGN. Interacts with STX16 (By similarity). Interacts (probably via GRIP domain) with RAB9A (preferentially in its GTP-bound form). Extended rod-like protein with coiled-coil domains.