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. Homodimer. Interacts (via GRIP domain) with RAB6A (preferentially in its GTP-bound form). May interact (RAB6A-dependent) with ARL1; according to PubMed:19703403, RAB6A and ARL1 are not involved in GCC2 Golgi localization as proposed by PubMed:18243103. Interacts (probably via GRIP domain) with RAB9A (preferentially in its GTP-bound form). Interacts with CLASP1 and CLASP2; recruits both proteins to membranes of the TGN. Interacts with STX16. Ubiquitous. Extended rod-like protein with coiled-coil domains. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay. Wrong choice of CDS. Wrong choice of CDS. Extended N-terminus. Wrong choice of CDS.