Involved in vesicular trafficking at the Golgi apparatus level. Involved in endosome-to-Golgi trafficking. Interacts with RAB6A (PubMed:10209123). Directly interacts with TBC1D23 (PubMed:29084197). Interacts with FAM91A1; this interaction may be mediated by TBC1D23 (PubMed:29084197). Antibodies against GOLGA1 are present in sera from patients with Sjoegren syndrome. Sera from patients with Sjoegren syndrome often contain antibodies that react with normal components of the Golgi complex.