Involved in vesicular trafficking at the Golgi apparatus level. May play a role in delivery of transport vesicles containing GPI-linked proteins from the trans-Golgi network through its interaction with MACF1. Involved in endosome-to-Golgi trafficking. Homodimer. Interacts with GTP-bound ARL1 and ARL3 (By similarity). Interacts with MACF1 (By similarity). Directly interacts with TBC1D23 (PubMed:29084197). Interacts with FAM91A1; this interaction may be mediated by TBC1D23 (By similarity). Ubiquitous. Highly expressed in oligodendrocyte precursors, particularly at a stage just prior to myelination. Extended rod-like protein with coiled-coil domains. Truncated N-terminus.