Plays a role in endosome to Golgi protein trafficking; mediates protein transport along the late endosome-bypass pathway from the early endosome to the Golgi. Localizes to cis and medial Golgi cisternae. Probably cycles between early Golgi and distal compartments like endosome (By similarity). Expressed by spermatozoa (at protein level). Phosphorylated by c-AMP-dependent kinases most probably in its lumenal part. O-glycosylated; modified by sialic acid residues. N-glycosylated; N-glycans are of the complex type and modified by sialic acid residues. Belongs to the GOLIM4 family.