Vps55 is involved in the secretion of the Golgi form of the soluble vacuolar carboxypeptidase Y, but not the trafficking of the membrane-bound vacuolar alkaline phosphatase. Both Vps55 and obesity receptor gene-related protein are important for functioning membrane trafficking to the vacuole/lysosome of eukaryotic cells [1].

1: Yeast Vps55p, a Functional Homolog of Human Obesity Receptor Gene-related Protein, Is Involved in Late Endosome to Vacuole Trafficking. Belgareh-Touze N, Avaro S, Rouille Y, Hoflack B, Haguenauer-Tsapis R; Mol Biol Cell 2002;13:1694-1708. PMID:12006663