PACS-1 is a cytosolic sorting protein that directs the localisation of membrane proteins in the trans-Golgi network (TGN)/endosomal system. PACS-1 connects the clathrin adaptor AP-1 to acidic cluster sorting motifs contained in the cytoplasmic domain of cargo proteins such as furin, the cation-independent mannose-6-phosphate receptor and in viral proteins such as human immunodeficiency virus type 1 Nef [1].

1: PACS-1 defines a novel gene family of cytosolic sorting proteins required for trans-Golgi network localization. Wan L, Molloy SS, Thomas L, Liu G, Xiang Y, Rybak SL, Thomas G; Cell. 1998;94:205-216. PMID:9695949