The members of this family (Anp1, Van1 and Mnn9) are membrane proteins required for proper Golgi function. These proteins co-localise within the cis Golgi, and that they are physically associated in two distinct complexes[1].

1: Multi-protein complexes in the cis Golgi of Saccharomyces cerevisiae with alpha-1,6-mannosyltransferase activity. Jungmann J, Munro S; EMBO J 1998;17:423-434. PMID:9430634