Sec16 is a multi-domain vesicle coat protein. This central region is the functional part of the molecules and thus is vital for the family's role in mediating the movement of protein-cargo between the organelles of the secretory pathway [1].

1: Yeast SEC16 gene encodes a multidomain vesicle coat protein that interacts with Sec23p. Espenshade P, Gimeno RE, Holzmacher E, Teung P, Kaiser CA; J Cell Biol. 1995;131:311-324. PMID:7593161