Also known as General vesicular transport factor, Transcytosis associate protein (TAP) and Vesicle docking protein, this myosin-shaped molecule consists of an N-terminal globular head region, a coiled-coil tail which mediates dimerisation, and a short C-terminal acidic region [1]. p115 tethers COP1 vesicles to the Golgi by binding the coiled coil proteins giantin (on the vesicles) and GM130 (on the Golgi), via its C-terminal acidic region. It is required for intercisternal transport in the golgi stack. This family consists of the acidic C-terminus, which binds to the golgins giantin and GM130. p115 is thought to juxtapose two membranes by binding giantin with one acidic region, and GM130 with another [2].

1: Sequential tethering of Golgins and catalysis of SNAREpin assembly by the vesicle-tethering protein p115. Shorter J, Beard MB, Seemann J, Dirac-Svejstrup AB, Warren G; J Cell Biol 2002;157:45-62. PMID:11927603

2: Vesicle tethering complexes in membrane traffic. Whyte JR, Munro S; J Cell Sci 2002;115:2627-2637. PMID:12077354