Also known as General vesicular transport factor, Transcytosis associated 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 part of the head region. The head region is highly conserved, but its function is unknown. It does not seem to be essential for vesicle tethering [1]. The N-terminal part of the head region, not within this family, contains context-detected Armadillo/beta-catenin-like repeats (Pfam:PF00514).

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