Tail-anchored trans-membrane proteins are targeted to membranes post-translationally. The proteins Get4 and Get5 form an obligate complex that catalyzes the transfer of tail-anchored proteins destined to the endoplasmic reticulum from Sgt2 to the cytosolic targeting factor Get3. This is the carboxyl domain of Get5 (Get5-C), a homodimerisation domain, resulting in a heterotetrameric Get4/Get5 complex [1].

1: Get5 carboxyl-terminal domain is a novel dimerization motif that tethers an extended Get4/Get5 complex. Chartron JW, VanderVelde DG, Rao M, Clemons WM Jr; J Biol Chem. 2012;287:8310-8317. PMID:22262836