Membrane proteins are not delivered to membranes with complete efficiency and a portion can end up mislocalized to the cytosol. SGTA binds the hydrophobic regions of such mislocalized proteins that are exposed to the cytosol (Leznicki and High 2012, Xu et al. 2012, Wunderly et al. 2014, Shao et al. 2017). Client proteins of SGTA include both tail-anchored proteins destined for insertion into the endoplasmic reticulum membrane (Leznicki et al. 2013) and inappropriately localized proteins such as cytosolic PRNP (PrP) (Leznicki and High 2012), which is normally located in the plasma membrane. Mislocalized proteins bound by SGTA can be routed to the proteasome via ubiquitination by the BAG6 complex (BAG6:GET4:UBL4A) (Shao et al. 2017).