Small glutamine-rich tetratricopeptide repeat-containing protein alpha (SGTA)

Co-chaperone that binds misfolded and hydrophobic patches-containing client proteins in the cytosol. Mediates their targeting to the endoplasmic reticulum but also regulates their sorting to the proteasome when targeting fails (PubMed:28104892).

Functions in tail-anchored/type II transmembrane proteins membrane insertion constituting with ASNA1 and the BAG6 complex a targeting module (PubMed:28104892). Functions upstream of the BAG6 complex and ASNA1, binding more quickly the transmembrane domain of newly synthesized proteins (PubMed:28104892, PubMed:25535373).