Vectorial Import via a Metastable Disulfide-Linked Complex Allows for a Quality Control Step and Import by the Mitochondrial Disulfide Relay

？ IMS import by the disulfide relay proceeds via formation of a covalent intermediate ？ Import is driven by hydrophobic and disulfide-dependent interactions ？ The covalent intermediate is also formed by oxidation-incompetent substrates ？ Redox quality control allows for IMS substrate release and proteasomal degradatio