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. Author manuscript; available in PMC: 2016 Aug 12.
Published in final edited form as: Mol Microbiol. 2015 Sep 25;98(6):1037–1050. doi: 10.1111/mmi.13172

Fig. 7.

Fig. 7

A model of MdbA-mediated posttranslocational protein folding. The transmembrane thiol-disulfide oxidoreductase MbdA enzyme forms a mixed disulfide bond with nascent precursors emerging from the Sec translocon, allowing the precursors to fold into a near-native state before MdbA-driven catalysis of disulfide bond formation, resulting in fully folded proteins for subsequent steps. An unidentified membrane-bound oxidoreductase termed MdbB is proposed to reoxidize MdbA.