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The mechanisms of disulfide bond formation in the periplasm. One of the disulfide bond donors in the periplasm is DsbA, which is oxidized by DsbB and this oxidizing reaction needs respiratory quinone component. Whenever there is more than two cysteine, the incorrect disulfide bond may occur. For preventing that, the disulfide bond isomerase DsbC comes to the rescue and it is oxidized by DsbD.
