Figure 3.
An example of a PDI-first pathway in oxidative protein folding. In the first phase the unfolded reduced protein is oxidized by PDIox. Here, reduced PDI is regenerated by the FAD-linked sulfhydryl oxidase, Ero1, with the formation of hydrogen peroxide. PDIred is then involved in correction of mispaired disulfides prior to the iterative emergence of the native protein fold.