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Protein disulfide isomerase (PDI) catalyzes the formation of native disulfide pairings in secretory proteins. The ability of PDI to act as a disulfide isomerase makes it an essential enzyme in eukaryotes. PDI also fulfills other important roles. Recent studies have emphasized the importance of PDI as an oxidant in the endoplasmic reticulum. Intriguing questions remain regarding how PDI is able to catalyze both isomerization and oxidation in vivo. Studies of PDI and its homologues have led to the development of small-molecule folding catalysts that are able to accelerate disulfide isomerization in vitro and in vivo. PDI will continue to provide both an inspiration for the design of such artificial foldases and a benchmark with which to gauge the success of those designs. Here, we review current understanding of the chemistry and biology of PDI, its homologues, and small molecules that mimic its catalytic activity.

Catalysis of Protein Folding by Protein Disulfide Isomerase and Small-Molecule Mimics