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Okumura, Masaki; Noi, Kentaro; Inaba, Kenji
Current opinion in structural biology, February 2021, 2021-Feb, 2021-02-00, 20210201, Letnik: 66Journal Article
Time-resolved single-molecule observations by high-speed atomic force microscopy (HS-AFM), have greatly advanced our understanding of how proteins operate to fulfill their unique functions. Using this device, we succeeded in visualizing two members of the protein disulfide isomerase family (PDIs) that act to catalyze oxidative folding and reductive unfolding in the endoplasmic reticulum (ER). ERdj5, an ER-resident disulfide reductase that promotes ER-associated degradation, reduces nonnative disulfide bonds of misfolded proteins utilizing the dynamics of its N-terminal and C-terminal clusters. With unfolded substrates, canonical PDI assembles to form a face-to-face dimer with a central hydrophobic cavity and multiple redox-active sites to accelerate oxidative folding inside the cavity. Altogether, PDIs exert highly dynamic mechanisms to ensure the protein quality control in the ER.
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