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- W4220677657 abstract "The hexameric Cdc48 ATPase (p97 or VCP in mammals) cooperates with its cofactor Ufd1/Npl4 to extract polyubiquitinated proteins from membranes or macromolecular complexes for degradation by the proteasome. Here, we clarify how the Cdc48 complex unfolds its substrates and translocates polypeptides with branchpoints. The Cdc48 complex recognizes primarily polyubiquitin chains rather than the attached substrate. Cdc48 and Ufd1/Npl4 cooperatively bind the polyubiquitin chain, resulting in the unfolding of one ubiquitin molecule (initiator). Next, the ATPase pulls on the initiator ubiquitin and moves all ubiquitin molecules linked to its C terminus through the central pore of the hexameric double ring, causing transient ubiquitin unfolding. When the ATPase reaches the isopeptide bond of the substrate, it can translocate and unfold both N- and C-terminal segments. Ubiquitins linked to the branchpoint of the initiator dissociate from Ufd1/Npl4 and move outside the central pore, resulting in the release of unfolded, polyubiquitinated substrate from Cdc48." @default.
- W4220677657 created "2022-04-03" @default.
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- W4220677657 date "2022-02-01" @default.
- W4220677657 modified "2023-10-01" @default.
- W4220677657 title "Translocation of polyubiquitinated protein substrates by the hexameric Cdc48 ATPase" @default.
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- W4220677657 doi "https://doi.org/10.1016/j.molcel.2021.11.033" @default.
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