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and 2) an unstructured region of about 25 amino acids. Proteins that lack this unstructured region can have another motor, cdc48 in yeast or P97 in humans, generate this unstructured region by a unique mechanism where ubiquitin is unfolded by cdc48 and its cofactors Npl4/Ufd1. The tagging of a target protein by ubiquitin is catalyzed by cascade of enzymes consisting of the Ubiquitin-activating enzyme (E1), Ubiquitin-conjugating enzyme (E2),

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