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Journal Article
Review
The evolving world of ubiquitin: transformed polyubiquitin chains.
Biomolecular Concepts 2016 June 2
The regulation of diverse cellular events by proteins that have undergone post-translational modification with ubiquitin is well documented. Ubiquitin can be polymerized and eight types of polyubiquitin chain contribute to the complexity and specificity of the ubiquitin signal. Unexpectedly, recent studies have shown that ubiquitin itself undergoes post-translational modification by acetylation and phosphorylation; moreover, amyloid-like fibrils comprised of polyubiquitin chains have been discovered. Thus, ubiquitin is not only conjugated to substrate proteins, but also modified and transformed itself. Here, we review these novel forms of ubiquitin signal, with a focus on fibril formation of polyubiquitin chains and its underlying biological relevance.
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