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The increasing complexity of the ubiquitin code

Abstract

Ubiquitylation is essential for signal transduction as well as cell division and differentiation in all eukaryotes. Substrate modifications range from a single ubiquitin molecule to complex polymeric chains, with different types of ubiquitylation often eliciting distinct outcomes. The recent identification of novel chain topologies has improved our understanding of how ubiquitylation establishes precise communication within cells. Here, we discuss how the increasing complexity of ubiquitylation is employed to ensure robust and faithful signal transduction in eukaryotic cells.

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Figure 1: Signalling by monoubiquitylation.
Figure 2: Signalling by homotypic ubiquitin chains.
Figure 3: Signalling by heterotypic ubiquitin chains.
Figure 4: Signalling by modified ubiquitin.

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Acknowledgements

We apologize to all colleagues whose work we were unable to include due to space constraints. We thank J. Schaletzky, A. Manford and A. Werner for reading this manuscript, and we are grateful to all members of our lab for many inspired discussions about the roles of ubiquitin in cell signalling. We also thank J. Campbell for discussions on the principles of communication. Work in our lab is funded by grants from the National Institutes of Health. M.R. is the K. Peter Hirth Chair of Cancer Biology at UC Berkeley and an Investigator of the Howard Hughes Medical Institute.

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Correspondence to Michael Rape.

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M.R. is co-founder and consultant to Nurix, a biotechnology company that operates in the ubiquitin space.

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Yau, R., Rape, M. The increasing complexity of the ubiquitin code. Nat Cell Biol 18, 579–586 (2016). https://doi.org/10.1038/ncb3358

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