Ubiquitin and ubiquitin-like proteins as multifunctional signals

@article{Welchman2005UbiquitinAU,
  title={Ubiquitin and ubiquitin-like proteins as multifunctional signals},
  author={Rebecca L. Welchman and Colin Gordon and Robert J Mayer},
  journal={Nature Reviews Molecular Cell Biology},
  year={2005},
  volume={6},
  pages={599-609}
}
Protein ubiquitylation is a recognized signal for protein degradation. However, it is increasingly realized that ubiquitin conjugation to proteins can be used for many other purposes. Furthermore, there are many ubiquitin-like proteins that control the activities of proteins. The central structural element of these post-translational modifications is the ubiquitin superfold. A common ancestor based on this superfold has evolved to give various proteins that are involved in diverse activities in… 

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