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Programmed ubiquitin acetylation using genetic code expansion reveals altered ubiquitination patterns.

Rachel E Lacoursiere1, Patrick O'Donoghue1,2, Gary S Shaw1

  • 1Department of Biochemistry, The University of Western Ontario, London, Canada.

FEBS Letters
|December 4, 2019
PubMed
Summary

Researchers created all acetylated ubiquitin (acUb) variants to study their function. This method enables the investigation of unique ubiquitination patterns, advancing our understanding of post-translational modifications.

Keywords:
acetyl-lysineorthogonal translationpost-translational modificationubiquitination

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Ubiquitination is a crucial post-translational modification (PTM) that regulates numerous cellular processes.
  • Acetylation is another PTM known to influence ubiquitination, yet the specific roles of acetylated ubiquitin (acUb) remain largely unknown.
  • The transient nature and limited characterization of acUb variants in vitro hinder in-depth study.

Purpose of the Study:

  • To develop a method for producing all possible acetylated ubiquitin (acUb) variants.
  • To characterize the functional capabilities of these acUb variants in ubiquitination assays.
  • To enable the identification of unique ubiquitination patterns mediated by acUb.

Main Methods:

  • Genetic code expansion was employed to synthesize all potential acUb variants.
  • An optimized protocol was developed for site-specific acetyl-lysine addition, minimizing mistranslation.
  • Purified acUb proteins were utilized in ubiquitination assays with specific E3 ligases.

Main Results:

  • All acetyl-lysine variants of ubiquitin were successfully produced and purified.
  • The produced acUb proteins demonstrated competence in ubiquitination reactions with IpaH3CT and RNF8 E3 ligases.
  • The study established a foundation for exploring novel ubiquitination patterns.

Conclusions:

  • An efficient method for expressing and purifying all acetylated ubiquitin variants has been established.
  • These acUb variants are functional and can be utilized in biochemical assays.
  • This work opens new avenues for investigating the regulatory roles of acetylated ubiquitin in cellular signaling.