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Genetically Incorporating Two Distinct Post-translational Modifications into One Protein Simultaneously.

Sumana Venkat1, Jourdan Sturges1, Alleigh Stahman1

  • 1Department of Chemistry and Biochemistry, ‡Cell and Molecular Biology Program, and §Department of Biological Sciences, University of Arkansas , Fayetteville, Arkansas 72701, United States.

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Summary

Researchers simultaneously incorporated multiple post-translational modifications (PTMs) like acetylation and phosphorylation into proteins. This breakthrough enables studying how combined PTMs affect protein function and structure.

Keywords:
acetylationgenetic code expansionnoncanonical amino acidphosphorylationpost-translational modification

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Biology

Background:

  • Post-translational modifications (PTMs) are crucial for regulating biological processes.
  • Current methods allow incorporating single PTMs, but PTMs often function synergistically.
  • Simultaneous incorporation of multiple PTMs is needed to understand their combined effects.

Purpose of the Study:

  • To develop a method for simultaneous genetic incorporation of distinct PTMs into proteins.
  • To investigate the effects of coexisting acetylation and phosphorylation on protein function.
  • To assess the feasibility of incorporating three or more PTMs concurrently.

Main Methods:

  • Utilized genetic incorporation systems for phosphoserine and acetyllysine in Escherichia coli.
  • Co-expressed modified amino acids to achieve simultaneous protein phosphorylation and acetylation.
  • Applied the system to study malate dehydrogenase and tested the orthogonality of multiple genetic incorporation systems.

Main Results:

  • Successfully achieved simultaneous incorporation of phosphorylation and acetylation into target proteins.
  • Demonstrated a practical application in studying the combined effects of PTMs on malate dehydrogenase.
  • Showcased the potential for incorporating three distinct PTMs by testing system orthogonality.

Conclusions:

  • The developed system enables simultaneous dual PTM incorporation, advancing PTM research.
  • This methodology provides a powerful tool for biochemical studies on synergistic PTM effects.
  • The findings pave the way for incorporating multiple PTMs simultaneously, expanding the scope of protein engineering.