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Revealing Dynamic Protein Acetylation across Subcellular Compartments.

Josue Baeza1,2, Alexis J Lawton1,2, Jing Fan2,3

  • 1Biomolecular Chemistry Department, School of Medicine and Public Health, University of Wisconsin-Madison, 53706 Madison, Wisconsin, United States.

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Summary

This study developed a new method to quantify protein acetylation stoichiometry, revealing dynamic changes in response to growth factors. These dynamic acetylation patterns suggest key regulatory roles in cellular processes like translation and protein homeostasis.

Keywords:
acetylationacetylomedata-independent acquisitionmass spectrometryproteomestoichiometry

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Protein acetylation is a crucial post-translational modification involved in numerous cellular functions.
  • Identifying regulatory acetylation sites is challenging despite advances in mass spectrometry.
  • Understanding acetylation kinetics and stoichiometry is key to uncovering its functional roles.

Purpose of the Study:

  • To develop and validate an improved method for quantifying protein acetylation stoichiometry.
  • To map the dynamic landscape of acetylation stoichiometry within cellular compartments.
  • To investigate the temporal changes in site-specific acetylation in response to cellular stimuli.

Main Methods:

  • Development of an enhanced method for quantifying acetylation stoichiometry.
  • Application of the method to analyze dynamic acetylation in two human cell lines.
  • Utilizing mass spectrometry for site-specific acetylation analysis.

Main Results:

  • A detailed landscape of dynamic acetylation stoichiometry was generated.
  • Site-specific, temporal acetylation changes were observed in response to growth factor stimulation.
  • Diverse kinetic profiles of acetylation were identified, clustering into distinct groups.
  • Overlap in dynamic acetylation sites between cell lines indicated conserved regulatory control points in pathways like splicing and translation.
  • Increased acetylation on translational machinery suggests a positive regulatory role under progrowth conditions.
  • Higher median acetylation stoichiometry was found in compartments with known active acetyltransferases.

Conclusions:

  • The developed method provides a robust tool for studying dynamic acetylation stoichiometry.
  • Growth factor stimulation induces dynamic, site-specific acetylation changes with distinct kinetic profiles.
  • Conserved regulatory mechanisms of acetylation are involved in fundamental cellular processes across different cell types.
  • Acetylation plays a significant role in regulating protein translation under progrowth conditions.