Site-Specific Identification of Lysine Acetylation Stoichiometries in Mammalian Cells

Journal of Proteome Research
Tong ZhouYue Chen

Abstract

Functional characterization of the lysine acetylation pathway requires quantitative measurement of the modification abundance at the stoichiometry level. Here, we developed a systematic workflow for global untargeted identification of site-specific Lys acetylation stoichiometries in mammalian cells. Our strategy includes an optimized protocol for in vitro chemical labeling of unmodified lysine with stable isotope-encoded acetyl-NHS ester, deep proteomic profiling with a high resolution mass spectrometer, and a new software tool for quantitative analysis and stoichiometry determination. The workflow was validated using in vitro chemically labeled BSA and synthetic peptides with multiple Lys acetylations at various positions. In the proof-of-concept study, we applied the strategy to analyze the proteome of HeLa cells and determined the stoichiometries of over 600 acetylation sites with good reproducibility. Sodium butyrate treatment induced a significant increase of acetylation stoichiometries in HeLa cells. Analysis of site-specific stoichiometry dynamics revealed the coregulation of closely positioned acetylation sites on histones H3 and H4 upon treatment.

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