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Site-Specific Acetyl Lysine Antibodies Reveal Differential Regulation of Histone Acetylation upon Kinase Inhibition.
Cell Biochemistry and Biophysics 2017 March
Lysine acetylation regulates diverse biological functions for the modified proteins. Mass spectrometry-based proteomic approaches have identified thousands of lysine acetylation sites in cells and tissues. However, functional studies of these acetylation sites were limited by the lack of antibodies recognizing the specific modification sites. Here, we generated 55 site-specific acetyl lysine antibodies for the detection of this modification in cell lysates and evaluated the quality of these antibodies. Based on the immunoblotting analyses, we found that the nature of amino acid sequences adjacent to the modification sites affected the specificity of the site-specific acetyl lysine antibodies. Amino acids with charged, hydrophilic, small, or flexible side chains adjacent to the modification sites increase the likelihood of obtaining high quality site-specific acetyl lysine antibodies. This result may provide valuable insights in fine-tuning the amino acid sequences of the epitopes for the generation of site-specific acetyl lysine antibodies. Using the site-specific acetyl lysine antibodies, we further discovered that acetylation of histone 3 at four lysine residues was differentially regulated by kinase inhibitors. This result demonstrates the potential application of these antibodies in the study of new signaling pathways that lysine acetylation may participate in.
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