Tandem Affinity Purification Approach Coupled to Mass Spectrometry to Identify Post-translational Modifications of Histones Associated with Chromatin-Binding Proteins

Methods Mol Biol. 2017:1507:13-21. doi: 10.1007/978-1-4939-6518-2_2.


Protein purification by tandem affinity purification (TAP)-tag coupled to mass spectrometry analysis is usually used to reveal protein complex composition. Here we describe a TAP-tag purification of chromatin-bound proteins along with associated nucleosomes, which allow exhaustive identification of protein partners. Moreover, this method allows exhaustive identification of the post-translational modifications (PTMs) of the associated histones. Thus, in addition to partner characterization, this approach reveals the associated epigenetic landscape that can shed light on the function and properties of the studied chromatin-bound protein.

Keywords: Chromatin; Epigenetics; Histones; Mass spectrometry; Post-translational modifications; TAP-tag.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cells, Cultured
  • Chromatin / metabolism
  • Chromatography, Affinity
  • Histones / isolation & purification*
  • Histones / metabolism
  • Protein Processing, Post-Translational*
  • Tandem Mass Spectrometry


  • Chromatin
  • Histones