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Ubiquitin utilizes an acidic surface patch to alter chromatin structure.

Galia T Debelouchina1, Karola Gerecht1,2, Tom W Muir1

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey, USA.

Nature Chemical Biology
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Histone H2B ubiquitylation decompacts chromatin via an acidic patch on ubiquitin (Ub). This patch interacts with histones, acting as a wedge and promoting ubiquitin-ubiquitin contacts for chromatin solubilization.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Epigenetics

Background:

  • Histone H2B ubiquitylation is linked to gene activation and chromatin decompaction.
  • The precise mechanism by which ubiquitylation induces chromatin structural changes remains largely unknown.

Purpose of the Study:

  • To identify the specific ubiquitin surface responsible for chromatin decompaction.
  • To elucidate the molecular mechanism underlying ubiquitin's effect on chromatin structure.

Main Methods:

  • Hydrogen-deuterium exchange coupled with NMR spectroscopy to map ubiquitin-chromatin interactions.
  • Crosslinking strategies and oligomerization assays to study ubiquitin-ubiquitin contacts in chromatin.

Main Results:

  • An uncharacterized acidic patch (Glu16, Glu18) on ubiquitin is essential for chromatin decompaction.
  • This acidic patch mediates electrostatic interactions with histone proteins, potentially acting as a wedge.
  • Ubiquitin-ubiquitin contacts within the chromatin environment are crucial for chromatin polymer solubilization.

Conclusions:

  • The study reveals a novel mechanism for ubiquitin-mediated chromatin decompaction involving specific ubiquitin surface features.
  • Highlights the role of electrostatic interactions and ubiquitin-ubiquitin contacts in regulating chromatin structure.
  • Expands understanding of the 'ubiquitin code' and its diverse roles in cellular processes.