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Structural basis of specific H2A K13/K15 ubiquitination by RNF168

Author

Listed:
  • Velten Horn

    (Leiden University
    Utrecht University)

  • Michael Uckelmann

    (Netherlands Cancer Institute
    Monash University)

  • Heyi Zhang

    (Leiden University
    Utrecht University)

  • Jelmer Eerland

    (Leiden University)

  • Ivette Aarsman

    (Netherlands Cancer Institute)

  • Ulric B. le Paige

    (Leiden University
    Utrecht University)

  • Chen Davidovich

    (Monash University
    EMBL-Australia and the ARC Centre of Excellence in Advanced Molecular Imaging)

  • Titia K. Sixma

    (Netherlands Cancer Institute)

  • Hugo van Ingen

    (Leiden University
    Utrecht University)

Abstract

Ubiquitination of chromatin by modification of histone H2A is a critical step in both regulation of DNA repair and regulation of cell fate. These very different outcomes depend on the selective modification of distinct lysine residues in H2A, each by a specific E3 ligase. While polycomb PRC1 complexes modify K119, resulting in gene silencing, the E3 ligase RNF168 modifies K13/15, which is a key event in the response to DNA double-strand breaks. The molecular origin of ubiquitination site specificity by these related E3 enzymes is one of the open questions in the field. Using a combination of NMR spectroscopy, crosslinking mass-spectrometry, mutagenesis and data-driven modelling, here we show that RNF168 binds the acidic patch on the nucleosome surface, directing the E2 to the target lysine. The structural model highlights the role of E3 and nucleosome in promoting ubiquitination and provides a basis for understanding and engineering of chromatin ubiquitination specificity.

Suggested Citation

  • Velten Horn & Michael Uckelmann & Heyi Zhang & Jelmer Eerland & Ivette Aarsman & Ulric B. le Paige & Chen Davidovich & Titia K. Sixma & Hugo van Ingen, 2019. "Structural basis of specific H2A K13/K15 ubiquitination by RNF168," Nature Communications, Nature, vol. 10(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09756-z
    DOI: 10.1038/s41467-019-09756-z
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