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EMBO Rep. 2019 Oct 4;20(10):e48111. doi: 10.15252/embr.201948111. Epub 2019 Aug 29.

H3K14 ubiquitylation promotes H3K9 methylation for heterochromatin assembly.

Author information

1
Graduate School of Natural Sciences, Nagoya City University, Nagoya, Japan.
2
Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.
3
Laboratory for Phyloinformatics, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan.
4
Division of Chromatin Regulation, National Institute for Basic Biology, Okazaki, Japan.
5
Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan.
6
Cellular Memory Laboratory, RIKEN, Wako, Japan.
7
Laboratory of Chromatin Structure and Function, Institute for Quantitative Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
8
Department of Basic Biology, School of Life Science, The Graduate University for Advanced Studies (SOKENDAI), Okazaki, Japan.

Abstract

The methylation of histone H3 at lysine 9 (H3K9me), performed by the methyltransferase Clr4/SUV39H, is a key event in heterochromatin assembly. In fission yeast, Clr4, together with the ubiquitin E3 ligase Cul4, forms the Clr4 methyltransferase complex (CLRC), whose physiological targets and biological role are currently unclear. Here, we show that CLRC-dependent H3 ubiquitylation regulates Clr4's methyltransferase activity. Affinity-purified CLRC ubiquitylates histone H3, and mass spectrometric and mutation analyses reveal that H3 lysine 14 (H3K14) is the preferred target of the complex. Chromatin immunoprecipitation analysis shows that H3K14 ubiquitylation (H3K14ub) is closely associated with H3K9me-enriched chromatin. Notably, the CLRC-mediated H3 ubiquitylation promotes H3K9me by Clr4, suggesting that H3 ubiquitylation is intimately linked to the establishment and/or maintenance of H3K9me. These findings demonstrate a cross-talk mechanism between histone ubiquitylation and methylation that is involved in heterochromatin assembly.

KEYWORDS:

epigenetic gene silencing; fission yeast; heterochromatin; histone methylation; histone ubiquitylation

PMID:
31468675
PMCID:
PMC6776926
[Available on 2020-10-04]
DOI:
10.15252/embr.201948111

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