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EMBO Rep. 2018 Sep 24. pii: e45992. doi: 10.15252/embr.201845992. [Epub ahead of print]

A role for Mog1 in H2Bub1 and H3K4me3 regulation affecting RNAPII transcription and mRNA export.

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Gene expression and mRNA Metabolism Laboratory, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.
Gene expression and mRNA Metabolism Laboratory, Instituto de Biomedicina de Valencia, Consejo Superior de Investigaciones Científicas (CSIC), Valencia, Spain.
Departamento de Bioquímica y Biología Molecular and E.R.I. Biotecmed, Facultad de Biología, Universitat de València, Burjassot, Spain.
Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA.
School of Life and Environmental Sciences, Faculty of Science, Engineering and Built Environment, Centre for Cellular and Molecular Biology, Deakin University, Geelong, Vic., Australia.
Gene expression and mRNA Metabolism Laboratory, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain


Monoubiquitination of histone H2B (to H2Bub1) is required for downstream events including histone H3 methylation, transcription, and mRNA export. The mechanisms and players regulating these events have not yet been completely delineated. Here, we show that the conserved Ran-binding protein Mog1 is required to sustain normal levels of H2Bub1 and H3K4me3 in Saccharomyces cerevisiae Mog1 is needed for gene body recruitment of Rad6, Bre1, and Rtf1 that are involved in H2B ubiquitination and genetically interacts with these factors. We provide evidence that the absence of MOG1 impacts on cellular processes such as transcription, DNA replication, and mRNA export, which are linked to H2Bub1. Importantly, the mRNA export defect in mog1Δ strains is exacerbated by the absence of factors that decrease H2Bub1 levels. Consistent with a role in sustaining H2Bub and H3K4me3 levels, Mog1 co-precipitates with components that participate in these modifications such as Bre1, Rtf1, and the COMPASS-associated factors Shg1 and Sdc1. These results reveal a novel role for Mog1 in H2B ubiquitination, transcription, and mRNA biogenesis.


H2B ubiquitination; epigenetics; mRNA export; transcription; yeast


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