Acetylation of the transcriptional repressor Ume6p allows efficient promoter release and timely induction of the meiotic transient transcription program in yeast

Michael J. Law, Michael J. Mallory, Roland L. Mallory, Randy Strich

    Research output: Contribution to journalArticlepeer-review

    15 Scopus citations

    Abstract

    Differentiation programs require strict spatial and temporal control of gene transcription. Genes expressed during meiotic development in Saccharomyces cerevisiae display transient induction and repression. Early meiotic gene (EMG) repression during mitosis is achieved by recruiting both histone deacetylase and chromatin remodeling complexes to their promoters by the zinc cluster DNA binding protein Ume6p. Ume6p repression is relieved by ubiquitin-mediated destruction that is stimulated by Gcn5p-induced acetylation. In this report, we demonstrate that Gcn5p acetylation of separate lysines within the zinc cluster domain negatively impacts Ume6p DNA binding. Mimicking lysine acetylation using glutamine substitution mutations decreased Ume6p binding efficiency and resulted in partial derepression of Ume6p-regulated genes. Consistent with this result, molecular modeling predicted that these lysine side chains are adjacent to the DNA phosphate backbone, suggesting that acetylation inhibits Ume6p binding by electrostatic repulsion. Preventing acetylation did not impact final EMG induction levels during meiosis. However, a delay in EMG induction was observed, which became more severe in later expression classes, ultimately resulting in delayed and reduced execution of the meiotic nuclear divisions. These results indicate that Ume6p acetylation ensures the proper timing of the transient transcription program during meiotic development.

    Original languageEnglish (US)
    Pages (from-to)631-642
    Number of pages12
    JournalMolecular and Cellular Biology
    Volume34
    Issue number4
    DOIs
    StatePublished - Feb 2014

    All Science Journal Classification (ASJC) codes

    • Molecular Biology
    • Cell Biology

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