title: Histone sumoylation is a negative regulator in Saccharomyces cerevisiae and shows dynamic interplay with positive-acting histone modifications.
abstract: Covalent histone post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitylation play pivotal roles in regulating many cellular processes, including transcription, response to DNA damage, and epigenetic control. Although positive-acting post-translational modifications have been studied in Saccharomyces cerevisiae, histone modifications that are associated with transcriptional repression have not been shown to occur in this yeast. Here, we provide evidence that histone sumoylation negatively regulates transcription in S. cerevisiae. We show that all four core histones are sumoylated and identify specific sites of sumoylation in histones H2A, H2B, and H4. We demonstrate that histone sumoylation sites are involved directly in transcriptional repression. Further, while histone sumoylation occurs at all loci tested throughout the genome, slightly higher levels occur proximal to telomeres. We observe a dynamic interplay between histone sumoylation and either acetylation or ubiquitylation, where sumoylation serves as a potential block to these activating modifications. These results indicate that sumoylation is the first negative histone modification to be identified in S. cerevisiae and further suggest that sumoylation may serve as a general dynamic mark to oppose transcription.
authors.affiliation: Gene Expression and Regulation Program, The Wistar Institute, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Dafna
authors.initials: D
authors.lastname: Nathan
authors.forename: Kristin
authors.initials: K
authors.lastname: Ingvarsdottir
authors.forename: David E
authors.initials: DE
authors.lastname: Sterner
authors.forename: Gwendolyn R
authors.initials: GR
authors.lastname: Bylebyl
authors.forename: Milos
authors.initials: M
authors.lastname: Dokmanovic
authors.forename: Jean A
authors.initials: JA
authors.lastname: Dorsey
authors.forename: Kelly A
authors.initials: KA
authors.lastname: Whelan
authors.forename: Mihajlo
authors.initials: M
authors.lastname: Krsmanovic
authors.forename: William S
authors.initials: WS
authors.lastname: Lane
authors.forename: Pamela B
authors.initials: PB
authors.lastname: Meluh
authors.forename: Erica S
authors.initials: ES
authors.lastname: Johnson
authors.forename: Shelley L
authors.initials: SL
authors.lastname: Berger
mesh_terms: D000107:Acetylation; D000595:Amino Acid Sequence; D015153:Blotting, Western; D006657:Histones / Q000378:metabolism*; D047468:Immunoprecipitation; D011499:Protein Processing, Post-Translational; D025842:SUMO-1 Protein / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D016615:Telomere; D025801:Ubiquitin / Q000378:metabolism
chemical_list: D006657:Histones; D025842:SUMO-1 Protein; D025801:Ubiquitin