Sirtuin E is a fungal global transcriptional regulator that determines the transition from the primary growth to the stationary phase
| Autor: | Naoki Takaya, Rika Odakura, Ken-Ichi Oinuma, Motoyuki Shimizu, Shunsuke Masuo, Eriko Itoh |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
030106 microbiology Biology Biochemistry Microbiology Aspergillus nidulans Fungal Proteins 03 medical and health sciences Histone H3 chemistry.chemical_compound Gene Expression Regulation Fungal Transcriptional regulation Sirtuins Molecular Biology reproductive and urinary physiology Fungal protein Sire Cell Biology chemistry Sirtuin Acetyllysine biology.protein Histone deacetylase Transcriptome Chromatin immunoprecipitation Transcription Factors |
| Zdroj: | Journal of Biological Chemistry. 292(26):11043-11054 |
| ISSN: | 0021-9258 |
| Popis: | In response to limited nutrients, fungal cells exit the primary growth phase, enter the stationary phase, and cease proliferation. Although fundamental to microbial physiology in many environments, the regulation of this transition is poorly understood but likely involves many transcriptional regulators. These may include the sirtuins, which deacetylate acetyllysine residues of histones and epigenetically regulate global transcription. Therefore, we investigated the role of a nuclear sirtuin, sirtuin E (SirE), from the ascomycete fungus Aspergillus nidulans. An A. nidulans strain with a disrupted sirE gene (SirEΔ) accumulated more acetylated histone H3 during the stationary growth phase when sirE was expressed at increased levels in the wild type. SirEΔ exhibited decreased mycelial autolysis, conidiophore development, sterigmatocystin biosynthesis, and production of extracellular hydrolases. Moreover, the transcription of the genes involved in these processes was also decreased, indicating that SirE is a histone deacetylase that up-regulates these activities in the stationary growth phase. Transcriptome analyses indicated that SirE repressed primary carbon and nitrogen metabolism and cell-wall synthesis. Chromatin immunoprecipitation demonstrated that SirE deacetylates acetylated Lys-9 residues in histone H3 at the gene promoters of α-1,3-glucan synthase (agsB), glycolytic phosphofructokinase (pfkA), and glyceraldehyde 3-phosphate (gpdA), indicating that SirE represses the expression of these primary metabolic genes. In summary, these results indicate that SirE facilitates the metabolic transition from the primary growth phase to the stationary phase. Because the observed gene expression profiles in stationary phase matched those resulting from carbon starvation, SirE appears to control this metabolic transition via a mechanism associated with the starvation response. |
| Databáze: | OpenAIRE |
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