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The Capability of O-Acetyl-ADP-Ribose, an Epigenetic Metabolic Small Molecule, on Promoting the Further Spreading of Sir3 along the Telomeric Chromatin

1
Institute of Molecular Biology, Academia Sinica, Taipei 115, Taiwan
2
Department of Biomedical Sciences, Chung Shan Medical University, Taichung 402, Taiwan
3
Department of Medical Research, Chung Shan Medical University Hospital, Taichung 402, Taiwan
4
Institute of Molecular and Genomic Medicine, National Health Research Institutes, Miaoli 350, Taiwan
5
Department of Food Science and Biotechnology, Da-Yeh University, Changhua 515, Taiwan
6
Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan
7
Guang EM Laboratory, New Taipei 242, Taiwan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Genes 2019, 10(8), 577; https://doi.org/10.3390/genes10080577
Received: 12 July 2019 / Revised: 23 July 2019 / Accepted: 27 July 2019 / Published: 30 July 2019
O-acetyl-ADP-ribose (AAR) is a metabolic small molecule relevant in epigenetics that is generated by NAD-dependent histone deacetylases, such as Sir2. The formation of silent heterochromatin in yeast requires histone deacetylation by Sir2, structural rearrangement of SIR complexes, spreading of SIR complexes along the chromatin, and additional maturation processing. AAR affects the interactions of the SIR-nucleosome in vitro and enhances the chromatin epigenetic silencing effect in vivo. In this study, using isothermal titration calorimetry (ITC) and dot blotting methods, we showed the direct interaction of AAR with Sir3. Furthermore, through chromatin immunoprecipitation (ChIP)-on-chip and chromatin affinity purification (ChAP)-on chip assays, we discovered that AAR is capable of increasing the extended spreading of Sir3 along telomeres, but not Sir2. In addition, the findings of a quantitative real-time polymerase chain reaction (qRT-PCR) and examinations of an in vitro assembly system of SIR-nucleosome heterochromatin filament were consistent with these results. This study provides evidence indicating another important effect of AAR in vivo. AAR may play a specific modulating role in the formation of silent SIR-nucleosome heterochromatin in yeast. View Full-Text
Keywords: AAR (O-acetyl-ADP-ribose); epigenetic; silent heterochromatin; Sir2; Sir3; small molecule; telomere AAR (O-acetyl-ADP-ribose); epigenetic; silent heterochromatin; Sir2; Sir3; small molecule; telomere
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Tung, S.-Y.; Wang, S.-H.; Lee, S.-P.; Tsai, S.-P.; Su, K.-C.; Shen, H.-H.; Hong, J.-Y.; Tsai, M.-S.; Liou, G.-G. The Capability of O-Acetyl-ADP-Ribose, an Epigenetic Metabolic Small Molecule, on Promoting the Further Spreading of Sir3 along the Telomeric Chromatin. Genes 2019, 10, 577.

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Genes, EISSN 2073-4425, Published by MDPI AG
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