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希斯H2B的GlcNAcylation促进了它的单双化
Ryoji Fujiki1, Waka Hashiba, Hiroki Sekine
1Institute of Molecular and Cellular Biosciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
Nature
|November 29, 2011
概括
由O-GlcNAc转移酶 (OGT) 在S112中对基因素H2B的O-链接N-乙糖胺 (GlcNAc) 修饰促进了H2B的无处不在. 这种GlcNAcylation将葡萄糖水平与染色质调节和基因转录联系起来.
科学领域:
- 表观遗传学和染色体生物学
- 后翻译修改 后翻译修改
- 基因法规 基因法规
背景情况:
- 染色质的重组依赖于动态的组织蛋白修饰.
- 在染色质重塑过程中,O-链接的N-乙糖胺 (GlcNAc) 的作用在很大程度上是未知的.
- O-GlcNAc转移酶 (OGT) 和O-GlcNAcase (OGA) 催化了可逆的GlcNAcylation. 这种转移酶的作用是可逆的.
研究的目的:
- 在染色体重组中研究基因素GlcNAcylation在染色体重组中的重要性.
- 为了识别特定的由 GlcNAc.c. 修改的基因素残留物.
- 为了阐明基因素 GlcNAcylation 的功能后果.
主要方法:
- 在体外和体外使用OGT的GlcNAcylation测定.
- 通过赫克索胺生物合成途径 (HBP) 对细胞外葡萄糖的反应中,对基因素 GlcNAcylation 的分析.
- 在聚烯染色体上对H2B S112 GlcNAcylation和H2B K120 monoubiquitination定位的全基因组分析.
主要成果:
- 基 H2B 在 S112 位由 OGT 进行 GlcNAcylated.
- H2B S112 GlcNAcylation水平通过HBP与细胞外葡萄糖发生波动.
- H2B S112 GlcNAcylation促进了H2B K120的单化,可能作为化酶的对接点.
- H2B S112 GlcNAc局部化在 euchromatic 区域和转录基因位点,通常与H2BK120 monoubiquitination共同局部化.
结论:
- 基因组H2B S112 GlcNAcylation是一种由葡萄糖可用性调节的新型基因组修饰.
- 这种修改促进了H2B K120的单双化,将代谢状态与染色质调节联系起来.
- H2B S112 GlcNAcylation 很可能通过促进 H2BK120 单双化在转录激活中发挥作用.
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