SUMOylation 在核基质中得到丰富,并且对于染色体分离是必需的
Zhaosu Chen1, Jing Luo1, Yunpeng Zhang2
1Shanghai Key Laboratory of Regulatory Biology, Fengxian District Central Hospital-ECNU Joint Center of Translational Medicine, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China.
The Journal of biological chemistry
|December 10, 2023
概括
关键蛋白质修饰的SUMOylation集中在核基质中,而不是染色质中. SUMOylation的损失导致细胞分裂错误,这表明核矩阵是核矩阵.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- SUMOylation是一种关键的翻译后修饰,可以调节各种生物过程.
- 通常在核中发现SUMOylated蛋白质,参与染色体调节.
- 最近的发现表明,SUMOylation机制定位在核基质中,与染色体不同.
研究的目的:
- 为了研究核中SUMOylated蛋白质的精确定位.
- 确定SUMOylation在核矩阵形成和蛋白质向中的作用.
- 阐明SUMOylation损失对细胞过程,特别是细胞分裂的功能后果.
主要方法:
- 生物化学试验分析蛋白质组成.
- 细胞成像技术用于可视化蛋白质定位.
- 蛋白质组分析以确定SUMOylated蛋白质.
- 基因淘汰 (KO) 研究,特别针对UBC9,即SUMO结合E2酶.
- 抑制SUMO激活E1酶的作用.
主要成果:
- 在核基质中,SUMOylated 蛋白质具有显著的丰富性.
- SUMOylation的无活化对核矩阵组成或蛋白质向矩阵的影响最小.
- SUMOylation (UBC9 KO) 的损失并没有导致显著的DNA损伤.
- UBC9 KO 细胞表现出线粒性停止和染色体错误分离.
结论:
- SUMOylated 蛋白质被选择性地定位到核基质中.
- 对于核矩阵组装或核矩阵内的蛋白质定位来说,SUMOylation不是必不可少的.
- 核矩阵可能在调解SUMOylation中发挥作用.
- 破坏SUMOylation导致细胞分裂的缺陷,突出显示其在线粒分裂中的重要性.
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