基因素H2B和PCNA泛化动态的结构功能分析,使用二基酶缺乏菌株
Kaitlin S Radmall1, Prakash K Shukla1, Andrew M Leng1
1Department of Radiation Oncology and Huntsman Cancer Institute, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA.
Scientific reports
|October 4, 2023
概括
在酵母中删除duebiquitinase基因揭示了如何发生ubiquitin结合. 这种方法有助于研究生物体内蛋白质的泛化和脱化,如组蛋白H2B和PCNA.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生化学
- 分子生物学分子生物学
背景情况:
- 乌比基因化是一种关键的翻译后修饰,它调节细胞过程.
- 蛋白质的无化被无化结合酶和双化酶 (DUB) 所平衡.
- 了解无处不在的动态需要研究结合和去除路径.
研究的目的:
- 开发一种方法,通过操纵duebiquitinase活性来研究乌比基因合的要求.
- 为了研究蛋白质域和残留物在基因素H2B和PCNA的泛基化中的特定作用.
- 在体内阐明ubiquitin结合和deubiquitin结合之间的相互作用.
主要方法:
- 在酵母中删除二维基因酶 (UBP8,UBP10) 的基因.
- 在DUB缺陷突变体中对基与基蛋白 (海斯H2B,PCNA) 结合的分析.
- 位点定向突变发生,以评估特定蛋白质域 (Rad6,H2B) 的贡献.
主要成果:
- 由于没有特定的DUBs,因此可以更容易地研究乌比奎的结合动态.
- Lge1的C终端卷曲域和Rad6 E2的酸性尾部对于素H2BK123单双化至关重要.
- 在Rad6中,而不是它的尾部,需要特定的酸性残留物来进行PCNA单双化.
- 影响H2B C终端螺旋的突变通过改变结合率和双结合率来影响泛化.
结论:
- 酵母的DUB删除提供了一个多功能工具来剖析无处不在的途径.
- 特定的蛋白质域决定了无处不在的基质特异性.
- 结合和二维化之间的平衡对于调节蛋白质泛化状态至关重要.
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