在USP16和USP36中,ubiquitin/Fubi交叉活性的分子基础是USP16
Rachel O'Dea1,2, Nafizul Kazi1,2, Alicia Hoffmann-Benito1,2
1Chemical Genomics Centre, Max Planck Institute of Molecular Physiology, Dortmund, Germany.
Nature chemical biology
|July 14, 2023
概括
研究人员发现,USP16与USP36一起具有双重ubiquitin/Fubi裂变活性,有助于Fubi-S30的成熟. 结构研究揭示了这些二维基因酶的基质识别机制.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 乌比基和类似乌比基的蛋白质 (UBLs) 用不同的酶机制来执行不同的细胞功能.
- 免疫抑制性UBL,Fubi,以融合蛋白 (Fubi-S30) 的形式合成,并且需要核子二维基因酶USP36才能成熟成具有翻译能力的核糖体.
- 通过USP36识别Fubi的精确机制以及其他Fubi处理蛋白酶的存在仍然在很大程度上是未知的.
研究的目的:
- 为了识别参与富比成熟的新型蛋白酶.
- 阐明对Fubi和ubiquitin起作用的杜比基因酶的基质识别机制.
- 调查在Fubi-S30处理中识别的蛋白酶的功能作用.
主要方法:
- 开发和应用化学工具包用于化学蛋白质组学.
- 用Fubi和ubiquitin复合USP36的晶体结构的确定.
- 富比C-终端酶活性测定.
主要成果:
- 化学蛋白质组学确定了USP16作为一种新型蛋白酶,除了USP36.36之外,还具有双重ubiquitin和Fubi裂变活性.
- 晶体结构揭示了USP36对Fubi和ubiquitin的基质识别机制,解释了特异性.
- USP16在Fubi-S30的成熟过程中发挥了协同作用.
结论:
- 包括USP16和USP36在内的人类二维基基因酶的一个子集对乌比基和Fubi都表现出特异性.
- 对USP36-Fubi和USP36-ubiquitin复合物的结构洞察力澄清了基质结合和选择性.
- 这些发现为对Fubi系统及其相关蛋白酶的系统性研究提供了基础.
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