通过对其人类类型USP41进行比较分析,揭示了USP18脱化机制
Thomas Bonacci1, Derek L Bolhuis2, Nicholas G Brown1
1Department of Pharmacology and Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
bioRxiv : the preprint server for biology
|June 10, 2024
概括
类似于乌比奎丁的蛋白质ISG15 (干扰素刺激基因15) 被USP18调节,这是一个具有未知的特异性机制的蛋白酶. 这项研究揭示了USP18的价值.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 生物化学 生物化学
背景情况:
- 类似于泛素的蛋白质ISG15 (干扰素刺激基因15) 对于通过ISGylation对宿主防御病毒和细菌感染至关重要.
- 囊蛋白酶USP18是逆转ISGylation (脱ISGylation) 的主要酶,但其对ISG15的高特异性尚不清楚.
研究的目的:
- 阐明USP18对ISG15.5的特定识别和解背后的分子机制.
- 调查USP18及其对应物USP41.1.之间的功能关系.
- 探索USP41在FAT10 (HLA-F相邻转录10),一种类似于乌比奎丁的蛋白质的结合中的作用.
主要方法:
- 18美元和41美元的比较分析.
- 确定关键的氨基酸残留物和参与USP18活动的蛋白质域.
- AlphaFold结构预测用于分析功能表面.
主要成果:
- 尽管USP41缺乏deISGylase活性,但USP18与USP41相互作用.
- USP18的特定区域,包括其C端和位置198的保存Leucine,对于ISG15的特异性和酶功能至关重要.
- USP41以一种独立于其催化活性的方式负面调节FAT10结合.
结论:
- 该研究确定了控制USP18对ISG15的特异性的关键分子决定因素.
- USP41作为FAT10结合的非催化对手,突出其独特的作用.
- 这些发现为ISG15和FAT10结合路径的调节提供了新的见解.
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