一个基于库林5的复合体作为ORF9b稳定性在SARS-CoV-2复制中的必要调节器
Yuzheng Zhou1,2, Zongpeng Chen1, Sijie Liu1
1Department of Cell Biology, School of Life Sciences, Central South University, 410013, Changsha, China.
Signal transduction and targeted therapy
|June 27, 2024
概括
SARS-CoV-2 ORF9b 蛋白质通过无处化降解,由 CUL5-TOM70-HSP90α 复合体调节. 抑制HSP90α加速ORF9b的降解,减少病毒复制,并提供新的COVID-19治疗策略.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- SARS-CoV-2 ORF9b 蛋白质通过抑制天生的免疫力,是病毒免疫逃避的关键.
- 调节ORF9b功能的机制,特别是在新兴变种中,需要进一步阐明.
研究的目的:
- 为了研究SARS-CoV-2 ORF9b.的无处不在和降解途径.
- 确定参与ORF9b调节的宿主因素,并探索治疗点.
主要方法:
- 在SARS-CoV-2 ORF9b上进行了乌比基化试验和蛋白质酶降解研究.
- 同免疫沉确定了ORF9b,TOM70,HSP90α和CUL5.5之间的相互作用.
- 单细胞测序分析了COVID-19患者肺细胞中的HSP90α表达.
- 评估了HSP90抑制剂的抗病毒功效.
主要成果:
- SARS-CoV-2 ORF9b 在 K67 处经历了无处不在和蛋白质体降解,在诸如 Delta 和 Omicron 等变种中得到保护.
- CUL5-TOM70-HSP90α复合体调节ORF9b的稳定性,其中CUL5调节了全方位化,HSP90α提供了稳定性.
- HSP90抑制剂 (GA,17-AAG) 增强了ORF9b的降解,并抑制了SARS-CoV-2的复制.
- 在COVID-19患者的肺上皮细胞中,HSP90α被上调.
结论:
- CUL5-TOM70-HSP90α复合体对SARS-CoV-2 ORF9b蛋白质的稳定性进行了关键控制.
- SARS-CoV-2 可能利用宿主 HSP90α 逃避免疫反应.
- 用HSP90抑制剂向这个复合体,为COVID-19提供了一个有希望的治疗策略.
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