SARS-CoV-2 Nsp14结合Tollip并激活促炎途径,同时降低干扰素α和干扰素γ受体的调节
Naveen Thakur1, Poushali Chakraborty1, JoAnn M Tufariello1
1Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029.
bioRxiv : the preprint server for biology
|December 23, 2024
概括
SARS-CoV-2 Nsp14蛋白激活免疫信号通路并降低干扰素受体的调节. 它的N7-MTase域对这些功能和与宿主蛋白Tollip的相互作用至关重要,有助于病毒免疫逃避.
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:
- 在SARS-CoV-2中,非结构性蛋白14 (Nsp14) 具有外核酶 (ExoN) 和N7-甲基转移酶 (N7-MTase) 域.
- Nsp14调节宿主免疫反应,包括NF-κB激活和IFNAR1下调.
研究的目的:
- 为了研究NSP14对宿主免疫信号通路的更广泛影响.
- 阐明NSP14的域在免疫调节中的作用,并确定相互作用的宿主因素.
主要方法:
- 对NSP14突变的分析,以评估域功能.
- 研究NSP14对MAPK信号传递,细胞因子产生和干扰素受体表达的影响.
- 识别和描述Nsp14相互作用的主体蛋白质,包括Tollip.
主要成果:
- Nsp14激活NF-κB,ERK,p38和JNK MAPK信号,促进细胞因子的产生.
- 通过 lysosomal 途径,NSP14 降低了 IFNAR1 和 IFNGR1 的调节.
- N7-MTase域突变损害了NSP14的促炎和免疫受体下调功能.
- 主体蛋白Tollip与NSP14相互作用,并对抗NF-κB的激活.
- 托利普倒置部分逆转了受感染细胞中的IFNAR1和IFNGR1下调.
结论:
- Nsp14具有广泛的免疫调节功能,需要EXON和N7-MTase域.
- Nsp14-Tollip的相互作用对NSP14的先天免疫逃避策略至关重要.
- 准NSP14-Tollip相互作用可能为SARS-CoV-2提供治疗途径.
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