SARS-CoV-2蛋白Nsp9通过与先天性免疫通路的相互作用,参与病毒逃避
Eryn Lundrigan1, Caroline Toudic1, Emily Pennock1
1Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada.
ACS omega
|June 24, 2024
概括
在SARS-CoV-2中,非结构性蛋白质Orf3a,Orf6和NSP9可以抑制宿主.
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 抑制宿主天生的抗病毒免疫反应有助于疾病的严重程度.
- 研究主要集中在病毒结构蛋白,对非结构蛋白和辅助蛋白在免疫逃避中的作用知之甚少.
- 了解这些机制对于开发有效的抗病毒策略至关重要.
研究的目的:
- 研究SARS-CoV-2非结构蛋白Orf3a,Orf6和NSP9在调节宿主抗病毒免疫反应中的作用.
- 阐明这些蛋白质抑制天生的免疫力并促进病毒逃避的特定分子机制.
主要方法:
- 利用聚I:C,一种病毒dRNA的合成模拟物,模仿病毒感染状态并引起抗病毒反应.
- 采用全基因组表达特征分析,分析Orf3a,Orf6和NSP9对宿主的免疫信号转录组的影响.
- 专注于关键的抗病毒途径,包括RIG-I,NF-kB和TBK1.
主要成果:
- 发现Orf3a,Orf6和NSP9在不同程度上调节宿主抗病毒信号转录组.
- 这些蛋白质独特地抑制了先天免疫信号的特定方面.
- 确定SARS-CoV-2 Nsp9通过抑制RIG-I表达来阻碍病毒检测,并通过降低NF-kB和TBK1.1的调节来对抗干扰素级联,从而阻碍病毒检测.
结论:
- SARS-CoV-2非结构性蛋白质采用独特的分子机制来抑制免疫信号,并促进病毒逃避.
- 通过向先天免疫的关键组成部分,NSP9显著损害宿主抗病毒免疫反应.
- 这些发现突出了针对SARS-CoV-2的治疗干预的新目标.
相关概念视频
Immune Response Against Viral Pathogens
775
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
775
Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
siRNA - Small Interfering RNAs
16.7K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
16.7K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
Conjugated Proteins
18.3K
Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
18.3K
Single Nucleotide Polymorphisms-SNPs
15.0K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
15.0K


