SARS-CoV-2 NSP14 MTase活性对于诱导正规NF-κB激活至关重要
Marie J Tofaute1, Benjamin Weller2, Carina Graß1
1Research Unit Signaling and Translation, Group Signaling and Immunity, Molecular Targets and Therapeutics Center, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany.
Bioscience reports
|December 22, 2023
概括
SARS-CoV-2 NSP14蛋白激活NF-κB信号,这是COVID-19高炎症的一个关键驱动因素. 它的甲基转移酶活性由NSP10和SAM稳定,对这种免疫反应至关重要.
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:
- 严重的COVID-19涉及免疫失调和高炎症.
- 在SARS-CoV-2中,NSP14蛋白直接诱导NF-κB的激活.
- NF-κB (激活B细胞的核因子卡帕-轻链增强剂) 是免疫反应中的关键转录因子.
研究的目的:
- 阐明SARS-CoV-2 NSP14诱导的NF-κB激活的分子机制.
- 研究NSP14的甲基转移酶活性在NF-κB信号传递中的作用.
- 为了确定参与NSP14介导免疫反应的宿主因素.
主要方法:
- 利用了NSP14突变体和CRISPR/Cas9工程宿主因子淘汰 (KO) 细胞系.
- 通过记者测定和蛋白质-蛋白质相互作用研究 (共免疫沉) 评估NF-κB激活.
- 研究了NSP10结合和S-adenosylmethionine (SAM) 对NSP14稳定性和功能的影响.
主要成果:
- 全长NSP14需要甲基转移酶 (MTase) 活性来诱导NF-κB.
- NSP14的MTase缺陷突变显示出减少表达和蛋白质酶降解.
- 通过NSP10结合或SAM添加,NSP14稳定性和NF-κB激活潜力得到了增强.
- 由NSP14诱导的正规NF-κB激活取决于p65/RELA在NEMO/IKK的下游,而不是c-Rel或RelB.
- NSP14与NEMO或p65没有直接相互作用,表明通过MTase活动间接激活.
结论:
- SARS-CoV-2 NSP14通过其甲基转移酶活性增加了基底NF-κB激活.
- 这种机制可能有助于SARS-CoV-2感染细胞中增强细胞因子表达.
- 了解NSP14的作用可以了解COVID-19的病原和潜在的治疗点.
相关概念视频
NF-κB-dependent Signaling Pathway
7.4K
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The...
NF-κB-dependent Signaling Mechanism
The...
7.4K
Co-activators and Co-repressors
7.4K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
7.4K
MAPK Signaling Cascades
5.5K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
5.5K
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
cAMP-dependent Protein Kinase Pathways
6.4K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
6.4K
Master Transcription Regulators
6.9K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
6.9K


