SFTSV的非结构蛋白通过破坏DPP9-介导的三元复合体来激活NLRP1和CARD8炎症体
Pan-Pan Liu1, Shu-Peng Jiang2, Bang Li1
1State Key Laboratory of Virology, School of Public Health, Wuhan University, Wuhan, China.
PLoS pathogens
|July 3, 2025
概括
传播的布尼亚病毒SFTSV通过破坏DPP9抑制复合体来激活NLRP1和CARD8炎症体. 病毒NSs蛋白向FIIND域,降解DPP8/9,并释放炎性酶招募域 (CARD) 进行免疫信号传递.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 分子生物学分子生物学
背景情况:
- 炎症体是通过病原体检测激活的免疫信号平台.
- NLRP1和CARD8炎症酶利用C端碎片 (CT) 与CARD和UPA域进行启动.
- 双基酶8和9 (DPP8/9) 通常通过与其FIIND域形成三元复合物来抑制NLRP1/CARD8.
研究的目的:
- 为了确定NLRP1和CARD8炎症酶激活的特定触发因素.
- 阐明SFTSV感染激活NLRP1和CARD8炎症酶的机制.
- 调查CARD8在SFTSV复制中的作用.
主要方法:
- 主要角质细胞和巨细胞感染SFTSV.
- 对NLRP1和CARD8炎症酶激活的分析.
- 研究SFTSV NSs蛋白,NLRP1/CARD8和DPP8/9.9之间的相互作用.
- 在CARD8删除的细胞中评估SFTSV复制.
主要成果:
- SFTSV感染激活了角质细胞中的NLRP1炎症体和巨细胞中的CARD8炎症体.
- SFTSV NSs蛋白与NLRP1/CARD8的FIIND域相互作用,促进DPP8/9的降解.
- 这种干扰会破坏抑制三元复合体的稳定,释放激活的CT并启动炎症体信号传递.
- 删除CARD8可以增强SFTSV的复制.
结论:
- SFTSV通过一种新的机制激活NLRP1和CARD8炎症体,涉及破坏DPP9结合检查点.
- SFTSV NSs 蛋白质是这种激活过程中的关键病毒因素.
- CARD8在控制SFTSV复制方面发挥着重要作用.
相关概念视频
The Extrinsic Apoptotic Pathway
6.6K
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
6.6K
The Intrinsic Apoptotic Pathway
6.9K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
6.9K
The Unfolded Protein Response
5.1K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
5.1K
Regulation of the Unfolded Protein Response
2.6K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.6K
Caspases
12.7K
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
12.7K
NF-κB-dependent Signaling Pathway
7.9K
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...
7.9K


