结构表明,E3结合酶XIAP的BIR2域通过RIPK2激酶二聚体接口结合
Mathilde Lethier1, Karine Huard1, Michael Hons1
1European Molecular Biology Laboratory, Grenoble, France.
Life science alliance
|September 6, 2023
概括
受体相互作用蛋白激酶2 (RIPK2) 对于NOD信号传输至关重要. 结构研究揭示了XIAP BIR2结合如何抑制RIPK2,澄清了其在炎症性疾病无处不在的支架作用.
科学领域:
- 分子生物学分子生物学
- 结构生物学是结构生物学.
- 免疫学 免疫学 免疫学
背景情况:
- 受体相互作用蛋白激酶2 (RIPK2) 对于涉及炎症疾病的NOD信号通路至关重要.
- 它的激酶活性对于信号传递是不必要的,它与XIAP (X关联抑制剂的亡蛋白) 的相互作用是关键的.
- 针对RIPK2活动或XIAP BIR2域的抑制剂会破坏这种相互作用.
研究的目的:
- 阐明RIPK2和XIAP BIR2之间的相互作用背后的分子机制2.
- 确定XIAP BIR2抗剂抑制RIPK2信号的结构基础.
- 了解RIPK2的结构特征,这对于其在无处不在中的支架功能至关重要.
主要方法:
- 原生质谱学原生质谱学.
- 核磁共振 (NMR) 光谱学是指核磁共振的光谱学.
- 低温电子显微镜 (cryo-EM) 是一种电子显微镜.
- 在纤维化分析中用于验证.
主要成果:
- 确定了 RIPK2 激酶-BIR2 域复合物的结构,揭示了在 RIPK2 激酶反平行二次体上 BIR2 的结合.
- 这种结合解释了RIPK2活性抑制剂和XIAP BIR2抗剂的功能.
- 该结构澄清了为什么RIPK2酸化对于信号传递是不可或缺的,并确定RIPK2-K209对于XIAP BIR2相互作用至关重要.
结论:
- RIPK2-XIAP BIR2复杂结构为RIPK2监管提供了机制性的洞察力.
- 了解这种相互作用对于开发用于NOD相关炎症疾病的治疗方法至关重要.
- RIPK2的无处不在的支架功能依赖于结构揭示的特定形状特征.
更多相关视频
12:43Monitoring Activation of the Antiviral Pattern Recognition Receptors RIG-I And PKR By Limited Protease Digestion and Native PAGE
Published on: July 29, 2014
12.2K
09:26Identification of Footprints of RNA:Protein Complexes via RNA Immunoprecipitation in Tandem Followed by Sequencing RIPiT-Seq
Published on: July 10, 2019
10.6K
相关概念视频
Regulation of the Unfolded Protein Response
2.5K
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...
2.5K
The JAK-STAT Signaling Pathway
9.0K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
9.0K
MAPK Signaling Cascades
5.6K
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...
5.6K
Assembly of Signaling Complexes
5.8K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.8K
Receptor Tyrosine Kinases
13.1K
Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
13.1K
Phosphoinositides and PIPs
8.6K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
8.6K
