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相关概念视频

Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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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,...
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The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

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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...
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
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Protein Folding01:25

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Molecular Models02:00

Molecular Models

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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相关实验视频

Updated: Jul 16, 2025

A Guide to Production, Crystallization, and Structure Determination of Human IKK1/α
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细胞因子-受体-JAK2信号复合体的结构建模使用AlphaFold多元体.

Irina D Pogozheva1, Stanislav Cherepanov2, Sang-Jun Park3

  • 1Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, Michigan 48109, United States.

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概括
此摘要是机器生成的。

这项研究模拟了完整的跨膜细胞因子受体复合体,揭示了连接体结合如何触发受体二分化和Janus Kinase 2 (JAK2) 激活细胞信号传导和瘤发生.

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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 细胞信号传递 细胞信号传递

背景情况:

  • 类1细胞因子受体 (例如,EPOR,TPOR,CSF3R,GHR,PRLR) 是单通的跨膜糖蛋白,调节关键的细胞过程.
  • 当这些受体被激活时,它们会与配体和Janus Kinase 2 (JAK2) 形成信号复合体,但它们的完整结构和动态尚不清楚.
  • 了解这些复合体对于破译细胞生长,分化和瘤发生至关重要.

研究的目的:

  • 为了生成五个人类同位体类型1细胞因子受体复合体的三维模型与配体和JAK2.2.
  • 阐明受体激活和JAK-STAT信号通路的结构基础.
  • 研究这些受体中的瘤基因突变的分子机制.

主要方法:

  • 使用AlphaFold Multimer进行大受体-细胞因子-JAK2复合体 (32204074残留物) 的逐步建模.
  • 通过与现有实验数据进行比较来验证模型.
  • 在显式等离子体膜脂质中进行复合物的分子动力学模拟.

主要成果:

  • 开发了5个人类同位体类型1细胞因子受体复合物的活性和非活性状态的模型.
  • 提出了一种涉及连接体诱导的受体二元化和TMα螺旋旋转的一般激活机制,导致JAK2激活.
  • 模拟了eltrombopag与血栓形成素受体 (TPOR) 的结合,并提供了对瘤原性突变的见解.

结论:

  • 生成的模型为理解1类细胞因子受体激活和JAK-STAT信号提供了一个结构框架.
  • 这些模型为由这些受体驱动的瘤发生提供了分子洞察力.
  • 计算模型是公开可用的,以便进一步研究.