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相关概念视频

The Two-State Receptor Model01:29

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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
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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
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
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Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
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一个由信号输入控制的化学受体构造平衡.

Mikaila C Hoffman1, Mingshan Li2, Gerald L Hazelbauer2

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|July 9, 2025
PubMed
概括

细菌使用化学受体进行定向运动. 这项研究揭示了连接体结合和修饰改变受体几何,而不仅仅是切换状态,影响细菌化学反应信号.

关键词:
细菌的化学毒素作用.单分子FRETET是一种单分子FRET.跨膜受体是什么意思

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科学领域:

  • 微生物学 微生物学
  • 生物化学 生化学
  • 结构生物学 结构生物学

背景情况:

  • 细菌通过化学反应 (chemotaxis) 导航化学梯度,这是一个由跨膜化学受体介导的过程.
  • 化疗受体通过细胞膜发出信号,控制下游通路,并进行适应的修改.
  • 目前的模型提出,化疗受体在基于连接体结合和修饰的基础上,在两个不同的信号状态 (激酶关闭和激酶启动) 之间切换.

研究的目的:

  • 为了研究大肠杆菌 (Escherichia coli) 的阿斯巴酸化学受体Tar. Tar的结构平衡.
  • 确定连接体占用和适应性修饰如何影响这种平衡.
  • 澄清细菌化学反应中的跨膜信号的结构基础.

主要方法:

  • 单分子福斯特共振能量转移 (smFRET) 用于监测螺旋分离.
  • 测量重点是Tar受体的细胞质四螺旋绕的卷轴捆.
  • 在各种条件下分析了对联体占用和适应性修饰的合规变化.

主要成果:

  • 在所有条件下,在每个螺旋对中观察到两个明显的螺旋分离,相对占用率不同.
  • 连接物占用使捆从对称转移到形包装.
  • 适应性修改影响了哪个螺旋对在形包装中占据了中心位置.

结论:

  • 化学受体信号涉及结构平衡的动态变化,而不是简单的两种状态开关.
  • 连接物结合改变了四螺旋束的集体几何,影响了信号传输.
  • 这些发现为跨膜受体功能提供了新的见解,并可能适用于其他受体系统.