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相关概念视频

Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

4.7K
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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Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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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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Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
8.9K
GPCR Desensitization01:12

GPCR Desensitization

6.1K
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
12.5K
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

5.0K
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
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相关实验视频

Updated: May 3, 2026

Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays
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一个Akt/beta-arrestin 2/PP2A信号复合体介导多巴胺基神经传递和行为.

Jean-Martin Beaulieu1, Tatyana D Sotnikova, Sébastien Marion

  • 1Department of Cell Biology, Center for Models of Human Disease, Institute for Genome Sciences and Policy, Duke University Medical Center, Durham, North Carolina 27710, USA.

Cell
|July 30, 2005
PubMed
概括

β-arrestin 2作为多巴胺受体信号的支架,影响Akt调节和与精神分裂症相关的多巴胺依赖行为. 这种蛋白质对多巴胺转移至关重要,也是潜在的药物标.

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Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
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Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
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科学领域:

  • 神经科学是一个神经科学.
  • 分子生物学分子生物学
  • 药理学 药理学是指药理学的学科.

背景情况:

  • 多巴胺信号传递与精神分裂症有关.
  • D2类多巴胺受体是抗精神病药物的关键点.

研究的目的:

  • 研究β-arrestin2在D2类多巴胺受体信号传递中的作用及其对多巴胺相关行为的影响.
  • 为了阐明底层的分子机制β-阿雷斯2-介导的Akt调节.

主要方法:

  • 利用缺乏β-arrestin2的小鼠研究多巴胺受体信号传递.
  • 分析了状体中多巴胺对Akt的调节.
  • 研究了涉及Akt,β-arrestin 2和蛋白质酸酶2A (PP2A) 的蛋白质-蛋白质相互作用.

主要成果:

  • 贝塔-阿雷斯二缺乏减少了多巴胺依赖的行为,并破坏了多巴胺对Akt的调节.
  • 在缺乏β-arrestin 2的小鼠中,Akt与其负调节器PP2A之间的相互作用受损.
  • 规范的cAMP介导的多巴胺受体信号传输没有受到影响.

结论:

  • β-arrestin 2作为信号中间体和激酶/酸酶支架,除了在受体脱敏化中的作用之外.
  • β-arrestin 2对于多巴胺相关的行为至关重要,这表明它作为多巴胺突触传输的积极调解者的作用.
  • β-arrestin 2代表了多巴胺相关精神疾病,如精神分裂症的潜在治疗标.