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G-protein Coupled Receptors01:21

G-protein Coupled Receptors

131.0K
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
131.0K
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...
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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...
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Transducer Mechanism: G Protein–Coupled Receptors01:30

Transducer Mechanism: G Protein–Coupled Receptors

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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical,...
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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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G Protein-coupled Receptors01:15

G Protein-coupled Receptors

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
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関連する実験動画

Updated: Dec 18, 2025

Strategic Screening and Characterization of the Visual GPCR-mini-G Protein Signaling Complex for Successful Crystallization
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Strategic Screening and Characterization of the Visual GPCR-mini-G Protein Signaling Complex for Successful Crystallization

Published on: March 16, 2020

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脂質膜におけるドーパミン受容体-Gタンパク質複合体の構造

Jie Yin1, Kuang-Yui M Chen2, Mary J Clark3

  • 1Department of Biophysics, The University of Texas Southwestern Medical Center, Dallas, TX, USA.

Nature
|June 13, 2020
PubMed
まとめ
この要約は機械生成です。

研究者らは,活性化されたドーパミンD2受容体 (DRD2) を膜でGiタンパク質と複合させた. この構造的な洞察は,中枢神経系障害に対する新しい薬の設計に役立ちます.

さらに関連する動画

Construction of Model Lipid Membranes Incorporating G-protein Coupled Receptors GPCRs
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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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関連する実験動画

Last Updated: Dec 18, 2025

Strategic Screening and Characterization of the Visual GPCR-mini-G Protein Signaling Complex for Successful Crystallization
09:19

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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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科学分野:

  • 神経科学
  • 構造生物学
  • 薬理学について

背景:

  • D2ドーパミン受容体 (DRD2) は,パーキンソン病および精神疾患の治療における重要な標的である.
  • ドーパミンまたはアゴニストによるDRD2活性化は,アデニルサイクラスを阻害するGiタンパク質によるシグナリングカスケードを開始します.

研究 の 目的:

  • フォスフォリピド膜内のアゴニスト結合活性化DRD2-Gi複合体の高解像度構造を決定する.
  • ネイティブのような環境におけるGタンパク質結合受容体 (GPCR) -Gタンパク質相互作用の構造的ベンチマークを提供する.

主な方法:

  • 電子冷凍顕微鏡 (cryo-EM) を用いてDRD2- Gi複合体を視覚化しました.
  • 複合体は細胞状態を真似るためにフォスフォリピド二重層に再構成された.

主要な成果:

  • この研究は,ループとトランスメブラン領域 (TM5,TM6,TM7) の変化を含む,DRD2の細胞外リガンド結合部位におけるアゴニスト誘発型変化を明らかにした.
  • 活性化時に明確な細胞内Gi結合部位の開口が観察されました.
  • ヘリックス8埋葬とGiタンパク質の脂質アンカリングなどの膜埋め込み複合体に特有の相互作用が特定されました.

結論:

  • 決定された構造は,膜に埋め込まれたGPCR-Gタンパク質複合体の最初の実験モデルを表しています.
  • この構造モデルは,神経学的および精神学的状態のためのサブタイプ選択DRD2リガンドの開発を導くでしょう.