粘着GPCR信号伝導の分子特性
bioRxiv : the preprint server for biology
|September 2, 2025
まとめ
粘着Gタンパク質結合受容体 (aGPCR) は,GAINドメインを脱落させるか,または完結した結合を介して,異なる機械的な力経路を使用して信号を送る. この研究は,力方向がこれらのaGPCR活性化メカニズムをどのように制御するかを明らかにしています.
科学分野:
- 細胞生物学
- 分子生物学と構造生物学
- バイオ物理学
背景:
- 細胞プロセスは,粘着Gタンパク質結合受容体 (aGPCRs) のような膜受容体による機械信号伝導に依存する.
- aGPCRsの異なる活性化モードは,流出依存および流出依存の経路を含むが,分子レベルでは十分に理解されていません.
研究 の 目的:
- ADGRG1の構造的および動的メカニズムを解明する.
- 機械的な力がGPCRの活性化経路をどのように制御するかを理解する.
主な方法:
- 単分子力スペクトロスコーピーの統合,分子力学シミュレーション,および細胞ベースの測定.
- ディープラーニングによるGAINドメインの設計
主要な成果:
- 切断ストレスは GAIN ドメインの異なる変形経路を誘導し,脱落前に縛られたアゴニストを暴露します.
- 全長 ADGRG1シグナリングは,GAINの方向性および7TMコア相互作用に依存するGAINの流出なしに,アロステル結合アゴニストの関与によって発生する.
- 適用された力の方向性によって活性化経路が決定されます. GAINの脱落または無傷のGAIN-7TMカップリング.
- エンジニアリングされたGAINの変種は,予測可能なシグナル感度の変化を示します.
結論:
- GAINドメインのダイナミクスと指向によって支配されるGPCRの活性化のための統一された枠組みが確立されています.
- メカニズムは機械的およびアロステリック受容体の機能モデルを橋渡しする.
- この発見は,機械感受性受容体を設計し,精密な治療法を開発するための戦略を提供します.
関連する概念動画
Transducer Mechanism: G Protein–Coupled Receptors
2.4K
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,...
GPCRs are also called heptahelical,...
2.4K
G-protein Coupled Receptors
121.2K
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.
121.2K
Assembly of Signaling Complexes
5.9K
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,...
5.9K
G Protein-coupled Receptors
13.3K
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...
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...
13.3K
Intracellular Signaling Affects Focal Adhesions
2.8K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.8K
Amplifying Signals via Enzymatic Cascade
8.7K
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...
8.7K


