関連する実験動画
Updated: Nov 16, 2025

10:13
Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
Published on: June 9, 2017
16.7K
光誘発受容体の閉じ込めは,リガンド独立のGPCRシグナリングを駆動する
M Florencia Sánchez1, Sylvia Els-Heindl2, Annette G Beck-Sickinger2
1Institute of Biochemistry, Biocenter, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany.
まとめ
科学者たちは 細胞膜に G タンパク質結合受容体 (GPCR) を 精密に配置する 光制御システムを開発しました この方法はレセプタークラスタを急速に変化させ,リガンド独立のシグナル伝達と細胞応答を明らかにした.
科学分野:
- 細胞生物学
- バイオ物理学
- 分子信号
背景:
- 細胞間の通信は,プラズマ膜における受容体-リガンドの相互作用に依存する.
- 空間時間的な受容体の組織は 細胞の反応に重大な影響を及ぼします
- ゲトロトリメルグアニン核酸結合タンパク質 (Gタンパク質) 結合受容体 (GPCR) は重要なシグナル伝達分子である.
研究 の 目的:
- 細胞反応における受容体のクラスタリングの役割を調査する.
- 生体細胞におけるGPCR組織を制御するための光誘導方法を開発する.
- リガンド独立の受容体活性化について調べる
主な方法:
- 鍵と鍵の相互作用ペアを持つ光指示マトリックスの製造.
- 活体細胞における神経ペプチドY2受容体のクラスタリングの光媒介制御.
- 細胞形態,運動,カルシウム信号の分析
主要な成果:
- レセプタークラスタのサイズ,位置,密度を数秒で素早く調整する.
- 生殖時にリガンド独立のGPCR活性化を示す.
- 細胞形態,運動性,およびカルシウムシグナル伝達における観察された変化.
結論:
- 光制御されたGPCRの組織は,細胞シグナル伝達に対する正確な時空制御を提供します.
- このアプローチは,細胞機能に影響を与える,リガンド独立の受容体活性化を誘導することができる.
- この方法論は,細胞シグナル伝達とメカニカル伝達メカニズムを研究するための新しいツールを提供します.
関連する概念動画
GPCR Desensitization
7.2K
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...
7.2K
G Protein-coupled Receptors
15.0K
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...
15.0K
GPCRs Regulate Adenylyl Cylase Activity
6.4K
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
6.4K
Transducer Mechanism: G Protein–Coupled Receptors
3.2K
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,...
3.2K
G-protein Coupled Receptors
128.5K
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.
128.5K
Amplifying Signals via Enzymatic Cascade
15.2K
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...
15.2K

