関連する実験動画
Updated: Feb 9, 2026
15:35
Analyzing Large Protein Complexes by Structural Mass Spectrometry
Published on: June 19, 2010
24.8K
μ-オピオイド受容体-Giタンパク質複合体の構造
Antoine Koehl1, Hongli Hu1,2, Shoji Maeda2
1Department of Structural Biology, Stanford University School of Medicine, Stanford, CA, USA.
Nature
|June 15, 2018
まとめ
Gタンパク質に結合するムオピオイド受容体 (μOR) の構造を決定した. これはオピオイド結合とGタンパク質の特異性に関する重要な相互作用を明らかにした.
科学分野:
- 構造生物学
- 神経科学
- 薬理学について
背景:
- ミュオピオイド受容体 (μOR) は,オピオイドが標的とするGタンパク質結合受容体 (GPCR) である.
- 鎮痛と快楽のようなオピオイド効果は,抑制性Gタンパク質Giを通じてμORシグナル伝達によって媒介されます.
研究 の 目的:
- アゴニストDAMGOとヌクレオチドフリーGiに結合したμORの高解像度冷凍電子顕微鏡構造を決定する.
- μOR-Giのタンパク質結合特異性を支配する構造的特徴を解明する.
主な方法:
- 3.5 Åの解像度の冷凍電子顕微鏡 (冷凍EM)
- μOR,アゴニストDAMGO,およびヌクレオチドフリーGiタンパク質の複合形成.
主要な成果:
- 構造はモルヒナンのポケットにDAMGO結合を明らかにし,相互作用が選択性に影響する.
- Gsに結合したGPCRと比較すると,トランスメブランヘリックス6の位置とGタンパク質αサブユニット相互作用の違いが示される.
- μOR-Giの複雑なインターフェイスに関する詳細な洞察.
結論:
- μOR-Gi構造は,オピオイドの作用を理解するための分子基盤を提供します.
- 構造的差異は,μORに対するGタンパク質結合特異性のメカニズムを強調する.
- 新規のμOR標的治療法の設計に役立つ.
関連する概念動画
01:22Opioid Receptors: Overview
4.4K
Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
4.4K
02:15Protein and Protein Structure
88.2K
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
A protein's shape is critical to its function. For example, an enzyme...
88.2K
02:41Protein Complex Assembly
16.8K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
16.8K
01:57Protein Complexes with Interchangeable Parts
2.9K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
2.9K
01:21G-protein Coupled Receptors
132.1K
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.
132.1K
01:15Opioid Analgesics: Synthetic and Semisynthetic Opioids
1.1K
Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
1.1K