セロトニン受容体における分子認識の構造的基礎
Chong Wang1, Yi Jiang, Jinming Ma
1Department of Integrative Structural and Computational Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
まとめ
結晶構造は,セロトニン5HT1B受容体が,抗片頭痛薬にどのように結合するかを明らかにしています. これは薬剤の作用を明確にし,新しいセレクト性セロトニン薬の設計に役立ちます.
科学分野:
- 神経科学は神経科学である.
- 薬理学 薬理学とは
- 構造生物学 構造生物学とは
背景:
- セロトニン (5-ヒドロキシトリプタミン,5-HT) は,その受容体ファミリーを通じて多様な生理学的機能を調節する重要な神経伝達物質です.
- 5-HT受容体ファミリー,特に5-HT1Bサブタイプは,抗偏頭痛薬を含む治療的介入のターゲットです.
研究 の 目的:
- 人間の5-HT1B Gタンパク質結合受容体 (GPCR) に結合するリガンドの構造的基礎を解明する.
- 5-HT1B受容体とのエルゴタミンとダイヒドロエルゴタミンの分子相互作用を理解する.
- サブタイプ選択性セロトニン薬の合理的な設計のための洞察を提供すること.
主な方法:
- エルゴタミンとダイヒドロエルゴタミンに結合する5-HT1B受容体の構造を決定するためのX線結晶学.
- 分子ドッキングシミュレーション.
- サイト・ディレクテッド・ミュータジェネシス研究.
主要な成果:
- 結晶構造は,5-HT1B受容体のオーソステリックと拡張ポケット内のエルゴタミンとダイヒドロエルゴタミンの保存された結合モードを明らかにします.
- オーソステルポケットを形成する主要な残基は,5-HT受容体ファミリー全体に保存され,広範なアゴニスト活性を説明します.
- 5-HT2B受容体と比較して5-HT1B受容体のヘリックスVの明確な外向きのシフトは,より開かれた拡張ポケットを作り出し,亜型選択性に寄与します.
結論:
- 決定された構造は,エルゴタミンとダイヒドロエルゴタミンによる5-HT1B受容体活性化の詳細な分子理解を提供します.
- これらの発見は,5-HT1B受容体を標的とした新薬を開発するための構造的基盤を提供し,選択性と有効性を向上させます.
- この研究は,セロトニン薬の発見の分野を前進させるために,構造的洞察の重要性を強調しています.
関連する概念動画
G-protein Coupled Receptors
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.
Drugs Affecting GI Tract Motility: Serotonin Receptor Agonists
Serotonin, a crucial neurotransmitter synthesized by enterochromaffin cells, plays a cardinal role in regulating gastrointestinal (GI) motility. With over 90% of the body's total serotonin in the GI tract, its influence on digestive processes is profound. Serotonin is swiftly released upon various stimuli, such as food boluses or certain drugs, triggering intrinsic sensory neurons in the myenteric plexus and extrinsic vagal and spinal sensory neurons. This leads to the activation of the...
G Protein-coupled Receptors
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...
Adrenergic Agonists: Chemistry and Structure-Activity Relationship
Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
Olfactory Receptors: Location and Structure
The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
Assembly of Signaling Complexes
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,...


