GPCRエクソフレーム調節器のデノボデザイン
Shizhuo Cheng1,2,3, Jia Guo1, Yun-Li Zhou1
1Department of Pathology of Sir Run Run Shaw Hospital, Department of Pharmacology, MOE Frontier Science Center for Brain Research and Brain-Machine Integration, and Liangzhu Laboratory, Zhejiang University School of Medicine, Hangzhou, China.
Nature
|February 16, 2026
まとめ
研究者らは,トランスメブラン領域を標的とする新しいGPCRエクソフレーム調節器 (GEMs) を開発した. これらのエンジニアリングされたタンパク質は,多様なアロステル調節剤として作用し,GPCRに関連する疾患に対する新しい治療戦略を提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- ドラッグ・ディスカバリー・ディスカバリー・ドラッグ・ディスカバリー・ドラッグ・ディスカバリー
背景:
- Gタンパク質結合受容体 (GPCR) は,伝統的にオーステリック部位で調節される主要な治療標的である.
- GPCRsのアロステリック調節は,薬物の発見のための革新的な戦略を提示します.
- 超膜タンパク質による天然のGPCR調節は,新しい調節器の設計にインスピレーションを与えました.
研究 の 目的:
- 新しく設計されたタンパク質,GPCRエクソフレーム調節器 (GEM) を開発し,GPCRのトランスメブラン領域を標的にする.
- ドーパミンD1受容体をモデルとして用いて,GEMのアロステリック調節能力を調査する.
- GPCRに関連する疾患に対するGEMの治療の可能性を調査する.
主な方法:
- 戦略的な構造的なプロンプトを持つ幻覚のようなアプローチを使用して,デノボのタンパク質設計.
- ドーパミンD1受容体を標的とする4つのGEMの選択と体系的な調査.
- GEM結合モードとアロステル調節効果を決定するための構造研究と機能分析.
主要な成果:
- GEMは,GPCRsのトランスメブランドメインと結合するように設計されました.
- 調査されたGEMは,アゴニスト陽性アロステルモジュレーター,ネガティブアロステルモジュレーター,バイアスアロステルモジュレーターなど,多様なアロステルモジュレーション活動を示した.
- 1つのGEM (ago-PAM) は,D1受容体機能喪失変異体の活性を再生することに成功しました.
結論:
- GEMは,GPCRトランスメブランドメインを標的とした新種のアロステリック調節剤を代表しています.
- GEMは,GPCRに関連する疾患の治療薬として有望を示しています.
- ディープラーニングベースのタンパク質設計は,機能指向の膜タンパク質の作成に有効です.
関連する概念動画
01:12GPCR Desensitization
8.3K
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...
8.3K
01:09GPCRs Regulate Adenylyl Cylase Activity
7.7K
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...
7.7K
01:30Transducer Mechanism: G Protein–Coupled Receptors
4.5K
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,...
4.5K
01:15G Protein-coupled Receptors
17.9K
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...
17.9K
01:21G-protein Coupled Receptors
132.2K
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.
132.2K
01:22Activation and Inactivation of G Proteins
11.8K
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...
11.8K