関連する実験動画
Updated: Aug 18, 2026

04:31
Taste Preference Assay for Adult Drosophila
Published on: September 8, 2016
グストドゥチンは,味覚細胞特異のGタンパク質で,トランスドゥチンと密接に関連しています
S K McLaughlin1, P J McKinnon, R F Margolskee
1Roche Institute of Molecular Biology, Roche Research Center, Nutley, New Jersey 07110-1199.
Nature
|June 18, 1992
まとめ
研究者らは,味覚組織に新しいGタンパク質アルファサブユニット,アルファ-ガストドゥチンを発見した. このタンパク質は特に味覚に含まれていて,味覚信号処理における重要な役割を果たしていることを示唆しています.
科学分野:
- 分子生物学は分子生物学である.
- 神経科学は神経科学である.
- 感覚生物学 感覚生物学について
背景:
- Gタンパク質結合受容体は,様々な感覚システムにおける信号伝達に不可欠である.
- Gタンパク質アルファサブユニットの一種であるトランスデューシンは,光受容体細胞における信号伝達を媒介する.
- 味覚の基礎となる分子機構は,完全に解明されていません.
研究 の 目的:
- 味の伝達に関与する新しいGタンパク質アルファサブユニットを特定し,特徴づけること.
- 味覚に関連する組織における新たに特定されたアルファ-グストドゥチンの発現パターンを決定する.
主な方法:
- 味の組織から新しいGタンパク質アルファサブユニット (アルファ-グストドゥチン) をクローン化.
- マッセンジャーRNA (mRNA) 発現分析は,in situ ハイブリダイゼーションやRT-PCRなどの技術を用いて行われます.
- 既知のGタンパク質アルファサブユニットとのアルファ-グストドゥチンの比較シーケンス分析.
主要な成果:
- アルファ-グストドゥチンという名前の新しいGタンパク質アルファサブユニットが成功裏に特定され,クローン化されました.
- alpha-Gustducin mRNAは,すべての味角 (環状,葉状,真菌状) の味蕾にのみ検出されました.
- アルファ-グストドゥチンの発現は,非感覚的な舌組織および他の検査された臓器に存在しなかった.
- 配列ホモロジーは,アルファ-グストドゥチンがトランスドゥチンと最も似ていることを明らかにしました.
結論:
- アルファ-グストドゥチンは,味に特異的なGタンパク質アルファサブユニットです.
- その発現パターンとトランスデューシンとの構造的類似性は,味覚信号伝達における役割を示唆しています.
- 発見は,味覚におけるグストドゥチンの機能と,光伝導におけるトランスドゥチンの機能の間の類似性を提案しています.
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.
Gustation
Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
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...
Activation and Inactivation of G Proteins
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 affinity and are together...
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...
Transducer Mechanism: G Protein–Coupled Receptors
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, 7TM, or...
GPCRs are also called heptahelical, 7TM, or...

