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合成トランスメブランのNa+トランスポーターとして機能する単分子G四重複体
Mark S Kaucher1, William A Harrell, Jeffery T Davis
1Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
Journal of the American Chemical Society
|January 5, 2006
まとめ
研究者らは,水素結合組を共振的に改変することによって,強力なトランスメブランナトリウム (Na+) イオントランスポーターを作成した. この新しいG-クアドルプレックス構造は,Na+イオンを細胞膜に効果的に輸送します.
科学分野:
- 超分子化学とは
- 生物物理化学 生物物理化学とは
- メンブラン輸送は,膜輸送です.
背景:
- 水素結合アセンブリは,分子認識と自己アセンブリの可能性を秘めています.
- 特定のイオンのための人工トランスポーターの設計は,生物学的プロセスを理解し,新しいテクノロジーを開発するために不可欠です.
研究 の 目的:
- 新しく強力な膜経由のナトリウム (Na+) イオントランスポーターを開発する.
- 機能的なアプリケーションのための水素結合アセンブリの共振的ポスト修正を調査する.
主な方法:
- オレフィン・メタテシスを用いて,グアノシン16つのサブユニットを,脂性G四重複構造にクロスリンクする.
- フォスホリピド膜環境におけるG四重複体の折り畳みと機能を調査する.
- 光と23Na核磁気共振 (NMR) を用いて,Na+イオン輸送活動を評価する.
主要な成果:
- グアノシンサブユニットの共振クロスリンクを通じて,単分子G四重複体を成功裏に合成しました.
- 改変されたG-クアドルプレックスがフォスフォリピド膜内で折りたたむことを実証した.
- 光と23Na NMRアッセイを介してG-クアドルプレックスの強力なトランスメブランNa+イオン輸送能力を確認しました.
結論:
- 水素結合アセンブリの共性ポスト修正により,機能的なバイオミメティックシステムが生成されます.
- 開発されたG-quadruplexは,膜を横断する効果的な人工Na+イオントランスポーターとして機能します.
- この研究は,生物医学的な応用の可能性のある洗練された分子トランスポーターを作成するための新しい戦略を提供します.
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.
Golgi Matrix Proteins
Golgi matrix proteins are a group of highly dynamic proteins that maintain the stacked structure of Golgi. These proteins adapt to rapid morphological changes of the Golgi during the cell cycle. During cell division, mild proteolysis removes these connections resulting in Golgi unstacking. In The daughter cells, these proteins help reassemble the unstacked Golgi.
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
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.
Multi-pass Transmembrane Proteins and β-barrels
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
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...

