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関連する概念動画

Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Signal Transduction: Overview01:26

Signal Transduction: Overview

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Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...
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Updated: Apr 16, 2026

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
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Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET

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トランジエントメディエーターを用いたリガンド活性化メタ-C-H活性化.

Xiao-Chen Wang1, Wei Gong1, Li-Zhen Fang1

  • 1Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, USA.

Nature
|March 11, 2015
PubMed
まとめ

研究者らは,トランジントメディエーターとしてノルボルネンを用いて,メタ選択的なC-H活性化のための新しい方法を開発しました. このアプローチにより,C−H機能化反応におけるオルト・セレクティブからメタ・セレクティブへの切り替えは,触媒制御を通じて可能になる.

さらに関連する動画

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
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Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors
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関連する実験動画

Last Updated: Apr 16, 2026

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
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Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
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Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors
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Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors

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科学分野:

  • 有機化学 オーガニック・ケミストリー
  • カタリシス カタリシス カタリシス
  • 合成方法論 合成方法論

背景:

  • 誘導C-H活性化は,通常,近接C-H結合機能化のための誘導グループに依存する.
  • 遠隔C-H結合 (メタポジション) を活性化することは,幾何学的制約のために困難です.
  • 以前の方法は,複合的で,共振的に結合されたテンプレートを必要とし,合成の有用性を制限していました.

研究 の 目的:

  • メタ選択的C-H活性化のためのよりシンプルで汎用的な方法を開発する.
  • 既存のC-H活性化戦略の限界を克服するために.
  • オーソ・セレクティブとメタ・セレクティブの間の触媒制御された切り替えを実証するために.

主な方法:

  • ノルボルネンをC-H活性化のための一時的な媒介体として利用する.
  • パラジウム触媒に新しいピリジン基リガンドを用いること.
  • オーソからメタポジションへの触媒リレーのメカニズムを調査する.

主要な成果:

  • シンプルなオーソ・ディレクティング・グループとノルボネンを使って,メタ・セレクティブのC-H活性化を達成した.
  • 触媒システムを改変することによって,オルトからメタに選択性を切り替える能力を実証しました.
  • 触媒変換におけるこの一時的な媒介者のアプローチの広範な適用性を示した.

結論:

  • ノルボルネンは,メタ選択的C-H活性化を達成するための効果的な一時的な媒介体として機能します.
  • この方法は,テンプレートに依存する戦略よりも著しく進歩しています.
  • 触媒制御は,C-H機能化の選択性を指示するための強力なツールを提供します.