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関連する概念動画

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Protein Modifications in the RER01:26

Protein Modifications in the RER

Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Drug Metabolism: Phase II Reactions01:14

Drug Metabolism: Phase II Reactions

Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...

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関連する実験動画

Updated: Jul 1, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

系統的に改変されたRu (II) -Os (II) オリゴヌクレオチドにおけるドナー/受容体相互作用

Dennis J Hurley1, Yitzhak Tor

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358, USA.

Journal of the American Chemical Society
|October 31, 2002
PubMed
まとめ

DNA複合体におけるドナー/受容体の相互作用は,ルテニウム (ruthenium) とオスミウム (osmium) の核酸化物を用いて研究された. エネルギー伝送メカニズムが分析され,フォースター二極二極伝送が支配的であり,短距離でのデクスターメカニズムによる潜在的貢献が示されました.

科学分野:

  • フォトケミストリーとフォト物理学
  • 超分子化学 超分子化学
  • 生物物理化学 生物物理化学

背景:

  • ドナー/受容体 (D/A) 相互作用は,エネルギー転送プロセスにおいて極めて重要です.
  • DNAデュプレックスは,その定義された構造により,分子相互作用を研究するための多用途の支架を提供します.
  • DNAのエネルギー伝達メカニズムを理解することは,新しい分子装置と探査機の開発に不可欠です.

研究 の 目的:

  • 改変DNA複合体におけるドナー/受容体 (D/A) 相互作用を調査する.
  • DNAブリッジシステムにおける支配的なエネルギー伝達機構 (フォースター対デクスター) を解明する.
  • エネルギー転送ダイナミクスに対するリンクアーの硬さの影響を分析する.

主な方法:

  • 異なる距離でエチニル結合のRu(II) ドナーおよびOs(II) アクセプターヌクレオシドを持つ19メルのDNA二重複の合成.
  • 静止状態と時間解像度のルミネセンスのスペクトロスコピーは,消火と興奮状態の寿命を測定します.
  • フォースター・メカニズムとデクスター・メカニズムを用いたエネルギー移転の分析,指向因子の考慮を含む.

主要な成果:

  • Ru(II) 発光抑制は,ドナーと受容体 (16 Å から 61 Å) の分離が増加するにつれて減少した.

さらに関連する動画

Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor
07:12

Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor

Published on: October 26, 2017

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

関連する実験動画

Last Updated: Jul 1, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor
07:12

Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor

Published on: October 26, 2017

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

  • 興奮状態の寿命は,消火効率と線形相関を示した.
  • 分析では,フォースター二極二極のエネルギー伝達が主なメカニズムであると示され,偏差は方向性因子による可能性がある.
  • 硬いリンクを柔軟なリンクに交換することで,フォースター機構の相関性が改善されました.
  • 驚くことに,デクスターメカニズム分析も良好な相関性を示し,D/A相互作用の解釈の複雑さを強調した.

    • 結論:

    • フォースター二極二極エネルギー伝達は,これらのDNA複合体におけるD/A相互作用の支配的な経路である.
    • デクスター電子交換メカニズムからの小さな寄与は,短い距離で発生する可能性があります.
    • この研究は,フォースター系がデクスターのような行動を示す可能性を強調し,DNAブリッジダイアードの過度に単純化されたモデルに注意を喚起しています.