関連する実験動画
Updated: Feb 15, 2026

11:28
Analytical Techniques for Assaying Nitric Oxide Bioactivity
Published on: June 18, 2012
18.5K
非ヘム二酸化鉄複合体による酸化窒素減少の半減メカニズム:フラボ鉄酸化窒素還元酵素のモデル化
Corey J White1, Amy L Speelman1, Claudia Kupper2
1Department of Chemistry, The University of Michigan , Ann Arbor, Michigan 48109-1055, United States.
Journal of the American Chemical Society
|January 20, 2018
まとめ
フラボ鉄酸化窒素還元酵素 (FNORs) は,酸化窒素 (NO) をN2Oに還元する. モデル・コンプレックスは,この減少が半減メカニズムによって効率的に起こることを示し,細菌の耐性や合成触媒の洞察を提供している.
科学分野:
- バイオ有機化学
- 酵素メカニズム
- カタリシス
背景:
- フラボ鉄酸化窒素還元酵素 (FNORs) は,窒素酸化物 (NO) をN2Oに減らすことで,病原性細菌に対する生存を可能にする.
- FNORによるNO減少のメカニズムの理解は,細菌感染に対する戦略の開発と新しい合成触媒の設計に不可欠です.
研究 の 目的:
- FNOR活性部位を模倣した二鉄ディニトロシルモデル複合体[Fe2(BPMP) ((OPr) ((NO) 2) の反応性を光譜的に特徴付け,研究する.
- このモデル複合体によって酸化窒素 (NO) を酸化窒素 (N2O) に還元するメカニズムと効率を解明する.
主な方法:
- 紫外線スペクトロスコピー
- サイクルボルトメトリ
- スペクトロ電気化学
- イソトープのラベル付け研究
主要な成果:
- モデル・コンプレックスは,高速度の定数 (k > 10 2 s -1 ) を持つ半減メカニズムを用いて,単一の還元等価を用いて,NOをN 2 Oに量的に還元する.
- イソトープの標識は,急速な還元と低いN-N結合形成障壁と一致する分子内N-N結合機構を確認した.
- 反応は -80 °Cで効率的に進行し,混合価の中間物質の観察を可能にします.より高い温度では,製品が腐敗します.
結論:
- 半減メカニズムは,FNORと合成触媒におけるNOをN2Oに還元するための非常に効率的な経路である.
- [Fe2(BPMP) ((OPr) ((NO) 2) ]2+複合体によるNO減少に関する詳細なメカニズム的な洞察が得られ,FNOR活性サイトモデルとしての役割を検証した.
関連する概念動画
Nitric Oxide Signaling Pathway
6.4K
Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
6.4K
Oxidation-Reduction Reactions
75.9K
Oxidation–Reduction Reactions
75.9K
Oxidation Numbers
43.3K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
43.3K
Oxidation and Reduction of Organic Molecules
9.5K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
9.5K
Pyruvate Oxidation
169.6K
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
169.6K
Reactions at the Benzylic Position: Oxidation and Reduction
5.1K
The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
5.1K

