モルルギンはフェノールチオールと反応するが,フェノールチオールプローブによって発見されたシステインの修正を生成しない
Tao Liu1,2, Ruibing Qi1,2, Wanshi Feng1,2
1Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.
Frontiers in cell and developmental biology
|September 5, 2025
まとめ
この研究では,新しい天然製品を検出するために使用されるフェノールチオール探査機は,予想とは異なる反応を示しています. 彼らはヒドロキシル基を組み込み,システイン反応性化合物の発見においてその使用を制限する.
科学分野:
- 自然製品化学
- 化学生物学
- マススペクトロメトリー
背景:
- 電子性天然産物 (NP) と代謝産物は,タンパク質内のシステイン残基を変化させ,生物学的活動に影響を与えます.
- システインのチオール反応性を模倣する化学探査機は,新しいNPと代謝物を発見するのに役立ちます.
- 既存の探査機は,電化添加によって反応し,誘導体の質量スペクトロメトリー (MS) 分析を可能にします.
研究 の 目的:
- フェノールチオール探査機とモルギンおよび関連するNPの反応機構を調査する.
- システインに反応する天然物質を特定するためのフェノールチオールプローブの有用性を評価する.
主な方法:
- フェノール・チオール・プローブの合成と適用
- モルルギンと構造的に関連した天然製品との反応
- 質量スペクトロメトリーを用いた反応誘導体の分析.
主要な成果:
- フェノールチオール探査機はモルギンと反応したのは,単純な添加ではなく,電離性自由基添加メカニズムでした.
- 誘導体はチオルの探査機と 予期せぬヒドロキシル基を含んでいた
- この反応経路は,意図されたシステインミミクリーとは異なる.
結論:
- フェノール・チオール探査は,すべてのケースでシステインの反応性を正確に表さない場合があります.
- 観測された反応メカニズムは,この探査機タイプを使用して新しいシステイン反応性天然製品の発見を制限する.
- 化学探査のさらなる開発は,より広範な天然製品の発見のために必要である.
関連する概念動画
Preparation and Reactions of Thiols
6.7K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
6.7K
Preparation and Reactions of Sulfides
5.1K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.1K
Structure and Nomenclature of Thiols and Sulfides
5.0K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
5.0K
Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation
367
Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
Several distinctive characteristics distinguish glutathione conjugation from other phase II...
Several distinctive characteristics distinguish glutathione conjugation from other phase II...
367
Phase II Reactions: Methylation Reactions
335
Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
335
Oxidation of Phenols to Quinones
3.4K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
3.4K


