水性エネ型反応によるチロシン生物結合:チロシンのためのクリックのような反応
Hitoshi Ban1, Julia Gavrilyuk, Carlos F Barbas
1The Skaggs Institute for Chemical Biology, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Journal of the American Chemical Society
|January 14, 2010
まとめ
科学者たちは,サイクルダイアゾジカルボキシアミドを用いた新しい水性チロシン結合反応を開発した. この多用途な方法は,ペプチドとタンパク質を効率的に改変し,生物結合と抗体開発における新しい応用を可能にします.
科学分野:
- 有機化学 オーガニック・ケミストリー
- バイオケミストリー バイオケミストリー
- 化学生物学 化学生物学とは
背景:
- 選択的で効率的な化学反応を開発して,水性環境におけるバイオ分子を変更することは極めて重要です.
- タイロシン改変のための既存の方法は,しばしば範囲,条件,またはネイティブの生物学的システムとの互換性において制限があります.
研究 の 目的:
- 選択的チロシン結合のためのサイクルダイアゾジカルボキシアミドの新しいクラスについて報告する.
- この反応がペプチドやタンパク質を改変するために,水中媒体での有用性を実証する.
- 双特定抗体の作成におけるその応用を探求する.
主な方法:
- 新型循環型ダイアゾジカルボキシアミドの合成.
- フェノールとチロシンを含むペプチドとの反応機構の調査.
- バッファ水溶液中の原生酵素と抗体に対する結合反応の適用.
主要な成果:
- 周期性ダイアゾジカルボキシアミドがフェノールとチロシンで効率的かつ選択的にエネのような反応をする.
- 反応は,広範囲のpH範囲で,温和な水性条件下で進行します.
- 本来の酵素と抗体のラベル付けに成功し,生物学的システムとの互換性を実証しました.
- 双特定抗体への新しい合成経路を示した.
結論:
- 多用途で軽度の水性チロシン結合反応が確立されています.
- この方法は,生物結合のための利用可能な化学物質を大幅に拡張します.
- この反応は,ペプチドとタンパク質化学の広範な応用と,フェノールを含む化合物の改変に希望を示しています.
関連する概念動画
Keto–Enol Tautomerism: Mechanism
The keto and enol forms are known as tautomers and they constantly interconvert (or tautomerize) between the two forms under acid or base catalyzed conditions. Both the reactions involve the same steps—protonation and deprotonation— although in the reverse order.
Enzyme-linked Receptors
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Conjugate Addition to α,β-Unsaturated Carbonyl Compounds
α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview
The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
Phase II Reactions: Sulfation and Conjugation with α-Amino Acids
Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme activation, sulfur...
Reactivity of Enols
Enols are a class of compounds where a hydroxyl group is attached to a carbon–carbon double bond, which implies that it is a vinyl alcohol. A carbonyl compound with an α hydrogen undergoes keto–enol tautomerism and remains in equilibrium with its tautomer, the enol form. Usually, the keto tautomer is present in a higher concentration than the enol tautomer due to the higher bond energy of C=O compared to C=C. Moreover, the direction of the keto–enol equilibrium is governed by factors like...


