小分子,ペプチド,タンパク質にカルボランをパラジウム媒介で組み込む
Martin Gazvoda1, Heemal H Dhanjee1, Jacob Rodriguez1
1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|April 19, 2022
まとめ
研究者たちは,カルボランを分子やタンパク質に結合させる新しいパラジウム触媒方法を開発しました. このテクニックは,ボロン密度の高いグループをターゲットに提供することで,ボロン中性子捕獲療法を強化します.
科学分野:
- 薬剤化学
- 生物結合化学
- ボロン中性子捕獲療法
背景:
- カルボランは,特にボロン中性子捕獲療法において,有意な治療効果を示しています.
- ペプチドやタンパク質のようなバイオ分子にカルボランを組み込むには限られた方法がある.
研究 の 目的:
- 小分子,ペプチド,タンパク質にカルボラン分子を設置するための一般的で効率的な戦略を開発する.
- カルボランを標的型療法に用いることが可能になるため,水害性などの課題を克服する.
主な方法:
- パラジアム触媒によるC-X (X=C,S,N) 結合形成は,カルボラン装置に使用される.
- 水性バッファで室温でシステイン残基の化学選択結合.
- タンパク質結合のための水性ヒスティジンバッファで,ビスルフォン化ビアリルフォスフィンリガンドを含む特定のパラジウム反応剤を使用した.
主要な成果:
- 小分子,ペプチド,ナノボディ,アフィボディ,抗体治療薬 (トラストズマブ,セトキシマブ) にカルボランを含むグループを成功裏に設置した.
- カルボラン結合剤 (親体ZHER2,トラストズマブ) が標的抗原への結合を保持することを実証した.
- 結合タンパク質は,HER2陽性細胞系アッセイにおいて,その生物学的活性を維持した.
結論:
- 開発されたパラジウム媒介の方法は,さまざまなバイオ分子にカルボランを組み込むための多用途なアプローチを提供します.
- この戦略は,特にボロン中性子捕獲療法において,カルボランベースの治療法の進歩を容易にする.
- この方法はカルボランの水嫌性を克服し,生物分子の機能を維持し,新しい治療薬の道を開きます.
関連する概念動画
00:57Cationic Chain-Growth Polymerization: Mechanism
2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
02:43Peptide Bonds
78.2K
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
78.2K
01:20Anionic Chain-Growth Polymerization: Overview
2.2K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.2K
01:04Anionic Chain-Growth Polymerization: Mechanism
2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
01:13Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents
5.0K
Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
5.0K
01:15α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction
3.2K
The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
3.2K