水溶液中のD-グルコゾンのリン酸触媒分解は,C1-C2トランポジションが伴います
Wenhui Zhang1, Anthony S Serianni
1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
Journal of the American Chemical Society
|June 2, 2012
まとめ
D-グルコゾンの分解にはC1-C2結合の割れがあり,d-リブルースとフォーマットが生成されます. 非有機リン酸は,糖分分解の共通項であるC1-C2転移を含むことができるこのプロセスを触媒化します.
科学分野:
- 炭水化物の化学反応
- バイオケミストリー バイオケミストリー
- オーガニック化学 オーガニック化学
背景:
- 1,2-ジカルボニル糖 (オゾン) は,炭水化物の代謝における反応性中間物質である.
- それらの分解経路を理解することは,代謝過程と潜在的な疾患メカニズムを明らかにするために非常に重要です.
研究 の 目的:
- 水溶液中のD-グルコゾン (D-アラビノ-ヘクソス-2-ウロース) の分解経路を調査する.
- D-グルコゾン分解における無機リン酸塩の役割を明らかにし,新しい反応機構を特定する.
主な方法:
- 使用された (13) Cおよび (1) H核磁共振 (NMR) スペクトロスコーピー.
- 詳細なメカニズム研究のためにD-グルコゾンの単体および二重 (13) Cラベル付き同位体を使用した.
- pH 7.5 と 37 °C の水性リン酸バッファでの分解を調査し,リン酸またはアルセネートを含有または含有していない.
主要な成果:
- D-グルコゾンは,最初のC1-C2結合割れを経て,d-リブルースとフォーマットに分解し,その3-デオキシアナログとは異なり,d-リブルースとフォーマットに分解します.
- C3でのエノリゼーションによって形成される1,3-ディカルボニル中間体は,C1-C2結合の割れ前に存在します.
- 降解中に予想外のC1-C2トランスポーゼーションが観察され,約10%の変容で発生しました.
- 分解は,無機リン酸 (P(i)) とアルセネートによって触媒化されます.
- C1-C2変換はD-キシロゾンにも観察され,C3-ヒドロキシル化1,2-ジカルボニル糖類に共通することを示唆しています.
結論:
- D-グルコゾンの分解は,C1-C2結合の割れと潜在的なC1-C2トランスポーゼーションを含む新しい経路を経由します.
- 無機リン酸は触媒的な役割を果たし,おそらく可逆性リン酸添加物形成によるものである.
- この発見は,P(i) 触媒によるD-グルコゾンの分解が,C1-C2の転置を含む可能性があることを示唆している.
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