バシルス・サブティリスのこれまで未知のカノサミンの生物合成経路
Natasha D Vetter1, David M Langill, Shazia Anjum
1Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, Canada, S7N 5C9.
Journal of the American Chemical Society
|April 17, 2013
まとめ
バチルス・サブティリスの酵素NtdA,NtdB,NtdCは,グルコース-6-リン酸からカノサミンを合成する. この発見は,これまで知られている経路とは異なる新しい抗生物質生物合成経路を明らかにしています.
科学分野:
- 微生物学 微生物学とは
- バイオケミストリー バイオケミストリー
- 酵素学 酵素学とは
背景:
- バシルス・サブティリスのntdオペロンは,抗生物質の性質を持つディサハリドである3,3'-ネオトレハロサジアミン (NTD) の合成に不可欠です.
- このオペロン内のNtdA,NtdB,およびNtdC酵素の特異的な機能は,以前in vitroでは特徴づけられていなかった.
研究 の 目的:
- バチルス・サブティリスからのNtdA,NtdB,およびNtdCのインビトロ酵素的機能を明らかにする.
- バチルス・サブティリスのカノサミン生物合成のための新しい経路を特徴づける.
主な方法:
- 精製されたNtdA,NtdB,およびNtdCの触媒活性を決定するために,酵素測定を行った.
- 生物化学的経路を定義するために,基板特異性と反応産物を分析した.
主要な成果:
- NtdCは,グルコース-6-フォスファート3-デヒドロゲンゼとして特定されました.
- NtdAは,ピリドクサールリン酸に依存する3オキシグルコース6リン酸:グルタミン酸アミノトランスフェラーゼとして機能する.
- NtdBはカンノサミン-6-リン酸ファスファタゼとして作用し,グルコース-6-リン酸からカンノサミン生物合成経路を完了します.
結論:
- この研究は,NtdA,NtdB,NtdCによって触媒化されたBacillus subtilisのカノサミン生物合成のための新しい酵素経路を示しています.
- この経路は,アミコラトプシス・メディテラネイで見られるUDP-グルコース依存経路と比較して,カノサミン生成の代替経路を表しています.
- この発見は,抗生物質の潜在的応用を持つ異常な砂糖の生物合成に関する新しい洞察を提供します.
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