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サイアノバクテリアにおけるリボソームペプチドプレニレーションの酵素的基礎
John A McIntosh1, Mohamed S Donia, Satish K Nair
1Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.
Journal of the American Chemical Society
|July 20, 2011
まとめ
研究者らは,サイアノバクチンと呼ばれる周期性ペプチドを改変するプロニルトランスフェラーゼ酵素であるLynFを特定した. この発見は,成熟したペプチドのプレニル化とクライゼン再編成機構を含む天然製品バイオシンセシスの新しい経路を明らかにしています.
科学分野:
- バイオケミストリー バイオケミストリー
- 自然製品バイオシンセシス 自然製品バイオシンセシス
- 酵素学 酵素学とは
背景:
- リボソームペプチド天然産物のプレニル化のための酵素機構は,大部分が特徴づけられていない.
- プレニレーションは,多くの生物活性天然製品の生物合成における重要な翻訳後の修正である.
研究 の 目的:
- リボソームペプチドプレニレーションの酵素的基礎を解明する.
- プレニルトランスフェラーゼLynFとシアノバクチン生物合成におけるその役割の特徴.
- 自然製品におけるC-プレニレーションのメカニズムを調査する.
主な方法:
- LynF.の酵素特性について
- サイクルペプチドにおけるチロシン,セリン,セロニン残基のプレニル化分析.
- プレニルチルチロシン誘導体のクライスン再配列の調査.
主要な成果:
- TruF酵素ファミリーの新型プレニルトランスフェラーゼであるLynFの特徴が示されました.
- LynFは,リーダー配列から独立して,成熟したマクロサイクルペプチドでチロシンを逆O-プレニル化します.
- リバースO-プレニルチロジンは,C-プレニルチロジンを生成するためにクライゼン再配列を経て,新しい生物合成経路を示しています.
結論:
- TruF酵素ファミリーは成熟したサイクルペプチドをプレニラートし,翻訳後の修正のためにリーダー配列を必要とする従来のモデルに挑戦しています.
- クライゼン再配列メカニズムは,以前は化学的に予想された経路である天然製品バイオシンセシスにおけるフェノールC-プレニレーションを駆動する.
- この研究は,プレニル化天然製品の生物合成に関する新しい洞察を提供し,酵素機能の理解を広げています.
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