ピオケリン生物合成の詰まったエピメラーゼドメインは,消滅したメチルトランスファーゼである
Trey A Ronnebaum1, Kathleen M Meneely2, Geoff P Horsman3
1Department of Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States.
Biochemistry
|August 26, 2025
まとめ
非リボソームペプチド合成酵素 (NRPS) は通常,D-アミノ酸の組み込みのためにエピメラーゼドメインを使用する. しかし,2-ヒドロキシフェニルチアゾリン天然製品の"詰め込み"エピメラーゼドメインは,触媒的に無活性であり,非機能メチルトランスファーゼであることを示唆する.
科学分野:
- 生物化学
- 分子生物学
- 自然製品化学
背景:
- 細菌と真菌は,非リボソームペプチド合成酵素 (NRPS) を用いて非リボソームペプチドを合成する.
- NRPsはしばしばD-アミノ酸を含み,ユニークな化学的性質と安定性を与えます.
- 2-ヒドロキシフェニルチアゾリンの天然製品を使用することを提案しました.
- 詰め物
- NRPSアデニレーションドメイン内のエピメラーゼドメインをステレオ化学的逆転に用いる.
研究 の 目的:
- 誘導作用を調査する
- 詰め物
- 2-ヒドロキシフェニルチアゾリンの天然産物生物合成におけるエピメラーゼ領域
- D-アミノ酸をこれらの特定のNRPに組み込むメカニズムを決定する.
主な方法:
- 2-ヒドロキシフェニルチアゾリンシデロフォールの合成された基板と製品アナログ.
- * Pseudomonas aeruginosa* (ピオケリン) と * Streptomyces venezuelae* (ワタセミシン) のアデニレーション・エピメラーゼディドメインを試験した.
- 酵素活性と,同種の酵素が欠けている酵素との比較
- 詰め物
- エピメラーゼドメイン,例えば*Pseudomonas protegens* (エナチオピオケリン) から.
主要な成果:
- 酵素はアデニル化活性を示したが,酵素エピメラーゼ活性は見られなかった.
- 2-ヒドロキシフェニルチアゾリンのエチルエステルアナログと分離された中間物質の自発的なラセミゼーションが発生しました.
- 存在するか否か
- 詰め物
- エピメラーゼ領域は,最終製品のステレオ化学と相関しなかった.
結論:
- 非正典的な
- 詰め物
- 2-ヒドロキシフェニルチアゾリン天然製品のエピメラーゼドメインは,触媒的に機能していない.
- これらのドメインはメチルトランスフェラーゼとして機能するか,進化の残骸を表す可能性があります.
- これらの経路におけるステレオ化学的逆転は,非酵素的メカニズムによって起こります.
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