サイクルペプチド抗生物質のバイオミメティック合成と最適化
Rahul M Kohli1, Christopher T Walsh, Michael D Burkart
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|August 9, 2002
まとめ
研究者らは,天然製品の生合成と固体相化学を融合させ,新しい循環ペプチド抗生物質を作成しました. この化学酵素学的アプローチはペプチドを多様化し,抗菌活動と膜選択性の強化された類似体を産生します.
科学分野:
- バイオケミストリー バイオケミストリー
- 合成生物学 合成生物学とは
- 薬用化学 薬用化学について
背景:
- マクロサイクリングは,自然界で生物活性分子の形成に不可欠です.
- マクロサイクルの酵素合成には,しばしばチオエステル結合中間物質とチオエステラゼ触媒化されたサイクリングが含まれます.
- このプロセスは,固相合成戦略を模倣しています.
研究 の 目的:
- 自然製品バイオシンセシスを組み合わせた固体相化学と統合した化学酵素法を開発する.
- 固体基板上のペプチドサイクルを触媒化するために,分離されたチオエステラーゼを使用する.
- 新規のサイクルペプチド抗生物質の類似体を生成し,評価する.
主な方法:
- 線形ペプチドの固定化は,バイオミメティック・リンクナーによる固体フェーズ・サポーター上に行われます.
- 単離されたTycCチオエステラーゼを用いたペプチドサイクライゼーションの触媒.
- 線形ペプチドの多様化により,周期性ペプチド産物のライブラリを作成します.
主要な成果:
- 孤立したチオエステラーゼが固相固定ペプチドを循環させることが実証された.
- タイロシジンAをベースとしたサイクリックペプチド抗生物質アナログのライブラリを成功裏に作成しました.
- 細菌と真核細胞の膜に対する選択性が高い同類物が特定されました.
- 一般的な細菌病原体に対する活性スペクトルの改善が観察されました.
結論:
- 開発された化学酵素学的アプローチは,天然製品の生合成と固体相化学の組み合わせを可能にします.
- この方法は,酵素メカニズムを調査し,多様なサイクルペプチドライブラリを生成するのに有効です.
- 新型アナログは,強化された抗菌特性と選択性により治療的可能性を示しています.
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