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Institute of Chemistry, Academia Sinica – Research

環氧醌類生物合成中的立體化學控制

Epoxide Stereochemistry Controls Regioselective Ketoreduction in Epoxyquinoid Biosynthesis

J. Am. Chem. Soc. 2025, 147, 29582−29591.
Szu-Yu Wang, Kuei-Wei Chiu, Ke-Li Lin, Hsin-Yu Wei, Yu-Rong Chen, Zhijay Tu,Yi-Tzu Lin, Chun-Hung Lin,* Rong-Jie Chein,* and Hsiao-Ching Lin*

Epoxide Stereochemistry Controls Regioselective Ketoreduction in Epoxyquinoid Biosynthesis

The biosynthesis of asperpentyn was elucidated by heterologous reconstitution, total synthesis, and enzymatic assays. AtyE catalyzes stereoselective epoxidation, while AtyD and AtyC enforce site- and stereocontrolled ketoreductions. The configuration of the epoxide substrate dictates AtyD regioselectivity, with residue F97 serving as the critical determinant. Mutagenesis and one-pot reactions yielded new epoxyquinols, epoxyhydroquinones, and asperpentyn, demonstrating how enzymatic catalysis facilitates the precise and programmable construction of epoxyquinoid frameworks.

我們完整解析了天然物 asperpentyn 的生合成機制,透過異源重建、化學全合成與酵素學的跨領域研究,揭示其關鍵步驟。AtyE 執行高立體選擇性的環氧化反應,而 AtyD 與 AtyC 則分別負責位點與立體受控的酮還原。研究顯示,環氧化官能基的立體位相會直接影響 AtyD 的區域選擇性,其中 F97 位點為決定反應方向的核心開關。進一步的定點突變實驗與一鍋反應,不僅成功產生多種新型 epoxyquinol 與 epoxyhydroquinone,也有效合成出 asperpentyn。本研究不僅釐清了其生合成途徑,更展現酵素在精準掌控立體化學與建構 epoxyquinoid 骨架上的強大潛力,為開發新型天然物及其衍生物提供重要策略。