937. 烟草尼古丁生物合成关键酶的发现与还原 episode artwork

EPISODE · Jun 28, 2026 · 23 MIN

937. 烟草尼古丁生物合成关键酶的发现与还原

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这项发表于2026年《自然·通讯》的研究揭示了烟草中尼古丁生物合成的完整路径,解决了困扰科学界百余年的难题。研究人员发现,尼古丁的形成依赖于一种**“隐性激活葡萄糖基化”机制,通过四个核心酶(NaGT、NaGR、NicGS和NicGH)组成的催化链完成。其中,葡萄糖基化并非为了最终储存,而是作为一种临时的激活手段,使底物能够顺利进行还原和环耦合反应。通过体外生化重建和植物内源验证**,科学家成功合成了具有天然立体选择性的(S)-尼古丁。此外,该研究还利用X射线晶体学解析了关键酶的结构,为调控植物碱含量及开发新型生物催化工具提供了重要理论依据。该成果不仅完善了对烟草次生代谢的认知,也为吡啶类生物碱的高效生产开辟了新途径。内容来源:https://www.nature.com/articles/s41467-026-72705-0

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937. 烟草尼古丁生物合成关键酶的发现与还原

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