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在皮埃里西丁生物合成中调整过早释放的多基基介质

Hattan A Alharbi¹, Muhammad Amin¹, Kh Ahammad Uz Zaman¹

¹Department of Pharmaceutical Sciences, Oregon State University, Corvallis, Oregon 97331-3507, United States.

Journal of natural products

|July 28, 2025

概括

研究人员从一个突变的Streptomyces pactum中确定了四种不完整的piericidin polyketide中间体. 这揭示了多基化合成酶.

科学领域:

微生物学微生物学
自然产品化学自然产品化学
生物化学生物化学

背景情况:

皮埃里西丁是微生物多基类天然产物,具有多样化的生物活性.
皮里西丁的生物合成基因集群 (BGC) 在Streptomyces物种中发现.
在Streptomyces pactum中的piericidin BGC涉及六个模块化多基合成酶 (PKS) 和五个修饰酶.

研究的目的:

为了研究piericidin PKS.的基质特异性和杂交性.
为了识别和表征过早的多基酸中间体.
了解定制酶在修改短链多基基菌中的作用.

主要方法:

对Streptomyces pactum进行基因操纵,以非激活 pieA5 基因.
使用突变菌株和失活的主要生物合成途径分析聚基酸中间体.
孤立化合物的结构阐明 1-4.

主要成果:

在 pieA5 基因失活后,确定了四种过早的多基基类中间体 (1-4).
化合物1-3使用异基启动单元,而化合物4使用乙烯基启动单元.
观察到不同的终端功能 (碳酸,胺) 和修饰 (C-2甲基,环氧化物).

结论:

皮里西丁PKS可以释放不完整的多基酸中间体.
定制酶在修改这些短链多基基菌中表现出杂乱性.
这项研究提供了关于多基基生物合成和修饰的灵活性的见解.

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