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来自Bacillus cereusus的皮酸环化前体的基因拦截和结构特征
Albert A Bowers1, Christopher T Walsh, Michael G Acker
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Journal of the American Chemical Society
|August 17, 2010
概括
研究人员确定了TclM酶,该酶负责形成硫素抗生素中的氨酸核. 破坏tclM允许隔离非循环前体,证实了tclM的存在.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 自然产品的合成自然产品的合成
背景情况:
- 西林是一种抗生素类,其特点是具有独特的皮里丁核.
- 这种皮里丁核的形成机制,特别是拟议的脱氨酸的尾到尾凝结,仍然未得到证实.
- 人们假设TclM酶是一种生物.
- 迪尔斯-阿尔德拉塞斯公司
- 参与了这个循环化过程.
研究的目的:
- 阐明TclM酶在西林生物合成中的作用.
- 为了识别和表征氨酸化环的前体.
- 为了确认拟议的皮里丁核形成机制.
主要方法:
- 在产生硫素的菌株中,tclM基因的遗传破坏.
- 由于tclM中断而积累的非循环前体的分离和表征.
- 对已分离的前体的翻译后修饰的分析.
主要成果:
- 对tclM的破坏导致了对化环的非循环前体的积累.
- 这些前体呈现出完整的翻译后修饰,包括脱丁氨酸, thiazoles 和 dehydroalanines.
- 在分离的产品中观察到领导的广泛的N-终端降解和N-化.
- 鉴定出TCLM及其同类酶是催化关键的跨环球异能注射的酶.
结论:
- 证实TclM是通过跨环状异能注射在硫素中形成氨酸核的酶.
- 该研究提供了直接证据,证明了涉及脱水氨酸的提议后期凝结机制.
- 这些发现提供了关于 thiazolyl 的生物合成和设计新抗生素的潜在目标的见解.
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