乳素481合成酶在兰地生物生产过程中化其基质
Champak Chatterjee1, Leah M Miller, Yong L Leung
1Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Journal of the American Chemical Society
|November 3, 2005
概括
乳素481合成酶 (LctM) 使用ATP酸化氨酸/氨酸残留物,启动抗生素合成. 这一酸化步骤对酶至关重要.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 分子生物学分子生物学
背景情况:
- 乳素-481合成酶 (LctM) 是一种双功能酶,对于产生多环状乙烯抗生素乳素-481.1至关重要.
- LctM催化了Ser/Thr残留物的脱水和随后的Cys结合物添加,形成脱水氨基酸和乙烯键.
- LctM初始激活步骤的精确机制,特别是它的ATP依赖性,需要进一步阐明.
研究的目的:
- 调查ATP在由乳素481合成酶 (LctM) 催化的初始酶的作用.
- 为了确定ATP是否直接参与基质残留物的脱水或酸化.
- 阐明LctM启动乳素合成的机制 481.1.
主要方法:
- 用截断的基质化LctM的化.
- 使用质谱学和色谱学分析反应产品.
- 用合成和ADP作为辅基质进行酶分析.
主要成果:
- 用LctM化的截断基板在脱水区域被酸化.
- 含有合成索/索胺的被LctM接受为基质.
- 酸盐的消除和脱水氨基酸的形成仅在ADP存在时才发生,这表明ATP用于酸化.
结论:
- 乳素481合成酶 (LctM) 利用ATP对化的目标Ser/Thr残留物,这是乳素481生物合成的关键初始步骤.
- 依赖ATP的酸化,而不是转位或循环,似乎是主要的ATP消耗反应.
- 这些发现揭示了通过酶介导酸化启动乙烯抗生素合成的新机制.
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