乙转移酶介导的聚基胺从真菌大合成酶释放出来
Xinkai Xie1, Michael J Meehan, Wei Xu
1Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, USA.
Journal of the American Chemical Society
|June 18, 2009
概括
研究人员阐明了真菌酶LovF如何使用乙转移酶LovD释放产物. 这种由乙转移酶介导的释放机制提高了生产降胆固醇药物洛瓦斯塔丁的催化效率.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 菌类学 菌类学是指菌类学.
背景情况:
- LovF是一种来自Aspergillus terreus的高降解聚基酸合成酶 (HR-PKS),合成了用于生产洛瓦斯的关键侧链.
- 洛瓦斯塔丁是一种具有降胆固醇特性的天然产品,是由LovF合成的α-S-甲基酸盐侧链衍生而来的.
研究的目的:
- 在体外表达和复制LovF的酶活性.
- 调查和确认从LovF ACP领域卸载diketide产品的机制.
- 描述LovF与乙烯转移酶LovD之间的相互作用及其在产品转移中的作用.
主要方法:
- 全长LovF酶的表达方式.
- 在体外复制大合成酶活动.
- 在LovF和LovD之间进行了蛋白质-蛋白质相互作用研究.
- 酶动力学以确定催化效率.
主要成果:
- 狄基产物通过离合性转移酶LovD.有效地从LovF ACP域卸载.
- 这是第一个报告的,由转移酶介导的,由真菌PKS释放出多基化物产物的案例.
- LovD主要与LovF的ACP域相互作用,导致与N-乙基胺相比,催化效率提高了约1×106倍.
结论:
- 这项研究揭示了真菌HR-PKS的新型乙转移酶介导的卸载机制.
- 这种机制显著提高了聚基化物产品转移的效率.
- 这些发现为真菌HR-PKS酶的功能机制提供了新的见解.
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