对二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化二氧化
Hui Shan1, Michael J R Segura, William K Wilson
1Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005, USA.
Journal of the American Chemical Society
|December 22, 2005
概括
这项研究揭示了二氧化二二 (DOS) 可以被植物酶循环,产生新型三烯. 这些发现表明产生多种植物代谢物和演变的氨酸合成的新途径.
科学领域:
- 生物化学 生物化学
- 植物科学 植物科学
- 代谢学 代谢学 代谢学
背景情况:
- 氧化二二烯循环 (OSCs) 通常从2,3-(S) -氧化二二烯 (OS) 中合成三二烯.
- 一种较小的基质, (3S,22S) -2,3:22,23-二氧化二素 (DOS),也可以通过OSCs循环.
- 了解DOS循环是探索植物三二生物合成多样性的关键.
研究的目的:
- 为了研究植物三烯合成酶对DOS的循环化.
- 阐明DOS循环化的机械路径和产品.
- 探索DOS路径在沙因合成中的进化含义.
主要方法:
- 在酵母中,复合醇合成酶 (LUP1) 的异质表达.
- 用3S,22S-DOS化LUP1并分析循环化产品.
- 使用核磁共振 (NMR) 和气色谱-质谱法 (GC-MS) 阐明结构.
- 量子力学计算用于研究反应中间体.
主要成果:
- LUP1催化了DOS的循环,产生了环氧达玛兰和一个环氧巴卡兰.
- 该反应遵循了DOS循环的新机制范式,涉及氧离子中间体.
- 纠正了先前的环氧亚马兰文献中的错误,并确定了沙宁糖的潜在前体.
- 在酵母中产生了大量的DOS代谢物,突出了DOS分流通路的作用.
结论:
- DOS在三烯合成中发挥着重要作用,扩大了二次代谢产物的多样性.
- DOS分流通路对氨酸合成的演变至关重要.
- 生物可以通过利用像DOS这样的替代基质来增加代谢多样性,而无需进化新的酶.
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