一个电子分叉"插头"到一个蛋白质纳米线在取决于的化物排毒中
Xiang Feng1, Gerrit J Schut2, Saisuki Putumbaka2
1Department of Structural Biology, Van Andel Institute, Grand Rapids, MI 49503.
概括
在肠道微生物中,含的氧化还原酶 (WOR) 形成独特的 WorABCSL 复合体. 低温电磁探测揭示了一种纳米线结构,将化氧化与能源生产联系起来,影响肠道健康和环境过程.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 微生物学 微生物学
背景情况:
- 含的氧化还原酶 (WORs) 与皮素 (Tuco) 辅因子是关键的酶.
- 细菌WORs可以形成嵌合式WorABCSL复合体,执行电子二叉反应.
- 这些复合物参与了阿尔德海德排毒和人类肠道中短链脂肪酸的产生.
研究的目的:
- 通过使用冷电子显微镜 (cryo-EM) 来确定来自*Acetomicrobium mobile*的WorABCSL复合物的高分辨率结构.
- 为了阐明这种嵌合酶的电子二叉活动的结构基础.
主要方法:
- 从Acetomicrobium mobile*中净化WorABCSL复合物,使其成为一个可靠的生物.
- 高分辨率低温电子显微镜 (cryo-EM) 用于结构确定.
主要成果:
- 冷-EM结构揭示了WorABC和WorSL子单元之间的一种新的1:3固体测量.
- WorSL单元形成了一个类似纳米线的架构,将来自 WorL 中多个 Tuco 站点的电子引导到单个 WorABC 核心.
- 在WORS内部的多个铁硫团促进了电子转移.
结论:
- 独特的结构布局将三个图科依赖的化氧化位点与电子分支过程联系起来.
- 这种结构提供了对环境化物的氧化和WORs在肠道微生物中的代谢作用的见解.
- 这些发现表明,在Acetomicrobium mobile*中有一种有效的能量转化和排毒机制.
相关概念视频
Aldehydes and Ketones to Alkenes: Wittig Reaction Overview
The Wittig reaction is the conversion of carbonyl compounds-aldehydes and ketones-to alkenes using phosphorus ylides, or the Wittig reagent. The reaction was pioneered by Prof. Georg Wittig, for which he was awarded the Nobel Prize in Chemistry.
Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism
The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...


