通过E.E.对的同化 在哺乳动物肠道中的大肠杆菌
Sudhir Doranga1,2, Tyrrell Conway1
1Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma, USA.
mBio
|February 21, 2024
概括
大肠杆菌 (Escherichia coli) 用多个源来进行肠道殖民,其中L-胺是最关键的. 这项研究确定了使大肠杆菌能够生长的关键营养素.
科学领域:
- 微生物学 微生物学
- 我们的肠道微生物组.
- 细菌生理学 细菌生理学
背景情况:
- 对于所有生物体至关重要,包括大肠杆菌 (E. coli).
- 虽然已知大肠杆菌殖民的碳和能量来源,但其源在很大程度上仍然没有特征.
- 肠道环境为大肠杆菌提供了丰富的潜在源.
研究的目的:
- 为了识别大肠杆菌在菌素治疗小鼠肠道的殖民期间使用的特定源.
- 调查的可用性是否是大肠杆菌在小鼠肠道中定居的限制因素.
- 确定已识别的源对大肠杆菌生存和繁殖的相对重要性.
主要方法:
- RNA测序 (RNA-seq) 用于识别殖民的大肠杆菌中的上调基因.
- 竞争性殖民化试验评估营养利用突变物对大肠杆菌殖民性的影响.
- 营养补充的救援实验,以验证特定源的作用.
主要成果:
- 在小鼠肠道中没有限制,这是NtrBC regulon的最小诱导所表明的.
- 大肠杆菌利用L-氨酸,N-乙氨基酸,N-乙糖胺和二/三作为主要源.
- 氨酸是最重要的源,其脱氨酶突变体显示出显著的殖民缺陷.
- N-乙神经胺酸作为碳和的来源,而酸盐和氨是次要的来源.
结论:
- 大肠杆菌利用各种各样的源来进行肠道殖民.
- L-氨酸是主要的源,支持大肠杆菌在小鼠肠道中的殖民.
- 了解这些营养依赖关系可以为控制大肠杆菌殖民的策略提供信息.
相关概念视频
01:20Overview of Nitrogen Metabolism
7.9K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
7.9K
01:49The Nitrogen Cycle
52.1K
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
52.1K
01:29Bacterial Flora of the Large Intestine
446
The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
446
02:24Comparative Excretory Systems
19.3K
Animals have evolved different strategies for excretion, the removal of waste from the body. Most waste must be dissolved in water to be excreted, so an animal’s excretory strategy directly affects its water balance.
19.3K