相关实验视频
Updated: Jul 18, 2025

10:36
Measurements of Physiological Stress Responses in C. Elegans
Published on: May 21, 2020
14.0K
氧化应激诱导的cgahp的特征,这是编码基氧化减少酶的基因,具有工业意义的Corynebacterium glutamicum
Meiru Si1, Mengdie Hu1, Mingfei Yang1
1College of Life Sciences, Qufu Normal University, Qufu, 273165, Shandong, China.
Biotechnology letters
|August 22, 2023
概括
在Corynebacterium glutamicum中,CgAhp酶可以防止有机过氧化物应激. 这项研究揭示了CgAhp是关键的二硫化氧降解酶,对细菌氧化应激耐受性至关重要.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 酶学 是一种酶学.
背景情况:
- 酸氧化氧化减少酶 (Ahp) 是一种基于硫醇的关键酶,可以保护细菌免受氧化应激.
- 在Corynebacterium glutamicum中,具有独特Cys-Pro-Phe-Cys活性位点的假定Ahp酶 (NCgl0877,CgAhp) 的功能仍然没有表征.
研究的目的:
- 研究Corynebacterium glutamicum中CgAhp的生理和生化功能.
- 确定CgAhp在防止有机过氧化物 (OP) 压力方面的作用及其调节机制.
主要方法:
- 基因删除研究以评估对OP压力的敏感性.
- 在压力条件下的CgAhp表达的分析.
- 生物化学测试以评估过氧化酶和还原酶活动.
主要成果:
- 删除cgahp基因显著增加了对OP压力的敏感性.
- CgAhp的表达受MarR型抑制器OasR的调节,并由压力诱导.
- CgAhp表现出弱的直接过氧化酶活性,但起到关键的还原酶的作用,通过Lpd/SucB/NADH系统支持OP排毒.
结论:
- CgAhp被确定为一种重要的氧化还原酶,参与了C. glutamicum中的细菌氧化应激耐受性.
- 该Cys-Pro-Phe-Cys活性位点对于CgAhp的还原酶功能至关重要.
- CgAhp作为过氧化酶的电子捐赠体,有助于有机过氧化物排毒.
相关概念视频
Other Stress Responses in Bacteria
33
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
33
Stringent Response in E. coli
31
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
31
Cell Specific Gene Expression
13.6K
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
13.6K

