CarRS 两组件系统对多素B至关重要 Vibrio vulnificus 的耐药性对多个宿主环境信号作出反应
Duhyun Ko1, Dayoung Sung1, Tae Young Kim1
1National Research Laboratory of Molecular Microbiology and Toxicology, Department of Agricultural Biotechnology, Seoul National University, Seoul, Republic of Korea.
Microbiology spectrum
|June 8, 2023
概括
菌的CarRS双组件系统 (TCS) 增强了对抗微生物和其他宿主压力的耐药性. 这个系统对于细菌在宿主环境中的生存和感染至关重要.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 分子生物学分子生物学
背景情况:
- 肠病原细菌利用两组系统 (TCS) 适应宿主环境并抵抗天生的免疫力.
- 机会性病原体Vibrio vulnificus对聚素B (PMB) 等离子抗微生物 (CAMPs) 呈现耐药性,但基本的TCS机制尚不清楚.
研究的目的:
- 为了研究对维布里奥性菌对多素B (PMB) 的耐药性负责的TCS.
- 阐明CarRS TCS对各种宿主环境压力的抵抗能力的调节机制.
主要方法:
- 对转子子子突变库的查,以确定参与PMB耐药性的基因.
- 转录组分析以确定CarR调节的基因.
- 电泳运动转移试验 (EMSAs) 用于研究CarRDNA结合.
- 评估细菌对PMB,胆盐和酸性pH的耐药性.
主要成果:
- 卡尔RS TCS,特别是响应调节器CarR,对于V. vulnificus中PMB耐药性至关重要.
- 卡尔直接激活eptA操作子的表达,这对PMB抗性至关重要.
- 传感器酶CarS对CarR的酸化是下游基因调节和PMB抵抗所需的.
- 此外,CarRS TCS还能抵抗胆盐和酸性pH值,其激活状态由这些压力调节.
结论:
- 卡尔斯TCS为Vibrio vulnificus提供了多重压力耐药性,在宿主感染期间增强了其生存和健康.
- 卡尔能够对各种环境信号作出反应,这使得V. vulnificus能够在宿主体内适应和繁荣.
- 了解CarRS TCS提供了细菌适应策略和潜在的治疗点的见解.
相关概念视频
Global Regulatory Systems
45
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
45
Other Stress Responses in Bacteria
34
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...
34
Bacterial Signaling
33.0K
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
33.0K
Gene Regulation in Microbial Communities: Quorum Sensing
51
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
51
Defense Against Bacterial Pathogens
1.5K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.5K
Stringent Response in E. coli
32
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...
32


