对过氧化物毒理学的新见解:胞素有助于从过氧化中帮助细菌细菌的内
N Smita1, Ch Sasikala2, ChV Ramana1
1Department of Plant Sciences, School of Life Sciences, University of Hyderabad, P.O. Central University, Hyderabad 500046, India.
Journal of applied microbiology
|October 20, 2023
概括
球原蛋白保护 Bacillus subtilis 子免受过氧化 (H2O2) 的损害. 由于缺少杂草素,突变性子显示出增加的H2O2毒性和膜损伤,突出显示了杂草素的关键保护作用.
科学领域:
- 微生物学 微生物学
- 细菌生理学 细菌生理学
- 子生物学 子生物学
背景情况:
- 过氧化 (H2O2) 是一种已知会引起细胞损伤的活性氧物种.
- 细菌细菌子具有独特的保护机制,可以抵抗环境压力.
- 胞素是可能参与胞耐药性的化合物,但它们在H2O2毒性中的确切作用尚不清楚.
研究的目的:
- 为了阐明斑素在Bacillus subtilis子对过氧化 (H2O2) 毒性的耐药性中的作用.
- 为了研究导致H2O2诱导的伤害的细胞事件在野生类型和缺素的B. subtilis子.
主要方法:
- 野生型 (WT) PY79和体缺乏 (ΔsqhC突变) TB10菌株的比较分析.
- 子暴露在0.05%的H2O2中,并通过盘子计数试验评估活力.
- 微观分析,二聚烯酸 (DPA) 量化和化 (PI) 染色,以评估子完整性和膜透性.
- 脂肪酸甲基分析和蛋白质分析以确定子组成的变化.
主要成果:
- 与WT子相比,在H2O2处理后,体缺乏ΔsqhC突变子的活力下降了80%.
- 显微镜检查显示了ΔsqhC突变子的膜损伤和透性增加,由DPA缺失和PI透 (50%-75%) 证明.
- 变化的子组成和突变的增长速度减缓,以及在暴露于H2O2后在WT中增加的子烯生物合成,表明子烯的保护功能.
结论:
- 胞素形成了胞内膜的保护层,显著减轻了野生型Bacillus subtilis的H2O2不良影响.
- 在ΔsqhC突变体中缺少菌素使子更容易受到H2O2毒性的影响,强调了这种保护屏障的重要性.
相关概念视频
Endospores and Sporulation
47
Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...
47
Peroxisomes
13.3K
Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
13.3K
Gene Regulation During Sporulation
20
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
20
Oxygen Requirements and Growth Patterns
26
Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the terminal...
26
Autoxidation of Ethers to Peroxides and Hydroperoxides
7.7K
Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.
7.7K
Radical Autoxidation
2.2K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.2K


