通过抑制双组分兰西胺毒素的生物合成来对抗毒性肠道细菌
Ryan Moreira1, Bidisha Chakraborty2, Yi Yang1
1Department of Chemistry and Howard Hughes Medical Institute, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Nature communications
|July 28, 2025
概括
研究人员开发了针对肠球菌细胞解酶成熟酶CylA的新型抑制剂. 这些化合物有效地阻断毒素活性和基因表达,为与这种细菌毒素相关的疾病提供了潜在的治疗策略.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 毒理学 毒理学 毒理学
背景情况:
- 致病性 *Enterococcus faecalis * 产生肠球菌细胞素素,一种有毒.
- 虽然在肠道中是开始性的,但细胞素素有助于酒精性肝炎的负面结果.
- 向细胞解质激活是一种潜在的治疗途径.
研究的目的:
- 设计和合成必不可少的血清蛋白酶CylA的抑制剂,对于细胞酶激活至关重要.
- 为了研究CylA功能和基质相互作用的结构基础.
- 评估新型抑制剂在阻断细胞酶毒性因子方面的疗效.
主要方法:
- 设计和合成α-aminopeptide玻酸抑制剂.
- 在体外试验测试以确定对CylA的抑制功效.
- 结晶学以阐明CylA的结构.
- 对抑制剂对溶血活性,细胞素水平和基因表达的影响的评估.
主要成果:
- 在低微分子到纳米分子度下,α-aminopeptide 酸可抑制细胞酶的成熟.
- CylA的晶体结构揭示了对酶激活和基质结合的洞察力.
- 抑制剂有效地阻断溶血活性,并降低细胞素素的产生.
- 抑制剂可以减弱细胞酶基因群表达,但不会影响细菌生长.
结论:
- 新型α-氨基酸酸是肠球菌细胞酶成熟的强有力的抑制剂.
- CylA结构为了解毒素激活和抑制剂设计提供了基础.
- 这些抑制剂代表了开发抗细胞素诱导疾病的治疗方法的有希望的策略.
相关概念视频
Biological Methods for Microbial Control
206
Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
206
Antimicrobial Proteins
5.4K
Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
5.4K
Gene Regulation in Microbial Communities: Quorum Sensing
93
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,...
93
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
Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy
549
Helicobacter pylori, a resilient gram-negative bacterium, can thrive in the stomach's harsh, acidic environment. Infection with H. pylori leads to a cascade of events within the stomach lining. One of the critical disruptions caused by this bacterium is the interference with somatostatin production, a hormone responsible for regulating acid secretion. This interference tips the balance, escalating acid secretion and diminishing bicarbonate levels. This imbalance compromises the defensive...
549
Bacterial Flora of the Large Intestine
651
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.
651


