向用吉拉性Au NPs向三氨酸脱氨酶:一种用于抑制大肠杆菌的新策略
He Wang1, Haidu Yuan1, Jianhao Zhang2
1College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China.
Biochemical and biophysical research communications
|November 1, 2024
概括
黄金纳米颗粒通过抑制三氨酸脱氨酶 (TD) 和分支链氨基酸 (BCAA) 合成,对大肠杆菌表现出抗菌作用. 补充BCAA可以降低纳米粒子抗菌活性,揭示了一个关键机制.
科学领域:
- 纳米技术 纳米技术
- 微生物学 微生物学
- 生物化学 生化学
背景情况:
- 抗生素耐药性和生物膜感染构成了全球健康威胁.
- 黄金纳米颗粒 (Au NPs) 对大肠杆菌具有抗菌作用.
- 对于Au NP抗菌作用的确切机制需要进一步研究.
研究的目的:
- 为了研究性黄金纳米粒子 (D/L-氨酸功能化D/P-AuNP或L/P-AuNP) 与大肠杆菌中氨酸脱氨酶 (TD) 之间的相互作用.
- 阐明合性Au NPs对TD酶活性及其在细菌生长抑制中的作用.
- 探索合性Au NPs对分支链氨基酸 (BCAA) 生物合成途径的影响.
主要方法:
- 酶活性测定测量通过合性Au NPs来测量TD抑制.
- 分析Au NPs和TD之间的相互作用的光谱技术.
- 蛋白质组学分析以确定与BCAA合成相关的基因表达的变化.
- 有或没有外源BCAA补充的抗菌分析.
主要成果:
- 石化Au NPs通过疏水力与TD结合,形成一个复合物,改变TD的二次结构并降低其活性.
- 合性Au NPs对大肠杆菌的抗菌疗效取决于度.
- 外源补充异黄素和氨酸显著降低了L/P-AuNP的抗菌活性.
- L/P-Au NP治疗导致ilvA和ilvB基因的下调,这对BCAA合成至关重要.
结论:
- 石化Au NPs通过抑制TD酶活性,对大肠杆菌产生抗菌作用.
- 破坏BCAA生物合成是对合性Au NPs的抗菌机制的重要贡献者.
- 了解这种机制可能会导致新的策略来对抗细菌感染.
相关概念视频
01:18Indirect-Acting Cholinergic Agonists: Mechanism of Action
2.8K
Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
2.8K
01:25Inhibitors of Bacterial Protein Synthesis
106
Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
106