相关实验视频

Updated: Jul 17, 2025

Gramicidin-based Fluorescence Assay; for Determining Small Molecules Potential for Modifying Lipid Bilayer Properties

Gramicidin-based Fluorescence Assay; for Determining Small Molecules Potential for Modifying Lipid Bilayer Properties

Published on: October 13, 2010

一种性聚胺抗生素,向格拉姆阴性细菌的膜

Yahua Chen¹, Melvin Yong¹, Ming Li¹

¹Infectious Diseases Translational Research Programme, Department of Biochemistry, National University of Singapore, Singapore, Singapore.

The Journal of antimicrobial chemotherapy

|September 6, 2023

概括

聚胺 (PIM5) 有效地向耐多药格拉姆阴性细菌 (GNB),包括对最后手段抗生素耐药的菌株. 这种新型化合物通过破坏膜和DNA迅速杀死细菌,对人类细胞有最小的毒性.

科学领域:

微生物学微生物学
传染性疾病传染性疾病
药物发现药物发现药物发现

背景情况:

耐多药格拉姆阴性细菌 (GNB) 构成了严重的全球健康威胁,需要开发新型抗菌剂.
聚胺 (PIM) 化合物已显示出抗菌活性和低细胞毒性,但它们的作用机制需要阐明.
在GNB中出现对碳烯和胆素的耐药性突显出迫切需要替代治疗策略.

研究的目的:

调查水友性聚胺化合物PIM5对抗抗素和美罗胺耐药格拉姆阴性细菌的临床分离物的疗效.
阐明PIM5的作用机制,包括它对细菌膜和DNA的影响.
评估对PIM5的抗药性发展潜力及其对人类细胞的细胞毒性.

主要方法:

最低抑制度 (MIC) 和消耗时间的测试是在耐药的大肠杆菌和Klebsiella pneumoniae临床分离物上进行的.
使用N--1-胺和酸染料评估了膜透性.
自发和单 deletion 突变被生成来研究抵抗机制,重点是 BaeS 两组件系统.

主要成果:

PIM5对敏感和耐药的GNB菌株都表现出强烈的活性,包括对胆固醇素和梅罗胺抗性菌株.
该化合物表现出快速的,独立于生长阶段的杀菌作用,特别是在水环境中,通过破坏外部和细胞质细菌膜.
发现PIM5可以结合并入细菌基因组DNA的细胞后进入,而高水平的耐药性并不容易发展. BaeS 中的突变适度地影响了灵敏度和吸收.
在人类细胞中观察到微不足道的细胞毒性,其细菌杀菌度相当于polymyxin B和colistin.

结论:

PIM5是一种高效的宽谱抗生素候选剂,可对抗多药耐药的格拉姆阴性细菌.
它的机制涉及双膜破坏和DNA插曲,为最后的抗生素提供了一个有希望的替代方案.
PIM5具有良好的安全性,哺乳动物细胞毒性较低.

更多相关视频

Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

Published on: July 10, 2016

A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries

A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries

Published on: December 27, 2016

相关概念视频

Pore Transport and Ion-Pair Transport

Pore Transport and Ion-Pair Transport

Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...

Bacterial Cell Wall

Bacterial Cell Wall

The bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...

Surface Membrane Barriers

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...

Antimicrobial Proteins

Antimicrobial Proteins

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...

Detergent Purification of Membrane Proteins

Detergent Purification of Membrane Proteins

Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...

Potentiometry: Membrane Electrodes

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...