Polymyxin B3 represents a lipopeptide-derived structure rich in cationic residues that support membrane-interaction studies. Its cyclic and linear elements create a multifaceted conformational profile. Researchers examine its binding behavior toward lipid assemblies. Applications include antimicrobial-peptide modeling, structural mimicry, and charge-driven interaction research.
CAT No: R2468
CAS No:71140-58-4
Synonyms/Alias:DPMB3;UNII-L194HGU2LD;L194HGU2LD;71140-58-4;N-[(2S)-4-amino-1-[[(2S,3R)-1-[[(2S)-4-amino-1-oxo-1-[[(3S,6S,9S,12S,15R,18S,21S)-6,9,18-tris(2-aminoethyl)-15-benzyl-3-[(1R)-1-hydroxyethyl]-12-(2-methylpropyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptazacyclotricos-21-yl]amino]butan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-1-oxobutan-2-yl]octanamide;CHEMBL1088939;SCHEMBL21474115;
Polymyxin B3 is a distinct member of the polymyxin family of cyclic lipopeptide antibiotics, recognized for its potent interaction with the outer membrane of Gram-negative bacteria. Characterized by its amphipathic structure and unique fatty acid side chain, Polymyxin B3 demonstrates strong affinity for lipopolysaccharides, facilitating disruption of bacterial cell membranes. Its chemical properties make it an invaluable tool in scientific research, particularly in studies focusing on bacterial resistance mechanisms, membrane biology, and the development of novel antimicrobial strategies. As a research reagent, it is frequently employed in microbiological, biochemical, and pharmaceutical investigations to probe the functional dynamics of bacterial outer membranes and to assess the efficacy of combination therapies. The versatility and specificity of Polymyxin B3 continue to drive its integration into a wide range of experimental protocols, supporting advancements in both fundamental and applied microbiological sciences.
Antimicrobial Susceptibility Testing: Polymyxin B3 is widely utilized in antimicrobial susceptibility assays to evaluate the resistance profiles of Gram-negative bacterial isolates. By incorporating this compound into agar dilution or broth microdilution methods, researchers can accurately determine minimum inhibitory concentrations and monitor emerging resistance trends. This application is critical for guiding the selection of potential therapeutic agents in preclinical studies and for understanding the molecular basis of polymyxin resistance, particularly in multidrug-resistant bacterial strains.
Membrane Permeabilization Studies: As a potent disruptor of bacterial outer membranes, Polymyxin B3 serves as a valuable probe in membrane permeabilization assays. Researchers employ it to investigate the integrity and permeability of bacterial membranes, often using fluorescent dyes or reporter molecules to quantify membrane disruption. These studies yield insights into the mechanisms of action of lipopeptide antibiotics and facilitate the identification of novel compounds or adjuvants that can enhance membrane-targeting antimicrobial activity.
Endotoxin Neutralization Research: The strong binding affinity of Polymyxin B3 for the lipid A component of endotoxins (lipopolysaccharides) underpins its application in endotoxin neutralization studies. By selectively binding and sequestering endotoxins, it enables researchers to explore strategies for reducing endotoxin-mediated inflammatory responses in experimental models. This property is particularly relevant in the context of developing new approaches to mitigate the effects of bacterial endotoxins in various research settings.
Synergistic Antimicrobial Combinations: In the pursuit of overcoming bacterial resistance, Polymyxin B3 is frequently incorporated into studies assessing the synergistic effects of antibiotic combinations. Researchers investigate its interactions with other antimicrobial agents to identify combinations that exhibit enhanced bactericidal activity against resistant pathogens. These findings inform the rational design of combination therapies and contribute to the optimization of antibiotic regimens in experimental models of infection.
Outer Membrane Protein Characterization: The ability of Polymyxin B3 to selectively interact with bacterial membranes makes it a powerful tool for the isolation and characterization of outer membrane proteins. By destabilizing the outer membrane, it facilitates the extraction and subsequent analysis of membrane-associated proteins, enabling detailed studies of their structure, function, and role in bacterial physiology. This application supports research into membrane protein biogenesis, antibiotic resistance mechanisms, and the identification of novel drug targets, further underscoring the importance of Polymyxin B3 in advancing microbiological and biochemical research.
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