Polymyxin E1 (Sulfate) contains a lipopeptide framework rich in cationic residues that promote membrane-binding investigations. Its cyclic-linear structural combination supports analysis of conformational rigidity. Researchers examine charge-driven interactions with lipid assemblies. Applications include microbial-peptide modeling, structural biophysics, and sequence-activity studies.
CAT No: R2703
CAS No:207990-63-4
Synonyms/Alias:Polymyxin E1 (sulfate);207990-63-4;
Polymyxin E1 (sulfate) is a cationic cyclic lipopeptide antibiotic derived from Bacillus polymyxa, known for its potent interaction with bacterial membranes. As a member of the polymyxin family, it exhibits strong affinity for the lipid A component of lipopolysaccharides, making it particularly effective against Gram-negative bacteria. Its unique amphipathic structure and membrane-disrupting capabilities have established its importance in microbiological, biochemical, and cell biology research. Due to its defined mechanism of action and specificity, Polymyxin E1 (sulfate) serves as a valuable tool for probing bacterial membrane integrity and studying antimicrobial resistance mechanisms.
Antimicrobial mechanism studies: Researchers frequently utilize Polymyxin E1 (sulfate) to elucidate the molecular basis of bacterial membrane permeabilization and cell death. Its ability to bind to and disrupt the outer membrane of Gram-negative organisms provides a model system for dissecting the interactions between cationic peptides and phospholipid bilayers. Such studies contribute to a deeper understanding of antimicrobial peptide function and inform the rational design of novel membrane-targeting agents.
Antibiotic resistance research: The compound is widely employed in investigations into bacterial resistance mechanisms, particularly those involving modifications of lipopolysaccharides or efflux pump expression. By exposing bacterial cultures to defined concentrations of this lipopeptide, scientists can select for resistant mutants, analyze genetic adaptations, and characterize the biochemical pathways that confer decreased susceptibility. These insights are critical for tracking the evolution of resistance and for developing strategies to circumvent it.
Microbial selective pressure assays: In laboratory settings, Polymyxin E1 (sulfate) is used to impose selective pressure on microbial populations, enabling the isolation of specific phenotypes or genotypes. This application is instrumental in the study of population dynamics, horizontal gene transfer, and the emergence of resistance determinants within complex microbial communities. The compound's defined activity spectrum allows for precise manipulation of microbial consortia in experimental models.
Membrane permeability and integrity assays: The lipopeptide's potent membrane-disrupting properties make it an essential reagent in assays designed to assess bacterial envelope integrity. Researchers exploit its action to induce controlled permeabilization, facilitating the uptake of dyes, probes, or other analytical agents into bacterial cells. Such assays are fundamental for screening membrane-targeting compounds, evaluating cell envelope modifications, and validating the efficacy of novel antimicrobials.
Endotoxin neutralization studies: Polymyxin E1 (sulfate) is also employed in in vitro experiments focused on the neutralization of lipopolysaccharide (LPS) endotoxins. Its high-affinity binding to the lipid A moiety enables it to sequester and inactivate LPS molecules, thereby reducing their biological activity. This property is leveraged in biochemical assays, protein purification workflows, and studies of host-pathogen interactions where endotoxin contamination may confound experimental outcomes.
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