LL-37 (Human) Biotinylated couples the full-length cathelicidin with a biotin tag for high-affinity immobilization. The peptide retains its amphipathic, α-helical structure, enabling membrane and protein-binding studies. Researchers use streptavidin-based systems to capture complexes and map interaction partners. Applications include antimicrobial-peptide mechanism analysis, pull-down assays, and biosensor development.
CAT No: R2745
LL 37 (human) biotinylated is a chemically modified form of the human cathelicidin antimicrobial peptide LL-37, featuring a biotin tag for enhanced detection and capture in research applications. As a cationic, amphipathic peptide, LL-37 plays a pivotal role in the innate immune response, exhibiting broad-spectrum antimicrobial activity and modulating various host defense mechanisms. The addition of a biotin moiety allows for facile conjugation to streptavidin-based probes and surfaces, greatly expanding the utility of this peptide in biochemical assays. LL-37's significance extends to studies of host-pathogen interactions, immunomodulation, and cell signaling, making the biotinylated version a valuable tool for advanced experimental designs. Its unique combination of biological activity and chemical accessibility positions it as a key reagent for researchers investigating innate immunity, peptide-receptor interactions, and protein-protein binding events.
Antimicrobial mechanism studies: Biotinylated LL-37 is widely employed in elucidating the mechanisms underlying antimicrobial peptide action against bacteria, fungi, and viruses. By facilitating the precise tracking and localization of the peptide within microbial cultures or infected cell systems, the biotin tag enables researchers to monitor binding, membrane disruption, and internalization events using streptavidin-conjugated detection systems. This approach provides critical insights into the spatial and temporal dynamics of peptide-microbe interactions, supporting the development of new antimicrobial strategies and a deeper understanding of innate host defense.
Protein-protein interaction assays: The biotinylated derivative is particularly advantageous in pull-down assays and affinity purification protocols designed to identify LL-37 binding partners. Immobilization of the peptide on streptavidin-coated matrices allows for efficient capture of interacting proteins from cell lysates or biological fluids. Subsequent analysis of these complexes by mass spectrometry or immunoblotting can reveal previously uncharacterized receptors, co-factors, or regulatory molecules involved in LL-37-mediated signaling pathways, thereby advancing knowledge of its immunomodulatory roles.
Cellular uptake and trafficking studies: Researchers utilize biotinylated LL-37 to investigate peptide uptake, intracellular distribution, and trafficking in mammalian cells. The biotin tag enables sensitive visualization through fluorescence microscopy or flow cytometry when paired with labeled streptavidin, allowing for real-time monitoring of peptide localization and dynamics. These studies are crucial for dissecting the mechanisms of cellular entry, endosomal escape, and the intracellular targets of LL-37, shedding light on its multifaceted biological functions.
Receptor binding analysis: The biotinylated form is also instrumental in quantitative binding assays aimed at characterizing the interactions between LL-37 and cellular receptors. By immobilizing the peptide on biosensor surfaces or microplates, researchers can perform high-throughput screening and kinetic analyses using surface plasmon resonance, ELISA, or similar platforms. Such studies help define the affinity, specificity, and functional consequences of LL-37 engagement with cell surface targets, informing both basic research and potential translational applications.
Immunological pathway exploration: The availability of biotinylated LL-37 supports detailed investigations into the modulation of immune cell function, including chemotaxis, cytokine production, and inflammatory signaling. Its traceability enables precise quantification and localization in complex biological systems, facilitating studies on how LL-37 influences leukocyte recruitment, dendritic cell activation, or epithelial defense mechanisms. These applications contribute to the broader understanding of innate immunity and peptide-mediated regulation of host responses under physiological and pathophysiological conditions.
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