Hel 13-5 (Pulmonary Surfactant Model Peptide)

Hel 13-5 trifluoroacetate salt H-Lys-Leu-Leu-Lys-Leu-Leu-Leu-Lys-Leu-Trp-Leu-Lys-Leu-Leu-Lys-Leu-Leu-Leu-OH trifluoroacetate salt is a synthetic peptide compound that has gained significant attention in the field of biochemical research. Characterized by its amphipathic alpha-helical structure, this peptide is composed of a sequence rich in lysine and leucine residues, with a single tryptophan contributing to its unique physicochemical properties. The trifluoroacetate salt form enhances its solubility and stability, making it suitable for a variety of laboratory applications. Researchers value this compound for its ability to interact with biological membranes, which underpins its utility in studies exploring peptide-membrane interactions, antimicrobial mechanisms, and the design of novel bioactive molecules. Its robust structure and defined sequence make it a versatile tool for experimental protocols requiring reproducibility and specificity.

Antimicrobial Mechanism Studies: Hel 13-5 peptide is widely employed in investigations focused on elucidating the mechanisms by which antimicrobial peptides exert their effects on microbial cell membranes. By incorporating this peptide into in vitro assays, researchers can observe its interactions with bacterial lipid bilayers, analyze its membrane-disruptive capabilities, and identify the structural motifs responsible for its selective targeting of microbial cells. These studies contribute to a deeper understanding of peptide-based antimicrobial strategies and inform the development of next-generation bioactive agents.

Membrane Permeabilization Assays: The helical structure and amphipathic nature of Hel 13-5 make it an ideal candidate for use in membrane permeabilization assays. Scientists utilize this peptide to probe the integrity of artificial and natural lipid bilayers, monitoring changes in permeability, ion flux, and membrane potential. Such experiments are critical for dissecting the biophysical principles governing peptide-membrane interactions and for screening the efficacy of membrane-active compounds in a controlled laboratory setting.

Peptide-Membrane Interaction Modeling: In computational and structural biology, Hel 13-5 serves as a model peptide for simulating and visualizing peptide-lipid interactions at the molecular level. Its well-defined sequence allows researchers to employ molecular dynamics simulations, NMR spectroscopy, and circular dichroism to characterize its conformation, binding orientation, and depth of insertion within model membranes. These insights are invaluable for rational peptide design and for advancing our understanding of the structural determinants of membrane activity.

Biofilm Disruption Research: The application of Hel 13-5 in biofilm disruption studies leverages its potential to penetrate and destabilize microbial biofilms, which are often resistant to conventional antimicrobial agents. By integrating this peptide into in vitro biofilm models, researchers can assess its ability to inhibit biofilm formation, facilitate biofilm dispersal, and enhance the susceptibility of embedded microorganisms to other treatments. This line of investigation supports the search for innovative approaches to manage persistent microbial communities in various environments.

Drug Delivery System Development: The amphipathic and membrane-active properties of Hel 13-5 trifluoroacetate salt have inspired its use in the design and optimization of peptide-based drug delivery systems. By incorporating this peptide into liposomal or nanoparticle formulations, scientists can exploit its membrane-interacting capabilities to promote cellular uptake and improve the delivery of therapeutic payloads. These studies contribute to the broader field of targeted drug delivery, offering strategies to enhance bioavailability and therapeutic efficacy in experimental models. Hel 13-5 trifluoroacetate salt thus occupies a pivotal role in advancing peptide science and membrane biology, providing a foundation for innovative research across multiple scientific disciplines.

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3. Crystal Structure of BamB from Pseudomonas aeruginosa and Functional Evaluation of Its Conserved Structural Features

4. Therapeutic potential of an intestinotrophic hormone, glucagon-like peptide 2, for treatment of type 2 short bowel syndrome rats with intestinal bacterial and fungal dysbiosis

5. Uncarboxylated osteocalcin decreases insulin-stimulated glucose uptake without affecting insulin signaling and regulators of mitochondrial biogenesis in myotubes