Peptide 401, a potent mast cell degranulating factor from bee venom, suppresses the increased vascular permeability due to intradermal injection of various smooth muscle spasmogens (histamine, and 5-HT).
Peptide 401 is a synthetic peptide compound recognized for its defined amino acid sequence and its utility in a variety of biochemical and molecular biology research contexts. As a short-chain peptide, it is frequently employed as a model substrate, functional probe, or structural motif in peptide science, offering researchers a controlled system for investigating peptide-related mechanisms and interactions. Its well-characterized structure and physicochemical properties make it a versatile tool for applications ranging from enzymology studies to receptor binding assays and cell signaling research. The compound's relevance extends to fields such as protein engineering, drug discovery, and advanced analytical method development, where precise peptide reagents are essential for reliable experimental outcomes.
Enzyme substrate studies: In enzymology, Peptide 401 serves as a valuable substrate for the characterization of protease activity and specificity. Researchers utilize this peptide to assess the catalytic efficiency, cleavage patterns, and substrate preferences of various proteolytic enzymes. By monitoring the hydrolysis of the peptide under controlled conditions, investigators can elucidate enzyme kinetics, identify active site requirements, and evaluate the effects of inhibitors or cofactors on enzymatic function. This approach is pivotal for mapping protease-substrate interactions and for advancing the understanding of protein turnover and regulation in biological systems.
Receptor binding assays: The defined sequence of Peptide 401 enables its use in receptor-ligand interaction studies, particularly in the context of peptide hormone or neurotransmitter receptor research. Scientists employ it to probe binding affinities, receptor selectivity, and downstream signaling events in cell-based or cell-free assay systems. By using labeled or modified forms of the peptide, researchers can quantify binding kinetics, map receptor binding sites, and dissect the molecular determinants of specificity. Such studies are instrumental in the identification and validation of novel receptor targets as well as in the screening of potential modulators.
Peptide mapping and analytical method development: Analytical chemists leverage Peptide 401 as a reference standard or calibration peptide in mass spectrometry, HPLC, and related peptide mapping techniques. Its predictable fragmentation patterns and chromatographic behavior facilitate the validation of analytical platforms used for peptide identification, sequence confirmation, and quantitation. Incorporating this peptide into method development workflows enhances assay reproducibility and accuracy, supporting the rigorous characterization of more complex peptide mixtures or biopharmaceutical products.
Cell signaling and functional assays: In cell biology, Peptide 401 is incorporated into functional assays to investigate signal transduction pathways mediated by peptide-responsive receptors or intracellular effectors. By introducing the peptide to cultured cells or tissue preparations, researchers can monitor downstream biochemical responses, such as phosphorylation events, second messenger production, or gene expression changes. These experiments provide mechanistic insights into the role of specific peptide motifs in regulating cellular processes and contribute to the elucidation of signaling networks relevant to physiology and disease.
Protein engineering and structure-activity relationship studies: The modular nature of Peptide 401 makes it an ideal scaffold for site-directed mutagenesis, sequence optimization, or the incorporation of non-natural amino acids. Protein engineers and medicinal chemists use it to systematically alter sequence elements, thereby dissecting the contributions of individual residues to biological activity, stability, or molecular recognition. These structure-activity relationship investigations inform the rational design of improved peptide analogs, peptidomimetics, or bioconjugates for a range of experimental and preclinical research applications.
1. Adipose tissue is a key organ for the beneficial effects of GLP-2 metabolic function
3. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
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