Dynorphin A (1-10) an endogenous opioid neuropeptide, binds to extracellular loop 2 of the κ-opioid receptor. Dynorphin A (1-10) also blocks NMDA-activated current with an IC50 of 42.0 μM.
Dynorphin A 1-10 is a synthetic peptide fragment derived from the endogenous opioid peptide dynorphin A, consisting of the first ten amino acids of the parent sequence. As a member of the opioid peptide family, it is notable for its selective affinity and partial agonist activity at kappa-opioid receptors, with additional interactions at other opioid receptor subtypes. The truncated structure of Dynorphin A 1-10 preserves key functional domains necessary for receptor engagement, making it a valuable molecular tool in neurochemical, pharmacological, and receptor signaling studies. Its defined sequence and bioactive conformation provide a focused platform for dissecting the structure-activity relationships that govern opioid peptide function within the central nervous system and peripheral tissues.
Receptor pharmacology: Dynorphin A 1-10 is widely employed in receptor binding and signaling assays to elucidate the specificity, affinity, and efficacy of peptide ligands at kappa-opioid receptors. By using this fragment in radioligand displacement or functional G protein-coupled receptor (GPCR) assays, researchers can characterize the molecular determinants of receptor-ligand interactions and map the functional domains responsible for agonist versus antagonist behavior. Its use supports the optimization of novel kappa-opioid ligands and enhances understanding of opioid receptor subtype selectivity.
Neuropeptide signaling studies: The peptide serves as an essential probe in neuropeptide signaling research, enabling detailed investigations into the physiological and biochemical roles of dynorphin-derived sequences. Application of Dynorphin A 1-10 in neuronal cell cultures, tissue preparations, or ex vivo systems allows scientists to analyze synaptic transmission, neuromodulation, and intracellular signaling cascades mediated by endogenous opioid peptides. This facilitates the exploration of neural circuits involved in pain processing, stress response, and behavior modulation.
Peptide structure-activity relationship (SAR) analysis: Dynorphin A 1-10 is frequently used in SAR studies to delineate the minimal structural features required for high-affinity receptor binding and biological activity. By comparing the activity profiles of this truncated fragment with those of full-length dynorphin A and other analogs, researchers can identify critical sequence motifs and post-translational modifications that influence peptide stability, receptor selectivity, and functional potency. Such insights inform the rational design of next-generation peptide therapeutics and research probes.
Analytical method development: The defined sequence and physicochemical properties of Dynorphin A 1-10 make it a suitable standard for developing and validating analytical techniques such as high-performance liquid chromatography (HPLC), mass spectrometry, and immunoassays targeting opioid peptides. Employing this peptide as a reference compound supports the quantification and detection of dynorphin-related peptides in complex biological samples, facilitating biomarker discovery and neurochemical profiling in research contexts.
Peptide synthesis and modification research: The fragment is also utilized as a model substrate in the development and optimization of solid-phase peptide synthesis protocols and post-synthetic modifications. Its moderate length and sequence complexity allow for the evaluation of coupling efficiencies, protecting group strategies, and purification methods relevant to opioid peptides. This application aids in advancing synthetic methodologies and expanding the repertoire of bioactive peptide analogs available for experimental and therapeutic exploration.
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