[Nle11]-Substance P is a substance P analog that avoids methionine oxidation problems.
[Nle11]-Substance P is a synthetic peptide analogue of the neuropeptide Substance P, distinguished by the substitution of norleucine (Nle) at the eleventh amino acid position. This structural modification imparts unique biochemical characteristics, enhancing its stability and resistance to enzymatic degradation compared to the native peptide. As a member of the tachykinin peptide family, [Nle11]-Substance P retains the core functionalities associated with Substance P, notably its ability to interact with neurokinin receptors. Its modified structure makes it an invaluable tool for investigating peptide-receptor interactions, signal transduction pathways, and the physiological roles of tachykinins in both central and peripheral systems.
Receptor binding studies: The peptide is widely utilized in receptor pharmacology to examine the specificity, affinity, and functional consequences of ligand binding to neurokinin 1 (NK1) and related tachykinin receptors. Its enhanced metabolic stability allows for more controlled and extended experimental conditions, facilitating detailed characterization of receptor-ligand interactions. Researchers leverage [Nle11]-Substance P to dissect the molecular determinants of receptor activation, desensitization, and downstream signaling, providing insights that are critical for understanding neuropeptide signaling dynamics.
Peptide structure-activity relationship analysis: The norleucine substitution at position 11 in [Nle11]-Substance P offers a strategic advantage for elucidating structure-activity relationships within the tachykinin family. By comparing the biological activities and receptor interactions of this analogue with those of native Substance P and other derivatives, scientists can map the contributions of specific amino acid residues to receptor selectivity, potency, and functional outcomes. Such studies inform the rational design of novel peptide analogues with tailored pharmacological profiles.
Neuropeptide signaling research: In neurobiology and pharmacology, [Nle11]-Substance P is employed to investigate the mechanisms underlying neuropeptide-mediated communication in neuronal and non-neuronal tissues. Its resistance to enzymatic degradation enables sustained activation of signaling pathways, making it particularly suitable for experiments that require prolonged exposure or repeated stimulation. This property is exploited in studies exploring neurotransmitter release, synaptic plasticity, and the modulation of inflammatory responses.
Peptide degradation and stability studies: The modified peptide serves as a model substrate for examining the enzymatic pathways involved in neuropeptide metabolism. By comparing the degradation rates of [Nle11]-Substance P with those of unmodified Substance P, researchers gain valuable information on the specificity and activity of peptidases, including neprilysin and angiotensin-converting enzyme. These investigations contribute to a deeper understanding of peptide turnover and the development of metabolically stable peptide therapeutics for research purposes.
Analytical method development: Owing to its defined structure and enhanced stability, [Nle11]-Substance P is frequently used as a reference standard or internal control in the development and validation of analytical techniques for peptide quantification. Mass spectrometry, high-performance liquid chromatography (HPLC), and related bioanalytical assays benefit from the inclusion of this analogue, which aids in optimizing detection parameters, calibrating instrumentation, and ensuring reproducibility across experimental runs. Its use in these contexts supports the advancement of reliable analytical methodologies in peptide research.
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