Substance P, Free Acid

Substance P, Free Acid is a synthetic research peptide in the Substance P/tachykinin family. The listed sequence/design is Arg-Pro-Lys-Pro-Gln-Gln-Phe-Phe-Gly-Leu-Met. Substance P is a tachykinin neuropeptide whose best-characterized receptor interaction is with the neurokinin-1 (NK1) receptor. Sequence variants and fragments are useful for NK1 binding and tachykinin structure-activity studies.

• receptor or binding assays
• competition experiments
• enzymatic-processing studies
• antibody or antigen controls
• analytical method development
• LC-MS/HPLC reference work
• comparative structure-activity experiments

Because this product may be a fragment, substituted analog, stereochemical variant, or terminally modified form, its activity should not be assumed to be identical to the native parent peptide. Peptide solubility, aggregation, adsorption to surfaces, and stability can vary with sequence, concentration, pH, ionic strength, and terminal modifications, so assay-specific reconstitution and storage conditions should be validated experimentally.

1. Chimeric NK1 (substance P)/NK3 receptors and tachykinin agonist specificity (PMID 7681831).
2. NK1 receptor mediates migration-promoting effect of substance P (PMID 8740139).