Scientific Background | Exendin 4 is a synthetic research peptide in the exendin / GLP-1 receptor ligand family. Exendin-4 is a peptide agonist of the GLP-1 receptor, whereas the N-terminally truncated exendin(9-39) peptide is a well-established GLP-1 receptor antagonist. Functional expression studies directly demonstrated this agonist/antagonist relationship, and receptor-binding studies showed that exendin peptides interact strongly with the extracellular ligand-binding domain of GLP-1R. Exendin fragments and modified analogs are therefore widely used as mechanistic GLP-1 receptor probes. |
Experimental Notes | For fragments, substituted analogs, labeled peptides, stereochemical variants, or terminally modified forms, experimental behavior should be evaluated for the exact construct rather than assumed to match the native parent peptide. Sequence-dependent solubility, aggregation, adsorption, oxidation, and stability should be considered when establishing reconstitution, storage, and assay conditions. |
