High Quality Content by WIKIPEDIA articles! Peptide 3' is a 12-amino acid linear peptide corresponding to amino acids 51 to 62 of mature human chemokine CCL2. It is formed from L-amino acids with the sequence NH2-Glu-Ile-Cys-Ala-Asp-Pro-Lys-Gln-Lys-Trp-Val-Gln-OH (or in single letter code NH2-EICADPKQKWVQ-OH). 'Peptide 3' was found to be a Broad-Spectrum Chemokine Inhibitor inhibiting chemotaxis of human myelomonocytic cell line THP-1 monocytes and human neutrophils induced by a range of chemokines including CCL2, CCL3, CXCL8 and CXCL12 with roughly equal potency of 10 M, but not migration induced by other non-chemokine chemoattractants such as n-formyl-Met-Leu-Phe (fMLP) or TGF- . Biotinylated 'Peptide 3' was found to bind to THP-1 cells with a disassociation constant of roughly 10 M. This suggested that 'Peptide 3' functions as a chemokine receptor antagonist. This mechanism was later proved to not be in action.

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