出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/02/25 21:53 UTC 版)
A tetrapeptide is a peptide consisting of four amino acids joined by peptide bonds. Many tetrapeptides are pharmacologically active, often showing affinity and specificity for a variety of receptors in protein-protein signaling. Present in nature are both linear and cyclic tetrapeptides; tetrapeptides may be cyclized by a fourth peptide bond or other covalent bonds.