A tripeptide is a
peptide Peptides (from Greek language πεπτός, ''peptós'' "digested"; derived from πέσσειν, ''péssein'' "to digest") are short chains of amino acids linked by peptide bonds. Chains of fewer than ten or fifteen amino acids are called oligopep ...
derived from three
amino acid Amino acids are organic compound , CH4; is among the simplest organic compounds. In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen chemical bond, bonds. Due to carbon's ability to Catenation, c ...

amino acid
s joined by two or sometimes three
peptide bond In organic chemistry, a peptide bond is an amide type of Covalent bond, covalent chemical bond linking two consecutive alpha-amino acids from C1 (carbon number one) of one alpha-amino acid and N2 (nitrogen number two) of another, along a peptide o ...

peptide bond
s. As for proteins, the function of peptides is determined by the constituent amino acids and their sequence. The simplest tripeptide is glycylglycylglycine. In terms of scientific investigations, the dominant tripeptide is
glutathione Glutathione (GSH) is an antioxidant in plants, animals, fungi, and some bacteria and archaea. Glutathione is capable of preventing damage to important Cell (biology), cellular components caused by reactive oxygen species such as free radicals, pe ...

(γ-L-Glutamyl-L-cysteinylglycine), which serves many roles in many forms of life.


* Eisenin (pGlu-Gln-Ala-OH) is a peptide with immunological activity that is isolated from the Japanese marine alga, ''Eisenia bicyclis'', which more commonly is known as Arame *Copper peptide GHK-Cu, GHK-Cu (glycyl-L-histidyl-L-lysine) is a human copper binding peptide with wound healing and skin remodeling activity, which is used in anti-aging cosmetics and more commonly referred to as Copper peptide GHK-Cu, copper peptide *Lactotripeptides (Ile-Pro-Pro and Val-Pro-Pro) found in milk products, act as ACE inhibitors *Leupeptin (''N''-acetyl-L-leucyl-L-leucyl-L-argininal) is a Protease inhibitor (biology), protease inhibitor that also acts as an inhibitor of calpain *Melanostatin (prolyl-leucyl-glycinamide) is a peptide hormone produced in the hypothalamus that inhibits the release of melanocyte-stimulating hormone (MSH) *Ophthalmic acid (L-''γ''-glutamyl-L-''α''-aminobutyryl-glycine) is an analogue of glutathione isolated from lens (anatomy), crystalline lens *Norophthalmic acid (''y''-glutamyl-alanyl-glycine) is an analogue of glutathione (L-cysteine replaced by L-alanine) isolated from crystalline lens *Thyrotropin-releasing hormone (TRH, thyroliberin or protirelin) (L-pyroglutamyl-L-histidinyl-L-prolinamide) is a peptide hormone that stimulates the release of thyroid-stimulating hormone and prolactin by the anterior pituitary *ACV (δ-(L-α-aminoadipyl)-L-Cys-D-Val) is a key biosyntheses, biosynthetic precursor to penicillin and cephalosporin.

See also

*Dipeptide *Tetrapeptide


Peptides {{Protein-stub