A tripeptide is a
peptideconsisting of three amino acidsjoined by peptide bonds.
Examples of tripeptides are:
Glutathione("γ"-glutamyl-cysteinyl-glycine) is an antioxidant, protecting cells from toxins such as free radicals.
Thyrotropin-releasing hormone(TRH, thyroliberin or protirelin) (L-pyroglutamyl-L-histidinyl-L-prolinamide) is a peptide hormonethat stimulates the release of thyroid-stimulating hormoneand prolactinby the anterior pituitary.
*Melanostatin (prolyl-leucyl-glycinamide) is a peptide hormone produced in the
hypothalamusthat inhibits the release of melanocyte-stimulating hormone(MSH).
Ophthalmic acid(L-"γ"-glutamyl-L-"α"-aminobutyryl-glycine) is an analogue of glutathioneisolated from crystalline lens.
*Norophthalmic acid ("y"-glutamyl-alanyl-glycine) is an analogue of glutathione (L-cysteine replaced by L-alanine) isolated from
*Eisenin (pGlu-Gln-Ala-OH) is a peptide with immunological activity isolated from the Japanese marine alga "Eisenia bicyclis".
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