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  2. Cyclic glycine-proline - Wikipedia

    en.wikipedia.org/wiki/Cyclic_glycine-proline

    Cyclic glycine-proline (cGP) is a small neuroactive peptide that belongs to a group of bioactive 2,5-diketopiperazines (2,5-DKPs) and is also known as cyclo-glycine-proline. cGP is a neutral, stable naturally occurring compound and is endogenous to the human body; found in human plasma, breast milk and cerebrospinal fluid.

  3. Essential amino acid - Wikipedia

    en.wikipedia.org/wiki/Essential_amino_acid

    Proline and arginine are both derived from glutamate. Serine , formed from 3-phosphoglycerate , which comes from glycolysis , is the precursor of glycine and cysteine . Tyrosine is synthesized by the hydroxylation of phenylalanine , which is an essential amino acid.

  4. Proline - Wikipedia

    en.wikipedia.org/wiki/Proline

    Furthermore, proline is rarely found in α and β structures as it would reduce the stability of such structures, because its side chain α-nitrogen can only form one nitrogen bond. Additionally, proline is the only amino acid that does not form a red-purple colour when developed by spraying with ninhydrin for uses in chromatography. Proline ...

  5. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    Hydroxyproline, generated by hydroxylation of proline, is a major component of the connective tissue collagen. [74] Hypusine in the translation initiation factor EIF5A, contains a modification of lysine. [75] Some non-proteinogenic amino acids are not found in proteins. Examples include 2-aminoisobutyric acid and the neurotransmitter gamma ...

  6. Lysine - Wikipedia

    en.wikipedia.org/wiki/Lysine

    Lysine (symbol Lys or K) [2] is an α-amino acid that is a precursor to many proteins.Lysine contains an α-amino group (which is in the protonated −NH + 3 form when the lysine is dissolved in water at physiological pH), an α-carboxylic acid group (which is in the deprotonated −COO − form when the lysine is dissolved in water at physiological pH), and a side chain (CH 2) 4 NH 2 (which ...

  7. Proteinogenic amino acid - Wikipedia

    en.wikipedia.org/wiki/Proteinogenic_amino_acid

    Similar to lysine, but it has a pyrroline ring attached. Proline: P Pro Pro contains an unusual ring to the N-end amine group, which forces the CO-NH amide sequence into a fixed conformation. It can disrupt protein folding structures like α helix or β sheet, forcing the desired kink in the protein chain.

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