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  2. Hydroxyproline - Wikipedia

    en.wikipedia.org/wiki/Hydroxyproline

    Hydroxyproline and proline play key roles for collagen stability. [4] They permit the sharp twisting of the collagen helix. [ 5 ] In the canonical collagen Xaa-Yaa-Gly triad (where Xaa and Yaa are any amino acid), a proline occupying the Yaa position is hydroxylated to give a Xaa-Hyp-Gly sequence.

  3. Secondary amino acid - Wikipedia

    en.wikipedia.org/wiki/Secondary_amino_acid

    In protein, hydroxyproline is incorporated into protein by hydroxylation of proline. Pipecolic acid, a heavier analog of proline, is found in efrapeptin. Sarcosine is a N-methylized glycine so its methyl group is used in many biochemical reactions. Azetidine-2-carboxylic acid, which is a smaller homolog of proline in plants.

  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. Collagen helix - Wikipedia

    en.wikipedia.org/wiki/Collagen_helix

    Glycine, proline, and hydroxyproline must be in their designated positions with the correct configuration. For example, hydroxyproline in the Y position increases the thermal stability of the triple helix, but not when it is located in the X position. [4] The thermal stabilization is also hindered when the hydroxyl group has the wrong ...

  6. Non-proteinogenic amino acids - Wikipedia

    en.wikipedia.org/wiki/Non-proteinogenic_amino_acids

    Lysine. Technically, any organic compound with an amine (–NH 2) and a carboxylic acid (–COOH) functional group is an amino acid. The proteinogenic amino acids are a small subset of this group that possess a central carbon atom (α- or 2-) bearing an amino group, a carboxyl group, a side chain and an α-hydrogen levo conformation, with the exception of glycine, which is achiral, and proline ...

  7. The #1 Reason Cat Parents Should Be Concerned If Their ... - AOL

    www.aol.com/1-reason-cat-parents-concerned...

    As a general rule of thumb, look for a litter box that is 1.5 times the length of your cat, measured from nose to the base of the tail, suggests board-certified veterinary behaviorist Dr ...

  8. Proteinogenic amino acid - Wikipedia

    en.wikipedia.org/wiki/Proteinogenic_amino_acid

    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. Common in collagen, it often undergoes a post-translational modification to hydroxyproline ...

  9. Here's Why American Cheese Can't Legally Be Called Cheese - AOL

    www.aol.com/lifestyle/heres-why-american-cheese...

    A fixture at any fast food restaurant or backyard barbecue is American cheese. These orange, plastic-wrapped slices are unparalleled in terms of meltability. For many, when it comes to making a ...