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  2. Peptide - Wikipedia

    en.wikipedia.org/wiki/Peptide

    Drosomycin, an example of a peptide. Peptides are short chains of amino acids linked by peptide bonds. [1] [2] A polypeptide is a longer, continuous, unbranched peptide chain. [3] Polypeptides that have a molecular mass of 10,000 Da or more are called proteins. [4]

  3. What are peptides? Why some people take them and what ... - AOL

    www.aol.com/peptides-understand-why-people-them...

    Peptides are amino acids − the body's building blocks of protein. Understand why athletes use them to get a leg up. ... But for decades, many top athletes have turned to enhancements so natural ...

  4. Ribosomally synthesized and post-translationally modified ...

    en.wikipedia.org/wiki/Ribosomally_synthesized...

    Ribosomally synthesized and post-translationally modified peptides (RiPPs), also known as ribosomal natural products, are a diverse class of natural products of ribosomal origin. [1] Consisting of more than 20 sub-classes, RiPPs are produced by a variety of organisms , including prokaryotes , eukaryotes , and archaea , and they possess a wide ...

  5. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    However, not all peptide bonds are formed in this way. In a few cases, peptides are synthesized by specific enzymes. For example, the tripeptide glutathione is an essential part of the defenses of cells against oxidative stress. This peptide is synthesized in two steps from free amino acids. [128]

  6. Protein (nutrient) - Wikipedia

    en.wikipedia.org/wiki/Protein_(nutrient)

    As a fuel, proteins provide as much energy density as carbohydrates: 17 kJ (4 kcal) per gram; in contrast, lipids provide 37 kJ (9 kcal) per gram. The most important aspect and defining characteristic of protein from a nutritional standpoint is its amino acid composition. [2] Proteins are polymer chains made of amino acids linked together by ...

  7. 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 ...

  8. Light harvesting materials - Wikipedia

    en.wikipedia.org/wiki/Light_harvesting_materials

    Natural light harvesting complexes contain proteins that combine through self-assembly with effective donor chromophores in order to promote light harvesting and energy transfer during photosynthesis; synthetic peptides can be designed to have optoelectronic properties that mimic this phenomenon in natural light harvesting complexes. [19]

  9. Protein metabolism - Wikipedia

    en.wikipedia.org/wiki/Protein_metabolism

    A peptide bond forms between the amino acid attached to the tRNA in the P site and the amino acid attached to a tRNA in the A site. The formation of a peptide bond requires an input of energy. The two reacting molecules are the alpha amino group of one amino acid and the alpha carboxyl group of the other amino acids.