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  2. Enzyme - Wikipedia

    en.wikipedia.org/wiki/Enzyme

    In 1926, James B. Sumner showed that the enzyme urease was a pure protein and crystallized it; he did likewise for the enzyme catalase in 1937. The conclusion that pure proteins can be enzymes was definitively demonstrated by John Howard Northrop and Wendell Meredith Stanley, who worked on the digestive enzymes pepsin (1930), trypsin and ...

  3. Protein - Wikipedia

    en.wikipedia.org/wiki/Protein

    Enzymes carry out most of the reactions involved in metabolism, as well as manipulating DNA in processes such as DNA replication, DNA repair, and transcription. Some enzymes act on other proteins to add or remove chemical groups in a process known as posttranslational modification. About 4,000 reactions are known to be catalysed by enzymes. [53]

  4. Proteolysis - Wikipedia

    en.wikipedia.org/wiki/Proteolysis

    Different proteins are degraded at different rates. Abnormal proteins are quickly degraded, whereas the rate of degradation of normal proteins may vary widely depending on their functions. Enzymes at important metabolic control points may be degraded much faster than those enzymes whose activity is largely constant under all physiological ...

  5. Protease - Wikipedia

    en.wikipedia.org/wiki/Protease

    A protease (also called a peptidase, proteinase, or proteolytic enzyme) [1] is an enzyme that catalyzes proteolysis, breaking down proteins into smaller polypeptides or single amino acids, and spurring the formation of new protein products. [2] They do this by cleaving the peptide bonds within proteins by hydrolysis, a reaction where water ...

  6. Protein metabolism - Wikipedia

    en.wikipedia.org/wiki/Protein_metabolism

    Absorbed amino acids are typically used to create functional proteins, but may also be used to create energy. [3] They can also be converted into glucose. [4] This glucose can then be converted to triglycerides and stored in fat cells. [5] Proteins can be broken down by enzymes known as peptidases or can break down as a result of denaturation ...

  7. Protein structure - Wikipedia

    en.wikipedia.org/wiki/Protein_structure

    Protein structure is the three-dimensional arrangement of ... and enzyme catalysis. [13] Protein dynamics and conformational changes allow proteins to function as ...

  8. Protein biosynthesis - Wikipedia

    en.wikipedia.org/wiki/Protein_biosynthesis

    Protein biosynthesis (or protein synthesis) is a core biological process, occurring inside cells, balancing the loss of cellular proteins (via degradation or export) through the production of new proteins. Proteins perform a number of critical functions as enzymes, structural proteins or hormones.

  9. Dephosphorylation - Wikipedia

    en.wikipedia.org/wiki/Dephosphorylation

    The dephosphorylation of proteins is a mechanism for modifying behavior of a protein, often by activating or inactivating an enzyme. Components of the protein synthesis apparatus also undergo phosphorylation and dephosphorylation and thus regulate the rates of protein synthesis. [10]

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