Amino Acids: Difference between revisions
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Many unusual amino acids are formed by enzyme-catalyzed reactions that modify a standard amino acid after it has been included in a polypeptide; these are called post-translational modifications. Among them: | Many unusual amino acids are formed by enzyme-catalyzed reactions that modify a standard amino acid after it has been included in a polypeptide; these are called post-translational modifications. Among them: | ||
* phosphorylation of serine, threonine, or tyrosine | * phosphorylation of serine, threonine, or tyrosine | ||
** Example: C kinase [[1bkx]] | |||
* hydroxylation of proline (to yield hydroxyproline, e.g. in [[collagen]]) | * hydroxylation of proline (to yield hydroxyproline, e.g. in [[collagen]]) | ||
* acetylation of lysine or the N terminus | * acetylation of lysine or the N terminus | ||
** Example of N-terminal acetylation: [[4mdh]] | |||
* methylation of lysine | * methylation of lysine | ||
* carboxylation of aspartate or glutamate | * carboxylation of aspartate or glutamate | ||