Posttranslational modification of proteins

  • Some proteins contain amino acids other than the standard 20. These modified amino acids
  • include hydroxyproline, methylhistidine, and phosphoserine. However, each of these amino acids
  • is clearly derived from one of the standard 20 amino acids. These amino acids are made by
  • posttranslational modification of the protein after it has been released from the ribosome; you
  • will learn more about posttranslational modification of proteins