| The biosynthesis of aromatic amino acids phenylalanine, tyrosine, and tryptophan, takes multiple and complicated biochemical rections,most of them dealt with the formation of the ring structure. |  |
| The biosynthesis of aromatic amino acids phenylalanine, tyrosine, and tryptophan, takes multiple and complicated biochemical rections,most of them dealt with the formation of the ring structure. | |
| Chorismate is the coommon intermediate for these 3 aromatic amino acids and is derived from erythrose-4-phosphate and phosphoenolpyruvate. |
| Complex amino acid biosynthetic pathways have been very useful and informative in studies on genetics and gene expression. |
| Biosynthesis of amino acid is feed-back regulated. |
| The enzyme that controls one of the early step is inhibited by the final product amino acid (excess tryptophan reduces the activity of anthranilate synthase). |
Additional modes of regulation that fit different
types of biosynthetic pathways.
 |
 |
 |
 |