2. What are Aromatic amino acid?
An aromatic amino acid (AAA) is an amino acid that includes an aromatic ring.
Among the 20 standard amino acids, the following are aromatic: phenylalanine, tryptophan and tyrosine.
However, in addition to being aromatic, tyrosine can be classified as a polar amino acid.
3. Chemical and Physical properties
Aromatic amino acid absorbs the ultraviolet light at
the wavelength above 250nm and produce
fluorescence.
Phenylalanine has relatively weak absorbance in
comparison to other standard aromatic amino acid,
its presence can only be detected if tryptophan and
tyrosine are not present.
Aromatic Amino Acid are relatively non-polar.
Tyrosine is one of the aromatic amino acid with an
ionizable side chain.
4. Biosynthesis of aromatic compound
In plants, the shikimate pathway first leads to the
formation of chorismate, which is the precursor of
phenylalanine, tyrosine, and tryptophan.
These aromatic amino acids are the derivatives of
many secondary metabolites, all essential to a plant's
biological functions.
5. Biosynthesis of Chorismate
Chorismate is the common
metabolic precursor to
produce aromatic amino
acids and their derivatives.
and can be further
converted into tyrosol
via chorismate metabolism.
