Oxaloacetic acid is the precursor for the synthesis of amino acid
Lysine (C6H14N2O2, mol weight: 146) is an essential α-amino acid that is not synthesized by the human body. The amino acid belonging to the amino acid family is called the oxaloacetate/ aspartate family. The oxaloacetate/aspartate family also contains amino acids such as asparagine, methionine, isoleucine, and threonine.
As Lysine is an essential amino acid, it is not synthesized by humans and synthesized by organisms such as bacteria, fungi, and higher plants. In higher plants, the amino acid lysine is synthesized using oxaloacetic acid (an intermediate of Kreb’s cycle) as the precursor molecule.