Threonine

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** An essential amino acid in humans (provided by food), Threonine is an important residue of many proteins, such as tooth enamel, collagen, and elastin. An important amino acid for the nervous system, threonine also plays an important role in porphyrin and fat metabolism and prevents fat buildup in the liver. Useful with intestinal disorders and indigestion, threonine has also been used to alleviate anxiety and mild depression. (NCI04)

**Synonyms:** - (2S,3R)-2-Amino-3-hydroxybutanoic acid - THREONINE - Thr