Ornithine Decarboxylase

**Definition:** A pyridoxal-phosphate protein, believed to be the rate-limiting compound in the biosynthesis of polyamines. It catalyzes the decarboxylation of ornithine to form putrescine, which is then linked to a propylamine moiety of decarboxylated S-adenosylmethionine to form spermidine.

**Tree numbers:** - D08.811.520.224.125.425

**Synonyms:** - Ornithine Carboxy-lyase