rasburicase

A recombinant urate oxidase enzyme isolated from a genetically-modified strain of Saccharomyces cerevisae. Urate oxidase catalyzes the oxidation of uric acid to the excretable mebolite allantoin, a molecule that is 5-10 times more water-soluble than uric acid. An enzyme that occurs endogenously in most mammals, urate oxidase is not found in humans.