Health Dictionary Find a Doctor

Xanthine dehydrogenase

Xanthine dehydrogenase, also known as XDH, is a protein that, in humans, is encoded by the XDH gene.[1][2]

Function

Function

Xanthine dehydrogenase belongs to the group of molybdenum-containing hydroxylases involved in the oxidative metabolism of purines. The enzyme is a homodimer. Xanthine dehydrogenase can be converted to xanthine oxidase by reversible sulfhydryl oxidation or by irreversible proteolytic modification.[1]

Xanthine dehydrogenase catalyzes the following chemical reaction:

File:Xanthine dehydrogenase.svg
xanthine + NAD+ + H2O <math>\rightleftharpoons</math> urate + NADH + H+

The three substrates of this enzyme are xanthine, NAD+, and H2O, whereas its three products are urate, NADH, and H+.

This enzyme participates in purine metabolism.

Nomenclature

Nomenclature

This enzyme belongs to the family of oxidoreductases, to be specific, those acting on CH or CH2 groups with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is xanthine:NAD+ oxidoreductase. Other names in common use include NAD+-xanthine dehydrogenase, xanthine-NAD+ oxidoreductase, xanthine/NAD+ oxidoreductase, and xanthine oxidoreductase.

Clinical significance

Clinical significance

Defects in xanthine dehydrogenase cause xanthinuria, may contribute to adult respiratory stress syndrome, and may potentiate influenza infection through an oxygen metabolite-dependent mechanism.[1]

See also

See also

References

References

  1. 1.0 1.1 1.2 “Entrez Gene: XDH xanthine dehydrogenase”. Retrieved October 25, 2012.
  2. Ichida K, Amaya Y, Noda K, Minoshima S, Hosoya T, Sakai O, Shimizu N, Nishino T (Nov 1993). “Cloning of the cDNA encoding human xanthine dehydrogenase (oxidase): structural analysis of the protein and chromosomal location of the gene”. Gene. 133 (2): 279–84. doi:10.1016/0378-1119(93)90652-J. PMID 8224915.
Further reading

Further reading

Looking for the patient version?

Back to the patient-friendly article

© 2026 MyEClinic – IFTM Institut für Telematik in der Medizin GmbH