Xanthine dehydrogenase explained

xanthine dehydrogenase
Ec Number:1.17.1.4
Cas Number:9054-84-6
Go Code:0004854
Width:320

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

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.

Xanthine dehydrogenase catalyzes the following chemical reaction:

xanthine + NAD+ + H2O

\rightleftharpoons

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

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

Defects in xanthine dehydrogenase cause xanthinuria, may contribute to adult respiratory stress syndrome, and may potentiate influenza infection through an oxygen metabolite-dependent mechanism. It has been shown that patients with lung adenocarcinoma tumors which have high levels of XDH gene expression have lower survivals.[3] [4] Addiction to XDH protein has been used to target NSCLC tumors and cell lines in a precision oncology manner.[4]

See also

References

Further reading

Notes and References

  1. Web site: Entrez Gene: XDH xanthine dehydrogenase. October 25, 2012 .
  2. Ichida K, Amaya Y, Noda K, Minoshima S, Hosoya T, Sakai O, Shimizu N, Nishino T . 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 . November 1993 . 8224915 . 10.1016/0378-1119(93)90652-J .
  3. Konno H, Minamiya Y, Saito H, Imai K, Kawaharada Y, Motoyama S, Ogawa J . Acquired xanthine dehydrogenase expression shortens survival in patients with resected adenocarcinoma of lung . Tumour Biology . 33 . 5 . 1727–32 . October 2012 . 22678977 . 10.1007/s13277-012-0431-2 . 13495397 .
  4. Tavassoly I, Hu Y, Zhao S, Mariottini C, Boran A, Chen Y, Li L, Tolentino RE, Jayaraman G, Goldfarb J, Gallo J, Iyengar R . Genomic signatures defining responsiveness to allopurinol and combination therapy for lung cancer identified by systems therapeutics analyses . Molecular Oncology . May 2019 . 31116490 . 10.1002/1878-0261.12521 . 13 . 8 . 1725–1743 . 6670022.