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Tetrahydroxypteridine cycloisomerase

From Wikipedia, the free encyclopedia

tetrahydroxypteridine cycloisomerase
EC no.
CAS no.37318-54-0
IntEnzIntEnz view
ExPASyNiceZyme view
MetaCycmetabolic pathway
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO

In enzymology, a tetrahydroxypteridine cycloisomerase (EC is an enzyme that catalyzes the chemical reaction

tetrahydroxypteridine xanthine-8-carboxylate

Hence, this enzyme has one substrate, tetrahydroxypteridine, and one product, xanthine-8-carboxylate.

This enzyme belongs to the family of isomerases, specifically the class of intramolecular lyases. The systematic name of this enzyme class is tetrahydroxypteridine lyase (isomerizing). It employs one cofactor, NAD+.


  • Mcnutt WS, Damle SP (December 1964). "Tetraoxypteridine isomerase". The Journal of Biological Chemistry. 239: 4272–9. PMID 14247682.

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Tetrahydroxypteridine cycloisomerase
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