4a-hydroxytetrahydrobiopterin dehydratase

The enzyme 4a-hydroxytetrahydrobiopterin dehydratase catalyzes the chemical reaction


 * 4a-hydroxytetrahydrobiopterin $$\rightleftharpoons$$ 6,7-dihydrobiopterin + H2O

This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is 4a-hydroxytetrahydrobiopterin hydro-lyase (6,7-dihydrobiopterin-forming). Other names in common use include 4a-hydroxy-tetrahydropterin dehydratase, pterin-4α-carbinolamine dehydratase, and 4a-hydroxytetrahydrobiopterin hydro-lyase.

Structural studies
As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes, , and.