Sepiapterin deaminase

In enzymology, a sepiapterin deaminase is an enzyme that catalyzes the chemical reaction


 * sepiapterin + H2O $$\rightleftharpoons$$ xanthopterin-B2 + NH3

Thus, the two substrates of this enzyme are sepiapterin and H2O whereas its two products are xanthopterin-B2 and NH3.

This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amidines. The systematic name of this enzyme class is sepiapterin aminohydrolase.