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In enzymology, a pterin deaminase is an enzyme that catalyzes the chemical reaction
Thus, the two substrates of this enzyme are 2-amino-4-hydroxypteridine and H2O, whereas its two products are 2,4-dihydroxypteridine 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 2-amino-4-hydroxypteridine aminohydrolase. This enzyme is also called acrasinase.
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