Pterin deaminase
Introduction

In [enzymology](/wiki/Enzymology "Enzymology"), a **pterin deaminase** () is an [enzyme](/wiki/Enzyme "Enzyme") that [catalyzes](/wiki/Catalysis "Catalysis") the [chemical reaction](/wiki/Chemical_reaction "Chemical reaction")

2\-amino\-4\-hydroxypteridine \+ H2O \\rightleftharpoons 2,4\-dihydroxypteridine \+ NH3
Thus, the two [substrates](/wiki/Substrate_%28biochemistry%29 "Substrate (biochemistry)") of this enzyme are [2\-amino\-4\-hydroxypteridine](/wiki/2-amino-4-hydroxypteridine "2-amino-4-hydroxypteridine") and [H2O](/wiki/Water "Water"), whereas its two [products](/wiki/Product_%28chemistry%29 "Product (chemistry)") are [2,4\-dihydroxypteridine](/wiki/2%2C4-dihydroxypteridine "2,4-dihydroxypteridine") and [NH3](/wiki/Ammonia "Ammonia").

This enzyme belongs to the family of [hydrolases](/wiki/Hydrolase "Hydrolase"), those acting on carbon\-nitrogen bonds other than peptide bonds, specifically in cyclic amidines. The [systematic name](/wiki/List_of_enzymes "List of enzymes") of this enzyme class is **2\-amino\-4\-hydroxypteridine aminohydrolase**. This enzyme is also called **acrasinase**.


What are the substrates of this enzyme?