Aminopyrimidine aminohydrolase

Aminopyrimidine aminohydrolase (, thiaminase, thiaminase II, tenA (gene)) is an enzyme with systematic name 4-amino-5-aminomethyl-2-methylpyrimidine aminohydrolase. This enzyme catalyses the following chemical reaction


 * (1) 4-amino-5-aminomethyl-2-methylpyrimidine + H2O $$\rightleftharpoons$$ 4-amino-5-hydroxymethyl-2-methylpyrimidine + ammonia
 * (2) thiamine + H2O $$\rightleftharpoons$$ 4-amino-5-hydroxymethyl-2-methylpyrimidine + 5-(2-hydroxyethyl)-4-methylthiazole

This enzyme was previously known as thiaminase II.