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 4-amino-5-hydroxymethyl-2-methylpyrimidine + ammonia (2) thiamine + H2O 4-amino-5-hydroxymethyl-2-methylpyrimidine + 5-(2-hydroxyethyl)-4-methylthiazole
This enzyme was previously known as thiaminase II.
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