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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 + H<sub>2</sub>O 4-amino-5-hydroxymethyl-2-methylpyrimidine + ammonia
(2) thiamine + H<sub>2</sub>O 4-amino-5-hydroxymethyl-2-methylpyrimidine + 5-(2-hydroxyethyl)-4-methylthiazole

This enzyme was previously known as thiaminase II.

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