Aminopyrimidine aminohydrolase

UniProtKB accession:  A8KRL3

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UniProtKB description:  Catalyzes an amino-pyrimidine hydrolysis reaction at the C5' of the pyrimidine moiety of thiamine compounds to give a hydroxymethylpyrimidine (HMP). Displays low activity on 4-amino-5-aminomethyl-2-methylpyrimidine as substrate, indicating that the enzyme may act on a different HMP precursor that may derive from the human stomach food assumption or processing. Is probably involved in thiamine biosynthesis. Does not display thiaminase II activity, as it is unable to hydrolyze thiamine.