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Thiaminase type II (TenA) catalyzes the deamination of aminopyrimidines, including the cleavage of thiamine to 4-amino-5-hydroxymethyl-2-methyl­pyrimidine and 5-(2-hydroxyethyl)-4-methylthiazole in the metabolism of thiamine (vitamin B1), in Staphylococcus aureus (Sa). SaTenA was crystallized by the vapour-diffusion method and the resulting crystal diffracted to 2.6 Å resolution usng synchrotron radiation. The crystal is orthorhombic, belonging to space group P212121 with unit-cell parameters a = 103.5, b = 104.1, c = 109.6 Å. With four molecules in the asymmetric unit, the Matthews coefficient is 2.85 Å3 Da-1. Initial attempts to solve the structure by molecular-replacement techniques were successful.

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