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Dihydropyrimidinase (EC 3.5.2.2) catalyzes the second step in the reductive pathway of pyrimidine degradation, the hydrolysis of 5,6-dihydrouracil and 5,6-dihydrothymine to the corresponding N-carbamylated beta-amino acids. Crystals of the recombinant enzyme from the yeast Saccharomyces kluyveri diffracting to 2.6 A at a synchrotron-radiation source have been obtained by the hanging-drop vapour-diffusion method. They belong to space group P2(1) (unit-cell parameters a = 91.0, b = 73.0, c = 161.4 A, beta = 91.4 degrees), with one homotetramer per asymmetric unit.
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Dobritzsch et al. (2005) studied this question.
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