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6-Pyruvoyl tetrahydropterin synthase (PTPS) is an enzyme involved in tetrahydrobiopterin biosynthesis, the cofactor for several aromatic aminoacid monooxygenases and the nitric oxide synthases. The crystal structure of PTPS was recently solved and showed a homohexameric enzyme composed of a dimer of trimers. A transition metal binding site formed by the three histidine residues 23, 48 and 50 was found...
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