Catalytic Mechanism of the Cyclohydrolase Activity of Human Aminoimidazole Carboxamide Ribonucleotide Formyltransferase/Inosine Monophosphate Cyclohydrolase

The bifunctional enzyme aminoimidazole carboxamide ribonucleotide transformylase/inosine monophosphate cyclohydrolase (ATIC) is responsible for catalysis of the last two steps in the de novo purine pathway. Using recently determined crystal structures of ATIC as a guide, four candidate residues, Lys...

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