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Identification of a novel human uridine phosphorylase.

Biochem. Biophys. Res. Commun.2003 Jul 18;307(1):41-6
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摘要


Uridine phosphorylase catalyzes the reversible phosphorylytic cleavage of uridine and deoxyuridine to uracil and ribose- or deoxyribose-1-phosphate. The enzyme has an important role in the metabolism of pyrimidine analogs used in cancer chemotherapy. The cDNA of a novel 317 amino acid human uridine phosphorylase approximately 60% identical to the previously identified human uridine phosphorylase was cloned. The novel enzyme, named uridine phosphorylase-2 (UPase-2), showed broad substrate specificity and accepted uridine, deoxyuridine, and thymidine as well as the two pyrimidine nucleoside analogs 5-fluorouridine and 5-fluoro-2(')-deoxyuridine. The human UPase-2 gene was mapped to chromosome 2q24.1 and the 2.2-kb mRNA was predominantly expressed in kidney. The mouse UPase-2 cDNA was also identified and shown to be predominantly expressed in liver. The identification of a novel uridine phosphorylase with broad substrate specificity is important for studies on both nucleoside metabolism as well as for studies on the pharmacological mechanisms of therapeutic pyrimidine nucleoside analogs.

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