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• W2165835219 abstract "Methotrexate (MTX), a strong inhibitor of dihydrofolate reductase (DHFR), has been widely used for chemotherapy for many types of cancer as well as for juvenile rheumatoid arthritis. It mimics folate substrates and binds tightly to the active site of DHFR, perhaps in a conformation close to the transition state of the folate catalyzed reaction. Absorption, fluorescence and ultrasensitive Raman difference spectroscopies show that light-activated MTX reacts with NADPH in the enzyme active site, producing 5,8-dihydromethotrexate (5,8-dihydro-MTX) and NADP+. The reaction, which proceeds with a hydride transfer between C4 (pro-R side) of the nicotinamide ring and N5 of the pteridine ring, is similar to that between folate and NADPH except that the hydride is transferred to C6 in this case. Hence, MTX is catalytically competent in its excited state. Most experiments were performed on the Escherichia coli enzyme, but preliminary studies show that the reaction also occurs with human DHFR." @default.
• W2165835219 created "2016-06-24" @default.
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• W2165835219 date "1999-01-01" @default.
• W2165835219 modified "2023-09-25" @default.
• W2165835219 title "Light Activates Reduction of Methotrexate by NADPH in the Ternary Complex with Escherichia coli Dihydrofolate Reductase" @default.
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• W2165835219 doi "https://doi.org/10.1111/j.1751-1097.1999.tb05309.x" @default.
• W2165835219 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10063803" @default.
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