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- W1575843979 abstract "A new fast assay procedure for increasing deoxyuridine triphosphate nucleotidohydrolase activity was developed. With this assay procedure, this enzyme derived from blast cells of patients with acute lymphocytic leukemia was purified at least 1218-fold. The molecular weight was estimated by gel filtration to be 43,000. The enzyme exhibited optimal activity over a pH range of 7 to 8 and the activation energy was estimated to be 6.5 kcal/mol at pH 7.5. While the enzyme had activity in the absence of added divalent cations, the activity could be inhibited by EDTA but not by phenanthroline. The inhibition caused by EDTA could be reversed by Mg2+ or Zn2+. The enzyme had maximal activity in the presence of Mg2+ (40 muM) and Mg2+ (4 mM) stabilized the enzyme at 37 degrees C. Cupric ion (0.5 mM) inhibited (50%) enzyme activity in the presence or absence of Mg2+. The substrate for the enzyme was dUTP and the apparent Km was 1 muM. No other deoxyribonucleoside or ribonucleoside triphosphate served as a substrate for the enzyme." @default.
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- W1575843979 date "1979-04-01" @default.
- W1575843979 modified "2023-09-27" @default.
- W1575843979 title "Human deoxyuridine triphosphate nucleotidohydrolase. Purification and characterization of the deoxyuridine triphosphate nucleotidohydrolase from acute lymphocytic leukemia." @default.
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- W1575843979 doi "https://doi.org/10.1016/s0021-9258(17)30158-8" @default.
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