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- W2023472138 abstract "Soluble cytoplasmic and membrane fractions were prepared from three cultured mammalian cell lines: 3T3 mouse fibroblasts, V79 hamster lung cells, and human “Cherry” B-lymphoblastoid cells. By using relatively specific nucleotidase assays, together with a phosphotransferase assay, the activities of three different enzymes (low-Km nucleotidase, high-Km nucleotidase, and 5′(3′)-nucleotidase) capable of dephosphorylating deoxyribonucleoside 5′-monophosphates were determined in these fractions. The three nucleotidases exist simultaneously in all cell lines, but their relative amounts showed large variations. The 5′(3′) -nucleotidase dominated Cherry and 3T3 cells, while in V79 cells equal amounts of this enzyme and the high-Km nucleotidase were recovered. In the membrane fractions, the low-Km nucleotidase was the predominant enzyme. We found no evidence for cell-cycle control of any nucleotidase. We postulated earlier that substrate cycles, involving 5′-nucleotidases and deoxyribonucleoside kinases, provide a mechanism for the regulation of deoxyribonucleotide pools. We suggest that both the low-Km nucleotidase and the 5′(3)-nucleotidase are candidate enzymes for such cycles." @default.
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- W2023472138 date "1990-10-01" @default.
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- W2023472138 title "Nucleotidase activities in soluble and membrane fractions of three different mammalian cell lines" @default.
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- W2023472138 doi "https://doi.org/10.1016/0014-4827(90)90186-e" @default.
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