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- W1996342010 abstract "The [3H]XTPs are used widely to monitor RNA synthesis in vitro. Recently, we discovered that they reflected only 40-45% of the true rate of nuclear RNA synthesis. Thus, when [8-14C]GTP was used, 1466 pmol [8-14C]GMP was incorporated per mg DNA/10 min. On the other hand, when [8-3H]GTP was used, only 564 pmol [8-3H]GMP was incorporated per mg DNA/10 min. There are three obvious factors that could have contributed to this greater than 2-fold difference in the apparent incorporation rate: commercial [8-3H]GTP sample was contaminated with substances causing the assay medium to be less efficient in RNA synthesis; 3H exchange occurred during acid washing of the [3H]RNA; and there was a greater quenching effect on [3H]RNA. Experiments were designed to test each of these alternatives. We are able to conclude that none of the above three are contributing factors. Our data also show that the 3H label was removed after it was incorporated into RNA. Similar differences were observed when 3H and 14C labeled pairs of ATP, UTP and CTP were compared. Furthermore, when nuclei were fractionated into nucleolar and nucleoplasmic fractions and carried out RNA synthesis, the loss of 3H label was observed mainly from the nucleoplasmic fraction." @default.
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- W1996342010 date "1986-12-01" @default.
- W1996342010 modified "2023-10-02" @default.
- W1996342010 title "Errors from using 3H-labeled ribonucleoside triphosphates to monitor nuclear RNA synthesis in vitro" @default.
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- W1996342010 doi "https://doi.org/10.1016/0165-022x(86)90040-0" @default.
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