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- W1574385690 abstract "Phosphorylation of histone fractions in the presence and absence of DNA synthesis was measured using the new “isoleucine-limiting” method for synchronizing Chinese hamster cells in early G1-phase. Using preparative electrophoresis, histone f1 phosphorylation was found to be dependent upon cell-cycle position, being absent in G1-arrested and G1-traversing cells and active in the S-phase. The absence of f1 phosphorylation in G1-arrested cells, which are known to exhibit f1 turnover, indicates that f1 phosphorylation is not an obligatory part of the f1 turnover process. In contrast to histone f1, it was found that histone f2a2 phosphorylation is independent of cell-cycle position, occurring with equal magnitude in the G1-traversing state when DNA synthesis is essentially absent and in the S-phase when DNA synthesis is active. When cells were arrested in the G1-state by isoleucine deprivation, f2a2 phosphorylation continued to be active, occurring at 56% of the rate observed in the G1-traversing state. These results indicate that phosphorylation of histone f2a2 is independent of f2a2 synthesis, independent of DNA synthesis, and independent of histone f1 phosphorylation. Because f2a2 is actively phosphorylated in G1-arrested cells known to be active in the synthesis of various types of RNA (including messenger) as well as in G1-traversing and S-phase cells, we feel that phosphorylation of histone f2a2 should continue to be considered in models concerning activation of DNA template activity." @default.
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- W1574385690 title "The metabolism of histone fractions" @default.
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- W1574385690 doi "https://doi.org/10.1016/0003-9861(73)90051-9" @default.
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