Title : HeLa cell DNA polymerases: the effect of cycloheximide in vivo and detection of a new form of DNA polymerase alpha.

Pub. Date : 1977 Jul 5

PMID : 884108






6 Functional Relationships(s)
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1 Blockage of protein synthesis in HeLa cells by cycloheximide leads to selective effects on the levels of DNA polymerases alpha, beta, and gamma in the cell. Cycloheximide DNA polymerase alpha 1, catalytic subunit Homo sapiens
2 The total activity of DNA polymerase alpha remains unchanged after 7 h exposure of cells to cycloheximide but drops to 50% of its original level after 24 h. The level of the beta-polymerase falls rapidly in the cell and is reduced to less than 30% of its initial value by 7 h after treatment of the cells with cycloheximide. Cycloheximide DNA polymerase alpha 1, catalytic subunit Homo sapiens
3 The total activity of DNA polymerase alpha remains unchanged after 7 h exposure of cells to cycloheximide but drops to 50% of its original level after 24 h. The level of the beta-polymerase falls rapidly in the cell and is reduced to less than 30% of its initial value by 7 h after treatment of the cells with cycloheximide. Cycloheximide DNA polymerase alpha 1, catalytic subunit Homo sapiens
4 The cycloheximide-treated cells also show the presence of a new form of the alpha-polymerase, designated alpha1, which can be clearly detected as a separate entity in column chromatography. Cycloheximide adrenoceptor alpha 1D Homo sapiens
5 The level of alpha1 in the nucleus increases during the period that the cells are treated and cycloheximide so that after 24 h it represents almost 50% of the nuclear DNA polymerase activity. Cycloheximide adrenoceptor alpha 1D Homo sapiens
6 The presence of alpha1 in the cytoplasmic fraction can also be demonstrated in both cycloheximide-treated and normal, growing cells. Cycloheximide adrenoceptor alpha 1D Homo sapiens