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- W4017593 abstract "The intracellular distribution and localization of dihydrofolate reductase-thymidylate synthase of wild type suspension carrot cells was analysed using cytochemical and immunocytochemical techniques; in both resting and growing normal cells (E4) the activity appeared to be predominantly cytoplasmic. The pattern of localization of the enzyme was also analysed during the different phases of the cell cycle. To this end carrot cells were synchronized with aphidicolin (an inhibitor of the alpha-like DNA polymerase which blocks cells at the G1/S boundary) and cycle phases checked by labelled-thymidine incorporation. Protoplasts obtained from cells inhibited with aphidicolin or from cells sampled at different times after the removal of the drug (S and G2 phase), failed to show a nuclear localization of DHFR-TS. These results indicate that in carrot the bifunctional enzyme does not change compartment during the cell cycle. Surprisingly Mtx-resistant cells (E2A2, E2A1C6; overproducing DHFR-TS) showed, irrespective of their physiological state (quiescent or growing), also a relevant nuclear or perinuclear immunofluorescence which could not be detected using cytochemical techniques. The reason of this altered localization is not clear and its possible relation with altered cytophysiological parameters is discussed." @default.
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- W4017593 date "1991-01-01" @default.
- W4017593 modified "2023-10-14" @default.
- W4017593 title "Cellular localization of dihydrofolate reductase-thymidylate synthase in carrot cells." @default.
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