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- W2078777637 abstract "Abstract In plants, as well as the generally distributed phosphate-dependent phosphoribosylpyrophosphate (PRPP) synthetase (class I), phosphate-independent PRPP synthetase (class II) is also present. To investigate the effect of the inorganic phosphate (Pi) level on the two classes of PRPP synthetase, we first estimated the cellular phosphate level using 33Pi in suspension-cultured Arabidopsis thaliana cells. 33Pi in the culture medium was taken up by the cells, and the concentration of Pi in cells increased up to 5.5 μmol/g fresh weight within 24 h once the cells were transferred to the fresh medium; its concentration then fell because of the conversion of Pi to organic compounds. In vitro activity of PRPP synthetase increased after inoculation and maintained a high activity until the early exponential growth stage. The transcript levels of PRS1 and PRS2 encoding class I and PRS3 encoding class II enzymes increased rapidly after the cells were transferred to the fresh medium, then remained almost constant during the early exponential growth phase. In contrast, constitutive expression of PRS4 encoding cytosolic class II enzyme was observed during culture. During long-term Pi-starvation the transcript levels of PRS1 and PRS2 were reduced, but PRS3 and PRS4 were expressed continually during the Pi-starvation. Pi-dependent PRPP synthetase activity was simultaneously reduced, but Pi-independent activity did not change. Expression of PRS1 and PRS2 and the activity of Pi-dependent enzyme grew to normal rates by 24 h after supply of Pi." @default.
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- W2078777637 date "2009-08-01" @default.
- W2078777637 modified "2023-09-25" @default.
- W2078777637 title "Phosphate levels and expression of phosphoribosylpyrophosphate synthetase isozymes in suspension-cultured Arabidopsis thaliana cells" @default.
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- W2078777637 doi "https://doi.org/10.1016/j.phytol.2009.03.004" @default.
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