Uptake of uridine by a long-day duckweed, Lemna gibba G3
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概要
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Uptake of uridine by a long-day duckweed, Lemna gibba G3 was examined. Km and Vmax for uptake were in the range of 1 to 2 × 10^<-5> M and of 5 to 10 × 10^<-8> moles/g fresh weight/2 hr, respectively. Uptake rate depended on temperature, and the optimum pH was 5.0. Uridine uptake was competitively inhibited by some compounds structurally analogous to uridine. However, the activity of uridine kinase was not affected by these compounds, except for cytidine. Uridine uptake was inhibited by metabolic inhibitors, in which uridine taken up was left unconverted to other forms, especially in the presence of DNP. These results suggest that uridine was taken up into the duckweed cells by a specific transport system and immediately phosphorylated by uridine kinase. Phosphorylation of uridine was not associated with the uribine transport reaction.
- 日本植物生理学会の論文
著者
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Nakashima Hideaki
Biological Institute Nagoya University
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Tsudzuki Takahiko
School Of Dentistry Aichi-gakuin University
関連論文
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- CHANGE IN SENSITIVITY TO DARK BREAK AND ITS RELATION TO FLORAL INDUCTION IN LONG-DAY DUCKWEED, LEMNA GIBBA G3
- THE RHYTHMICAL CHANGE IN SENSITIVITY OF A LONG-DAY DUCKWEED, LEMNA GIBBA G3, TO DARK-BREAK
- Effect of light on the metabolism of thymidine in the long-day duckweed, Lemna gibba G3
- Effects of incubation of nuclei from a long-day duckweed, Lemna gibba G3, under different ionic conditions on the activity of RNA synthesis
- Diurnal rhythm of nuclear RNA polymerase I activity in a duckweed, Lemna gibba G3, under continuous light conditions
- Effect of inhibitors of nucleic acid and protein synthesis on the reappearance of "light interruption rhythm" in a long-day duckweed, Lemna gibba G3
- Uptake of uridine by a long-day duckweed, Lemna gibba G3
- Diurnal rhythm of uridine incorporation into RNA regulated by two light-perceiving systems in a long-day duckweed, Lemna gibba G3
- FURTHER STUDIES ON THE ACTION OF FREE AMINO ACIDS ON FLOWERING OF DUCKWEED, LEMNA GIBBA G3
- Reversal of the dark inhibition of flowering in a long-day duckweed, Lemna gibba G3, by thymidine and related nucleosides
- Diurnal change of light-dependent uridine incorporation into RNA in a long-day duckweed, Lemna gibba G3
- On the rhythm of sensitivity to light interruption in a long-day duckweed, Lemna gibba G3
- Further studies on the diurnal rhythm of uridine incorporation into RNA in the long-day duckweed, Lemna gibba G3