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- W31415979 abstract "Pyrimidine metabolism in Pseudomonas fluorescens biotype F, and its ability to grow in liquid culture on pyrimidines and related compounds was investigated. It was found that uracil, uridine, cytosine, cytidine, deoxycytidine, dihydrouracil, dihydrothymine, beta-alanine or beta-aminoisobutyric acid could be utilized by this pseudomonad as a sole nitrogen source. Only uridine, cytidine, beta-alanine, beta-aminoisobutyric acid or ribose were capable of supporting its growth as a sole source of carbon. In solid medium, the pyrimidine analogue 5-fluorouracil or 5-fluorouridine could prevent P. fluorescens biotype F growth at a low concentration while a 20-fold higher concentration of 5-fluorocytosine, 5-fluorodeoxyuridine or 6-azauracil was necessary to block its growth. The pyrimidine salvage enzymes cytosine deaminase, nucleoside hydrolase, uridine phosphorylase, thymidine phosphorylase and cytidine deaminase were assayed. Only cytosine deaminase and nucleoside hydrolase activities could be detected under the assay conditions used. The effect of growth conditions on cytosine deaminase and nucleoside hydrolase levels in the micro-organism was explored. Cytosine deaminase activity was shown to increase if glycerol was substituted for glucose as the sole carbon source or if asparagine replaced (NH4)2SO4 as the sole nitrogen source in each respective medium. In contrast, nucleoside hydrolase activity remained virtually unchanged whether the carbon source in the medium was glucose or glycerol. A decrease in nucleoside hydrolase activity was witnessed when asparagine was present in the medium instead of (NH4)2SO4 as the sole source of nitrogen." @default.
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- W31415979 date "1988-01-01" @default.
- W31415979 modified "2023-09-23" @default.
- W31415979 title "Metabolism of pyrimidine bases and nucleosides by Pseudomonas fluorescens biotype F." @default.
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