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Pyrimidine salvage pathways are vital for all bacteria in that they share in the synthesis of RNA with the biosynthetic pathway in pyrimidine prototrophs, while supplying all pyrimidine requirements in pyrimidine auxotrophs. Salvage enzymes that constitute the pyrimidine salvage pathways were studied in 13 members of Pseudomonas and former pseudomonads. Because it has been established that all Pseudomonas...
Using 5-fluoropyrimidine analogues, high-performance liquid chromatography (HPLC), and the feeding of pyrimidine compounds to pyrimidine auxotrophs, the pathways for salvage of exogenous pyrimidine nucleosides and bases in Streptomyces were established. Selection for resistance to the analogues resulted in the isolation of strains of S. griseus lacking the following enzyme activities: uracil phosphoribosyltransferase...
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