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Pathways of Pyrimidine Salvage in Streptomyces

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Abstract

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 (upp) and cytidine deaminase (cdd). The conversion of substrates in the pathway was followed using reverse-phase HPLC. The strains deficient in salvage enzymes were also verified by this method. In addition, feeding of exogenous pyrimidines to strains lacking the biosynthetic pathway confirmed the salvage pathway. Data from the analogue, HPLC, and feeding experiments showed that Streptomyces recycles the pyrimidine base uracil, as well as the nucleosides uridine and cytidine. Cytosine is not recycled due to a lack of cytosine deaminase.

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Acknowledgments

This work was funded in part by a UNT Faculty Research Grant to G.A.O’D. The authors thank Professor D.A. Hopwood for providing the S. coelicolor 200 and 210 strains.

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Authors and Affiliations

  1. Department of Biological Sciences, University of North Texas, P.O. 305220, Denton, TX, 76203, USA

    Lee E. Hughes, Debrah A. Beck & Gerard A. O’Donovan

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  1. Lee E. Hughes
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  2. Debrah A. Beck
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  3. Gerard A. O’Donovan
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Correspondence to Lee E. Hughes.

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Hughes, L.E., Beck, D.A. & O’Donovan, G.A. Pathways of Pyrimidine Salvage in Streptomyces. Curr Microbiol 50, 8–10 (2005). https://doi.org/10.1007/s00284-004-4386-4

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  • DOI: https://doi.org/10.1007/s00284-004-4386-4

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