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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 May;80(9):2564–2568. doi: 10.1073/pnas.80.9.2564

Pyrimidine metabolism in Tritrichomonas foetus.

C C Wang, R Verham, S F Tzeng, S Aldritt, H W Cheng
PMCID: PMC393866  PMID: 6573672

Abstract

The anaerobic parasitic protozoa Tritrichomonas foetus is found incapable of de novo pyrimidine biosynthesis by its failure to incorporate bicarbonate, aspartate, or orotate into pyrimidine nucleotides or nucleic acids. Uracil phosphoribosyltransferase in the cytoplasm provides the major pyrimidine salvage for the parasite. Exogenous uridine and cytidine are mostly converted to uracil by uridine phosphorylase and cytidine deaminase in T. foetus prior to incorporation. T. foetus cannot incorporate labels from exogenous uracil or uridine into DNA; it has no detectable dihydrofolate reductase or thymidylate synthetase and is resistant to methotrexate, pyrimethamine, trimethoprim, and 5-bromovinyldeoxyuridine at millimolar concentrations. It has an enzyme thymidine phosphotransferase in cellular fraction pelleting at 100,000 X g that can convert exogenous thymidine to TMP via a phosphate donor such as p-nitrophenyl phosphate or nucleoside 5'-monophosphate. Thymidine salvage in T. foetus is thus totally dissociated from other pyrimidine salvage.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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