De novo synthesis of pyrimidine nucleotides by Helicobacter pylori
| Autor: | Stuart L. Hazell, Barbara M. Jiménez, William J. O'Sullivan, G.L. Mendz, Annette M. Gero |
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| Rok vydání: | 1994 |
| Předmět: |
Magnetic Resonance Spectroscopy
Orotate Phosphoribosyltransferase Applied Microbiology and Biotechnology Microbiology Ligases chemistry.chemical_compound Deoxycytidine Kinase Aspartate Carbamoyltransferase Carbon-Nitrogen Ligases Nucleotide Pentosyltransferases CTP synthetase Nucleotide salvage chemistry.chemical_classification Aspartic Acid Uracil phosphoribosyltransferase Helicobacter pylori biology Phosphorus Isotopes Uracil De novo synthesis Bicarbonates chemistry Biochemistry Isotope Labeling Pyrimidine metabolism biology.protein Orotate phosphoribosyltransferase Pyrimidine Nucleotides |
| Zdroj: | Journal of Applied Bacteriology. 77:1-8 |
| ISSN: | 0021-8847 |
| DOI: | 10.1111/j.1365-2672.1994.tb03036.x |
| Popis: | The incorporation of pyrimidine nucleotide precursors into Helicobacter pylori and the activities of enzymes involved in their synthetic pathways were investigated by radioactive tracer analysis and 31P nuclear magnetic resonance spectroscopy. The bacterium was found to take up aspartate and bicarbonate and to incorporate carbon atoms from these precursors into its genomic DNA. Orotate, an intermediate of de novo pyrimidine biosynthesis, and uracil and uridine, precursors for pyrimidine pathways, were also incorporated by the micro-organism. Radiolabelled substrates were used to assess the activities of aspartate transcarbamoylase, orotate phosphoribosyltransferase, orotidylate decarboxylase, CTP synthetase, uracil phosphoribosyltransferase, thymidine kinase and deoxycytidine kinase in bacterial lysates. The study provided evidence for the presence in H. pylori of an operational de novo pathway, and a less active salvage pathway for the biosynthesis of pyrimidine nucleotides. |
| Databáze: | OpenAIRE |
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