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De novo synthesis of pyrimidine nucleotides by Helicobacter pylori.
- Source :
-
The Journal of applied bacteriology [J Appl Bacteriol] 1994 Jul; Vol. 77 (1), pp. 1-8. - Publication Year :
- 1994
-
Abstract
- 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.
- Subjects :
- Aspartate Carbamoyltransferase analysis
Aspartic Acid metabolism
Bicarbonates metabolism
Deoxycytidine Kinase analysis
Helicobacter pylori enzymology
Isotope Labeling
Ligases analysis
Magnetic Resonance Spectroscopy
Orotate Phosphoribosyltransferase analysis
Pentosyltransferases analysis
Phosphorus Isotopes
Carbon-Nitrogen Ligases
Helicobacter pylori metabolism
Pyrimidine Nucleotides biosynthesis
Subjects
Details
- Language :
- English
- ISSN :
- 0021-8847
- Volume :
- 77
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The Journal of applied bacteriology
- Publication Type :
- Academic Journal
- Accession number :
- 7928775
- Full Text :
- https://doi.org/10.1111/j.1365-2672.1994.tb03036.x