DE-NOVO SYNTHESIS OF PYRIMIDINE NUCLEOTIDES BY HELICOBACTER-PYLORI

被引:27
作者
MENDZ, GL [1 ]
JIMENEZ, BM [1 ]
HAZELL, SL [1 ]
GERO, AM [1 ]
OSULLIVAN, WJ [1 ]
机构
[1] UNIV NEW S WALES,SCH MICROBIOL & IMMUNOL,KENSINGTON,NSW 2033,AUSTRALIA
来源
JOURNAL OF APPLIED BACTERIOLOGY | 1994年 / 77卷 / 01期
关键词
D O I
10.1111/j.1365-2672.1994.tb03036.x
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
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 P-31 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 nova pathway, and a less active salvage pathway for the biosynthesis of pyrimidine nucleotides.
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页码:1 / 8
页数:8
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