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• W1552474620 abstract "Data are presented which indicate that the repression of pur gene expression seen after the addition of preformed purines to cultures of Salmonella typhimurium is the consequence of the presence or the formation of the purine bases, hypoxanthine and guanine. This conclusion is based on the following observations. First, it was impossible to find a correlation between the size of any individual purine nucleotide pool and the level of the first four enzymes in the de novo biosynthetic pathway. Second, adenine plus guanosine served as a perfect source of purine nucleotides, but their presence caused no repression of pur gene expression if the cells lacked purine nucleoside phosphorylase activity. This enzyme is needed to convert adenine and guanosine to hypoxanthine and guanine, but not for their conversion to nucleotides. Third, addition of guanine to a strain lacking guanine phosphoribosyltransferase (gpt) resulted in a repression of the level of the purine de novo biosynthetic enzymes, a reduction of the growth rate, and a fall in the pools of ATP and GTP. Addition of hypoxanthine to a strain lacking hypoxanthine phosphoribosyltransferase (hpt) had a similar, although weaker, effect. If the cells lacked both hypoxanthine and guanine phosphoribosyltransferases (hpt gpt), their basal level of the purine de novo biosynthetic enzymes was repressed in minimal medium. Such cells grow slower than wild-type cells and excrete purines, probably due to the inability to salvage endogenously formed hypoxanthine and guanine." @default.
• W1552474620 created "2016-06-24" @default.
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• W1552474620 date "1983-02-01" @default.
• W1552474620 modified "2023-10-12" @default.
• W1552474620 title "Role of hypoxanthine and guanine in regulation of Salmonella typhimurium pur gene expression" @default.
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• W1552474620 doi "https://doi.org/10.1128/jb.153.2.837-845.1983" @default.
• W1552474620 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/221703" @default.
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