Mutation in the phosphoribosylpyrophosphate synthetase gene (prs) that results in simultaneous requirements for purine and pyrimidine nucleosides, nicotinamide nucleotide, histidine, and tryptophan in Escherichia coli

Bjarne Hove-Jensen

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    Abstract

    A mutant of Escherichia coli harboring a temperature-labile phosphoribosylpyrophosphate (PRPP) synthetase was characterized. Despite the lack of a detectable PRPP pool or PRPP synthetase activity at 40 degrees C, the strain was fully viable at this temperature as long as guanosine, uridine, histidine, tryptophan, and nicotinamide mononucleotide were all added to the growth medium. Viability of the strain was dependent upon mutations in genes of the nucleoside salvage pathways that improved the utilization of exogenous nucleosides. The properties of the strain are those expected of a PRPP-less strain and suggest that PRPP synthetase is dispensable for E. coli.
    OriginalsprogEngelsk
    TidsskriftJournal of Bacteriology
    Vol/bind170
    Udgave nummer3
    Sider (fra-til)1148-1152
    ISSN0021-9193
    DOI
    StatusUdgivet - 1988

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