The auxanographic analysis of 67 purine-dependent mutants and chromatographic analysis of their culture fluids were used to study purine biosynthesis in Staphylococcus aureus. The de novo biosynthesis of IMP from SAICAR, and the conversion of IMP to AMP and GMP were shown to occur via the conventional pathways reported for other organisms. Mutants blocked prior to the formation of SAICAR could not be differentiated by the tests used, and no substantial information on this portion of the pathway was obtained. The auxanographic characteristics of double mutants requiring both histidine and purines provided evidence that the sole route whereby S. aureus can convert AMP to IMP (and hence to GMP) is via those reactions of the histidine biosynthetic pathway leading to the formation of IGP and AICAR. In addition, we were able to mutationally separate AICAR transformylase and inosinocase; this separation has not been accomplished in other microorganisms.
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Baxter-Gabbard, K.L., Pattee, P.A. Purine biosynthesis in Staphylococcus aureus . Archiv. Mikrobiol. 71, 40–48 (1970). https://doi.org/10.1007/BF00412233
- Staphylococcus Aureus
- Biosynthetic Pathway