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"catalyzes the formation of PRPP from ribose-5-phosphate and ATP, producing AMP"
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"irreversible diphosphoryl transfer from ATP to ribose-5-phosphate"
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"PRPP is a central "activated ribose" donor"
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"supplies ribose-phosphate to multiple biosynthetic pathways"
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"PRPP is broadly required for"
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"Purine and pyrimidine nucleotide biosynthesis"
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"NAD and NADP"
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"histidine and tryptophan"
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"class I enzymes require divalent cations, including"
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"phosphate (Pi)-activated"
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"AMP, ADP, and GDP"
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"soluble cytosolic enzyme"
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"filamentous assemblies (cytoophidia)"
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"resistant to allosteric inhibition"
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"essential for free-living organisms"
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"ribose-phosphate pyrophosphokinase family"