5-Phospho-D-ribose 1-diphosphate (sodium salt)

5-Phospho-D-ribose 1-diphosphate (sodium salt) (CAS No.: 108321-05-7) is a central endogenous metabolite that functions as a key phosphoribosyl donor in cellular biosynthetic pathways, particularly in the de novo and salvage synthesis of purine and pyrimidine nucleotides. As the sodium salt form of phosphoribosyl pyrophosphate (PRPP), it is generated from ribose-5-phosphate and ATP by PRPP synthetase and serves as an essential substrate for enzymes such as adenine phosphoribosyltransferase and hypoxanthine-guanine phosphoribosyltransferase, thereby supporting AMP and GMP formation. Beyond nucleotide biosynthesis, it also contributes to the production of amino acids including histidine and tryptophan, as well as cofactors such as NAD and NADP, highlighting its integral role in cellular metabolism and redox balance. Experimental studies indicate that modulation of intracellular PRPP levels can influence enzymatic activities and metabolic flux through nucleotide synthesis pathways, making it a valuable tool for investigating metabolic regulation and signaling networks associated with nucleotide homeostasis. In vitro applications typically utilize concentrations in the nanomolar to micromolar range depending on assay design, and it is widely employed in biochemical assays, enzyme activity studies, and metabolic pathway analyses, as well as in cell-based and preclinical models to explore mechanisms underlying nucleotide metabolism and related biological processes.