ribose phosphate diphosphokinase activity phosphoribosyl diphosphate synthetase activity PPRibP synthetase activity 5-phosphoribosyl-1-pyrophosphate synthetase activity ribose-phosphate pyrophosphokinase activity PRPP synthetase activity phosphoribosyl pyrophosphate synthetase activity PP-ribose P synthetase activity ribose-phosphate diphosphokinase activity ATP:D-ribose-5-phosphate diphosphotransferase activity 5-phosphoribose pyrophosphorylase activity pyrophosphoribosylphosphate synthetase activity ribose-5-phosphate pyrophosphokinase activity Catalysis of the reaction: D-ribose 5-phosphate + ATP = 5-phospho-alpha-D-ribose 1-diphosphate + AMP + 2 H(+). phosphoribosylpyrophosphate synthetase activity ribophosphate pyrophosphokinase activity phosphoribosyl-diphosphate synthetase activity 5-phosphoribosyl-alpha-1-pyrophosphate synthetase activity phosphoribosylpyrophosphate synthase activity diphosphotransferase activity