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