. "Catalysis of the reaction: D-ribulose 5-phosphate + ATP = D-ribulose 1,5-bisphosphate + ADP + 2 H(+)." . . . "PRK" . "PKK" . "phosphoribulokinase activity" . "5-phosphoribulose kinase activity" . "ATP:D-ribulose-5-phosphate 1-phosphotransferase activity" . "phosphopentokinase activity" . "phosphoribulokinase (phosphorylating)" . "PRuK" . "ribulose phosphate kinase activity" . "ribulose-5-phosphate kinase activity" . . .