Ribose 1,5-bisphosphokinase Ribose 1,5-bisphosphate phosphokinase PhnN 185 PHNN_ECOLI b4094 Catalyzes the phosphorylation of ribose 1,5-bisphosphate to 5-phospho-D-ribosyl alpha-1-diphosphate (PRPP). It acceptes ATP but not GTP as a phosphoryl donor, and it uses ribose 1,5- bisphosphate but not ribose, ribose 1-phosphate, or ribose 5- phosphate as a phosphoryl acceptor. JW4055 MMGKLIWLMGPSGSGKDSLLAELRLREQTQLLVAHRYITRDASAGSENHIALSEQEFFTRAGQNLLALSWHANGLYYGVGVEIDLWLHAGFDVLVNGSRAHLPQARARYQSALLPVCLQVSPEILRQRLENRGRENASEINARLARAARYTPQDCHTLNNDGSLRQSVDTLLTLIHQKEKHHACL phnN