Ribose 1,5-bisphosphate phosphokinase () is an enzyme that catalyzes the chemical reaction
The enzyme characterised from a mutant Escherichia coli converts D-ribose 1,5-bisphosphate to phosphoribosyl pyrophosphate by transferring a phosphate group from the cofactor, adenosine triphosphate (ATP), which is converted to adenosine diphosphate (ADP).
This enzyme is a transferase, specifically one transferring phosphorus-containing groups (phosphotransferases) with a phosphate group as acceptor. The systematic name of this enzyme class is ATP:ribose-1,5-bisphosphate phosphotransferase. Other names in common use include ribose 1,5-bisphosphokinase, and PhnN.
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