Ribulose-5-Phosphate Kinase is the enzyme that catalyzes the reaction below in the Calvin cycle.

Ribulose-5-Phosphate + ATP <=> Ribulose-1,5-Bisphosphate + ADP

This reaction is one of the few in the Calvin cycle that do not have an equivalent reaction in the pentose phosphate pathway.

1. CO2 Fixation in Bacteria

2. CO2 Fixation in Plants