Ribulose-1,5-Bisphosphate (RuBP)

RuBP is the intermediate of the Calvin cycle onto which CO 2 is added in the process of carbon dioxide fixation. The reaction below is catalyzed by the enzyme called rubisco

RuBP + CO 2 + H 2 O <=> 2 3-Phosphoglycerate + 2 H+

RuBP is made by action of a kinase acting on ribulose-5-phosphate, as follows:

> Ribulose-5-Phosphate + ATP <=> RuBP + ADP

See also: Calvin Cycle, Rubisco, Photorespiration