What Is the Function of RuBP?

RuBP or ribulose bisphosphate is the primary acceptor of CO2 in the Calvin cycle. It is a five-carbon ketose sugar. In the first step of the Calvin cycle, RuBP is carboxylated by the enzyme RuBisCO or RuBP carboxylase to produce 3-phosphoglyceric acid (PGA). RuBP is regenerated at the end of the cycle.

Calvin Cycle

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