Ribulose-1,5-bisphosphate

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Ribulose-1,5-bisphosphate

Ribulose-1,5-bisphosphate (RuBP) is an important intermediate in the Calvin-Benson cycle taking place during photosynthesis. It is the substrate used by the enzyme RuBisCO to fix carbon dioxide to create two molecules of glycerate 3-phosphate (GP), this is then reduced in the Calvin-Benson cycle. Ribulose-1,5-bisphosphate is regenerated in the Calvin-Benson cycle using ATP from the light-dependent reactions of photosynthesis, the 6-carbon sugar produced is used to synthesize starch, amino acids, lipids, etc. This molecule of glucose that is produced from two triose sugar molecules is made using the glycolysis enzyme in reverse.

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