1. D-Ribulose is the diastereomer of D-xylulose. 2. And the answer : ribulose biphosphate, of course. 3. Ribulose sugars are composed in the pentose phosphate pathway.4. Subsequently, phosphoribulose kinase converts ribulose 5-phosphate into ribulose 1, 5-bisphosphate. 5. Subsequently, phosphoribulose kinase converts ribulose 5-phosphate into ribulose 1, 5-bisphosphate. 6. PDB structure 3rub : the ribulose -1, 5-bisphosphate carboxylase / oxygenase from tobacco. 7. Therefore, xylulose 5-phosphate is reversibly converted into ribulose 5-phosphate by this epimerase. 8. For example, D-ribulose is an intermediate in the fungal pathway for D-arabitol production. 9. This is a mechanism by which phosphopentose epimerase converts ribulose 5-phosphate to xylulose 5-phosphate. 10. Without the regeneration of ribulose 1, 5-bisphosphate, the cycle will be unable to continue.
