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