Phosphopentose epimerase
Encyclopedia
Phosphopentose epimerase is an enzyme which intraconverts ribulose 5-phosphate
Ribulose 5-phosphate
Ribulose 5-phosphate is one of the end-products of the pentose phosphate pathway. It is also an intermediate in the Calvin cycle.It is formed by phosphogluconate dehydrogenase, and it can be acted upon by phosphopentose isomerase and phosphopentose epimerase....

 and xylulose 5-phosphate
Xylulose 5-phosphate
D-Xylulose 5-phosphate is an intermediate in the Pentose Phosphate Pathway. It is a ketose sugar formed from ribulose-5-phosphate...

.

It plays a role in the Calvin cycle
Calvin cycle
The Calvin cycle or Calvin–Benson-Bassham cycle or reductive pentose phosphate cycle or C3 cycle or CBB cycle is a series of biochemical redox reactions that take place in the stroma of chloroplasts in photosynthetic organisms...

 and the pentose phosphate pathway
Pentose phosphate pathway
The pentose phosphate pathway is a process that generates NADPH and pentoses . There are two distinct phases in the pathway. The first is the oxidative phase, in which NADPH is generated, and the second is the non-oxidative synthesis of 5-carbon sugars...

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