Pentose Phosphate Pathway

Pentose Phosphate Pathway

Oxidative Branch

Reaction	Enzyme
Glucose 6-Phosphate + NADP+ -> 6-Phosphoglucono-δ-Lactone + NADPH + H+	Glucose 6-Phophate Dehydrogenase
6-Phosphoglucono-δ-Lactone + H2O -> 6-Phosphogluconate + H+	Lactonase
6-Phosphogluconate + NADP+ -> Ribulose 5-Phosphate + CO2 + NADPH	6-Phosphogluconate Dehydrogenase
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Non-Oxidative Branch

Reaction	Enzyme
Ribulose 5-Phosphate <=> Ribose 5-Phosphate	Phosphopentose Isomerase
Ribulose 5-Phosphate <=> Xylulose 5-Phosphate	Phosphopentose Epimerase
Xylulose 5-Phosphate + Ribose 5-Phosphate <=> Sedoheptulose 7-Phosphate + Glyceraldehyde 3-Phosphate	Transketolase
Sedoheptulose 7-Phosphate + Glyceraldehyde 3-Phosphate <=> Fructose 6-Phosphate + Erythrose 4-Phosphate	Transaldolase
Xylulose 5-Phosphate + Erythrose 4-Phosphate <=> Fructose 6-Phosphate + Glyceraldehyde 3-Phosphate	Transketolase
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Reference: p.431 of Lubert Stryer's "Biochemistry" 3rd Edition, 1988, W. H. Freeman, New York (ISBN=0-7167-1843-X).