Glyceraldehyde-3-phosphate dehydrogenase (NADP+)
Enzyme
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Glyceraldehyde-3-phosphate dehydrogenase (NADP+) (EC 1.2.1.9) (GAPN) is an enzyme that irreversibly catalyzes the oxidation of glyceraldehyde-3-phosphate (GAP) to 3-phosphoglycerate (3-PG or 3-PGA) using the reduction of NADP+ to NADPH. GAPN is used in a variant of glycolysis that conserves energy as NADPH rather than as ATP. The NADPH and 3-PG can then be used for synthesis. The most familiar variant of glycolysis uses glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and phosphoglycerate kinase to produce ATP. GAPDH is phosphorylating. GAPN is non-phosphorylating.
| Glyceraldehyde-3-phosphate dehydrogenase (NADP+) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 1.2.1.9 | ||||||||
| CAS no. | 9028-92-6 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
GAPN was reported first by Rosenberg and Arnon in 1954.[1] It has been found in plants, algae, and bacteria.[2]
Reactions
Glyceraldehyde-3-phosphate dehydrogenase (NADP+) catalyzes the reaction:[3]
Glyceraldehyde-3-phosphate dehydrogenase takes the same substrate but converts it to 1,3-bisphosphoglyceric acid, adding a phosphate group (Pi):[4]
