phosphogluconate dehydrogenase (decarboxylating) activity
Definition
Target type: molecularfunction
Catalysis of the reaction: 6-phospho-D-gluconate + NADP+ = D-ribulose 5-phosphate + CO2 + NADPH + H+. [EC:1.1.1.44]
Phosphogluconate dehydrogenase (decarboxylating) activity, also known as 6-phosphogluconate dehydrogenase (6PGDH), is a crucial enzyme in the pentose phosphate pathway (PPP). This metabolic pathway plays a vital role in various cellular processes, including:
* **NADPH production:** The primary function of 6PGDH is to catalyze the oxidative decarboxylation of 6-phosphogluconate (6PG) to ribulose 5-phosphate (Ru5P). This reaction is essential for generating NADPH, a crucial reducing agent used in biosynthetic processes like fatty acid and steroid synthesis, as well as antioxidant defense against reactive oxygen species (ROS).
* **Pentose synthesis:** The PPP also provides precursors for nucleotide biosynthesis through the conversion of Ru5P to ribose 5-phosphate (R5P), which is a key component of DNA and RNA.
* **Metabolic flexibility:** The PPP provides a route for glucose metabolism that is independent of glycolysis. This flexibility allows cells to adapt to changing metabolic demands, such as increased NADPH requirement under stress conditions.
6PGDH catalyzes a two-step reaction:
1. **Oxidation:** The enzyme uses NADP+ as an electron acceptor to oxidize 6PG, generating NADPH and 6-phosphogluconolactone.
2. **Decarboxylation:** The 6-phosphogluconolactone is then hydrolyzed to ribulose 5-phosphate (Ru5P), releasing carbon dioxide.
This enzymatic activity is crucial for maintaining cellular redox balance, nucleotide biosynthesis, and the overall metabolic flexibility of cells.'
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Proteins (1)
| Protein | Definition | Taxonomy |
|---|---|---|
| 6-phosphogluconate dehydrogenase, decarboxylating | A 6-phosphogluconate dehydrogenase, decarboxylating that is encoded in the genome of human. [PRO:DNx, UniProtKB:P52209] | Homo sapiens (human) |
Compounds (14)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| furosemide | furosemide : A chlorobenzoic acid that is 4-chlorobenzoic acid substituted by a (furan-2-ylmethyl)amino and a sulfamoyl group at position 2 and 5 respectively. It is a diuretic used in the treatment of congestive heart failure. Furosemide: A benzoic-sulfonamide-furan. It is a diuretic with fast onset and short duration that is used for EDEMA and chronic RENAL INSUFFICIENCY. | chlorobenzoic acid; furans; sulfonamide | environmental contaminant; loop diuretic; xenobiotic |
| ketotifen | ketotifen : An organic heterotricyclic compound that is 4,9-dihydro-10H-benzo[4,5]cyclohepta[1,2-b]thiophen-10-one which is substituted at position 4 by a 1-methylpiperidin-4-ylidene group. A blocker of histamine H1 receptors with a stabilising action on mast cells, it is used (usually as its hydrogen fumarate salt) for the treatment of asthma, where it may take several weeks to exert its full effect. Ketotifen: A cycloheptathiophene blocker of histamine H1 receptors and release of inflammatory mediators. It has been proposed for the treatment of asthma, rhinitis, skin allergies, and anaphylaxis. | cyclic ketone; olefinic compound; organic heterotricyclic compound; organosulfur heterocyclic compound; piperidines; tertiary amino compound | anti-asthmatic drug; H1-receptor antagonist |
| metoclopramide | metoclopramide : A member of the class of benzamides resulting from the formal condensation of 4-amino-5-chloro-2-methoxybenzoic acid with the primary amino group of N,N-diethylethane-1,2-diamine. Metoclopramide: A dopamine D2 antagonist that is used as an antiemetic. | benzamides; monochlorobenzenes; substituted aniline; tertiary amino compound | antiemetic; dopaminergic antagonist; environmental contaminant; gastrointestinal drug; xenobiotic |
| epigallocatechin gallate | (-)-epigallocatechin 3-gallate : A gallate ester obtained by the formal condensation of gallic acid with the (3R)-hydroxy group of (-)-epigallocatechin. epigallocatechin gallate: a steroid 5alpha-reductase inhibitor and antimutagen in green tea (Camellia sinensis) | flavans; gallate ester; polyphenol | antineoplastic agent; antioxidant; apoptosis inducer; geroprotector; Hsp90 inhibitor; neuroprotective agent; plant metabolite |
| epicatechin | (-)-epicatechin : A catechin with (2R,3R)-configuration. | catechin; polyphenol | antioxidant |
| gallocatechol | (-)-epigallocatechin : A flavan-3,3',4',5,5',7-hexol having (2R,3R)-configuration. | catechin; flavan-3,3',4',5,5',7-hexol | antioxidant; food component; plant metabolite |
| (-)-catechin | (-)-catechin : The (-)-enantiomer of catechin. | catechin | metabolite |
| epicatechin gallate | (-)-epicatechin-3-O-gallate : A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of epicatechin. A natural product found in Parapiptadenia rigida. epicatechin gallate: a steroid 5alpha-reductase inhibitor; RN given refers to the (cis)-isomer; structure given in first source; isolated from green tea | catechin; gallate ester; polyphenol | EC 3.2.1.1 (alpha-amylase) inhibitor; EC 3.2.1.20 (alpha-glucosidase) inhibitor; metabolite |
| methotrexate | dicarboxylic acid; monocarboxylic acid amide; pteridines | abortifacient; antimetabolite; antineoplastic agent; antirheumatic drug; dermatologic drug; DNA synthesis inhibitor; EC 1.5.1.3 (dihydrofolate reductase) inhibitor; immunosuppressive agent | |
| (-)-gallocatechin gallate | (-)-gallocatechin gallate : A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of (-)-gallocatechin. A natural product found in found in green tea. | catechin; gallate ester; polyphenol | antineoplastic agent; EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor; human xenobiotic metabolite; plant metabolite |
| 4-phospho-d-erythronohydroxamic acid | |||
| 4-phosphoerythronate | 4-phospho-D-erythronic acid : The D-enantiomer of 4-phosphoerythronic acid. 4-phosphoerythronate: inhibits ribose-5-phosphate isomerase | 4-phosphoerythronic acid | Escherichia coli metabolite; mouse metabolite |
| (-)-catechin-3-O-gallate | (-)-catechin-3-O-gallate : A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of (-)-catechin. | flavans; gallate ester; polyphenol | metabolite |
| mobic | meloxicam : A benzothiazine that is piroxicam in which the pyridin-2-yl group is replaced by a 5-methyl-1,3-thiazol-2-yl group. A non-steroidal anti-inflammatory drug and selective inhibitor of COX-2, it is used particularly for the management of rheumatoid arthritis. Meloxicam: A benzothiazine and thiazole derivative that acts as a NSAID and cyclooxygenase-2 (COX-2) inhibitor. It is used in the treatment of RHEUMATOID ARTHRITIS; OSTEOARTHRITIS; and ANKYLOSING SPONDYLITIS. | 1,3-thiazoles; benzothiazine; monocarboxylic acid amide | analgesic; antirheumatic drug; cyclooxygenase 2 inhibitor; non-steroidal anti-inflammatory drug |