出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/02/11 15:18:17」(JST)
Glyceraldehyde-3-phosphate dehydrogenase | |||||||||||||
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GAPDH with NAD+ and Pi bound to the active site. PDB rendering based on 2CZC. |
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Identifiers | |||||||||||||
Symbols | GAPDH ; G3PD; GAPD; HEL-S-162eP | ||||||||||||
External IDs | OMIM: 138400 MGI: 3646088 HomoloGene: 107053 ChEMBL: 2284 GeneCards: GAPDH Gene | ||||||||||||
EC number | 1.2.1.12 | ||||||||||||
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RNA expression pattern | |||||||||||||
More reference expression data | |||||||||||||
Orthologs | |||||||||||||
Species | Human | Mouse | |||||||||||
Entrez | 2597 | 14433 | |||||||||||
Ensembl | ENSG00000111640 | ENSMUSG00000057666 | |||||||||||
UniProt | P04406 | P16858 | |||||||||||
RefSeq (mRNA) | NM_001256799 | NM_001289726 | |||||||||||
RefSeq (protein) | NP_001243728 | NP_001276655 | |||||||||||
Location (UCSC) | Chr 12: 6.64 – 6.65 Mb |
Chr 6: 125.16 – 125.17 Mb |
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PubMed search | [1] | [2] | |||||||||||
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Glyceraldehyde 3-phosphate dehydrogenase, NAD binding domain | |||||||||
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determinants of enzyme thermostability observed in the molecular structure of thermus aquaticus d-glyceraldehyde-3-phosphate dehydrogenase at 2.5 angstroms resolution
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Identifiers | |||||||||
Symbol | Gp_dh_N | ||||||||
Pfam | PF00044 | ||||||||
Pfam clan | CL0063 | ||||||||
InterPro | IPR020828 | ||||||||
PROSITE | PDOC00069 | ||||||||
SCOP | 1gd1 | ||||||||
SUPERFAMILY | 1gd1 | ||||||||
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Glyceraldehyde 3-phosphate dehydrogenase, C-terminal domain | |||||||||
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crystal structure of glyceraldehyde-3-phosphate dehydrogenase from pyrococcus horikoshii ot3
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Identifiers | |||||||||
Symbol | Gp_dh_C | ||||||||
Pfam | PF02800 | ||||||||
Pfam clan | CL0139 | ||||||||
InterPro | IPR020829 | ||||||||
PROSITE | PDOC00069 | ||||||||
SCOP | 1gd1 | ||||||||
SUPERFAMILY | 1gd1 | ||||||||
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Glyceraldehyde 3-phosphate dehydrogenase (abbreviated as GAPDH or less commonly as G3PDH) (EC 1.2.1.12) is an enzyme of ~37kDa that catalyzes the sixth step of glycolysis and thus serves to break down glucose for energy and carbon molecules. In addition to this long established metabolic function, GAPDH has recently been implicated in several non-metabolic processes, including transcription activation, initiation of apoptosis,[1] ER to Golgi vesicle shuttling, and fast axonal, or axoplasmic transport.[2] In sperm, a testis-specific isoenzyme GAPDHS takes its role.
As its name indicates, glyceraldehyde 3-phosphate dehydrogenase (GAPDH) catalyses the conversion of glyceraldehyde 3-phosphate to D-glycerate 1,3-bisphosphate. This is the 6th step in the glycolytic breakdown of glucose, an important pathway of energy and carbon molecule supply which takes place in the cytosol of eukaryotic cells. The conversion occurs in two coupled steps. The first is favourable and allows the second unfavourable step to occur.
glyceraldehyde 3-phosphate | glyceraldehyde phosphate dehydrogenase | D-glycerate 1,3-bisphosphate | |
NAD+ +Pi | NADH + H+ | ||
NAD+ +Pi | NADH + H+ | ||
Compound C00118 at KEGG Pathway Database. Enzyme 1.2.1.12 at KEGG Pathway Database. Reaction R01063 at KEGG Pathway Database. Compound C00236 at KEGG Pathway Database.
The first reaction is the oxidation of glyceraldehyde 3-phosphate at the carbon 1 position (in the diagram it is shown as the 4th carbon from glycolysis), in which an aldehyde is converted into a carboxylic acid (ΔG°'=-50 kJ/mol (-12kcal/mol)) and NAD+ is simultaneously reduced endergonically to NADH.
The energy released by this highly exergonic oxidation reaction drives the endergonic second reaction (ΔG°'=+50 kJ/mol (+12kcal/mol)), in which a molecule of inorganic phosphate is transferred to the GAP intermediate to form a product with high phosphoryl-transfer potential: 1,3-bisphosphoglycerate (1,3-BPG).
This is an example of phosphorylation coupled to oxidation, and the overall reaction is somewhat endergonic (ΔG°'=+6.3 kJ/mol (+1.5)). Energy coupling here is made possible by GAPDH.
GAPDH uses covalent catalysis and general base catalysis to decrease the very large and positive activation energy of the second step of this reaction. First, a cysteine residue in the active site of GAPDH attacks the carbonyl group of GAP, creating a hemithioacetal intermediate (covalent catalysis). Next, an adjacent, tightly bound molecule of NAD+ accepts a hydride ion from GAP, forming NADH; GAP is concomitantly oxidized to a thioester intermediate using a molecule of water. This thioester species is much higher in energy than the carboxylic acid species that would result in the absence of GAPDH (the carboxylic acid species is so low in energy that the energy barrier for the second step of the reaction (phosphorylation) would be too high, and the reaction, therefore, too slow and equilibrium too unfavorable for a living organism). Donation of the hydride ion by the hemithioacetal is facilitated by its deprotonation by a histidine residue in the enzyme's active site (general base catalysis). Deprotonation encourages the reformation of the carbonyl group in the thioester intermediate and ejection of the hydride ion. NADH leaves the active site and is replaced by another molecule of NAD+, the positive charge of which stabilizes the negatively charged carbonyl oxygen in the transition state of the next and ultimate step. Finally, a molecule of inorganic phosphate attacks the thioester and forms a tetrahedral intermediate, which then collapses to release 1,3-bisphosphoglycerate, and the thiol group of the enzyme's cysteine residue.
This protein may use the morpheein model of allosteric regulation.[3]
Click on genes, proteins and metabolites below to link to respective articles. [§ 1]
GAPDH, like many other enzymes, has multiple functions. In addition to catalysing the 6th step of glycolysis, recent evidence implicates GAPDH in other cellular processes. This came as a surprise to researchers but it makes evolutionary sense to re-use and adapt existing proteins instead of evolving a novel protein from scratch.
GAPDH can also be inhibited by arsenate, inhibiting glycolysis in red blood cells and causing hemolytic anemia.
GAPDH can itself activate transcription. The OCA-S transcriptional coactivator complex contains GAPDH and lactate dehydrogenase, two proteins previously only thought to be involved in metabolism. GAPDH moves between the cytosol and the nucleus and may thus link the metabolic state to gene transcription.[4]
In 2005, Hara et al. showed that GAPDH initiates apoptosis. This is not a third function, but can be seen as an activity mediated by GAPDH binding to DNA like in transcription activation, discussed above. The study demonstrated that GAPDH is S-nitrosylated by NO in response to cell stress, which causes it to bind to the protein SIAH1, a ubiquitin ligase. The complex moves into the nucleus where Siah1 targets nuclear proteins for degradation, thus initiating controlled cell shutdown.[5] In subsequent study the group demonstrated that deprenyl, which has been used clinically to treat Parkinson's disease, strongly reduces the apoptotic action of GAPDH by preventing its S-nitrosylation and might thus be used as a drug.[6]
GAPDH acts as reversible metabolic switch under oxidative stress.[7] When cells are exposed to oxidants, they need excessive amounts of the antioxidant cofactor NADPH. In the cytosol, NADPH is reduced from NADP+ by several enzymes, three of them catalyze the first steps of the Pentose phosphate pathway. Oxidant-treatments cause an inactivation of GAPDH. This inactivation re-routes temporally the metabolic flux from glycolysis to the Pentose Phosphate Pathway, allowing the cell to generate more NADPH.[8] Under stress conditions, NADPH is needed by some antioxidant-systems including glutaredoxin and thioredoxin as well as being essential for the recycling of gluthathione.
GAPDH also appears to be involved in the vesicle transport from the endoplasmic reticulum (ER) to the Golgi apparatus which is part of shipping route for secreted proteins. It was found that GAPDH is recruited by rab2 to the vesicular-tubular clusters of the ER where it helps to form COP 1 vesicles. GAPDH is activated via tyrosine phosphorylation by Src.[9]
All steps of glycolysis take place in the cytosol and so does the reaction catalysed by GAPDH. Research in red blood cells indicates that GAPDH and several other glycolytic enzymes assemble in complexes on the inside of the cell membrane. The process appears to be regulated by phosphorylation and oxygenation.[10] Bringing several glycolytic enzymes close to each other is expected to greatly increase the overall speed of glucose breakdown.
Because the GAPDH gene is often stably and constitutively expressed at high levels in most tissues and cells, it is considered a housekeeping gene. For this reason, GAPDH is commonly used by biological researchers as a loading control for western blot and as a control for qPCR. However, researchers have reported different regulation of GAPDH under specific conditions.[11] For example, the transcription factor MZF-1 has been shown to regulate the GAPDH gene.[12] Therefore, the use of GAPDH as loading control has to be considered carefully.
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リンク元 | 「GAPD」 |
関連記事 | 「G3PD」 |
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