1.2.1.90: glyceraldehyde-3-phosphate dehydrogenase [NAD(P)+]
This is an abbreviated version!
For detailed information about glyceraldehyde-3-phosphate dehydrogenase [NAD(P)+], go to the full flat file.
Reaction
Synonyms
GAPN, More, NAD+-dependent glyceraldehyde-3-phosphate dehydrogenase, NAD+-dependent non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase, non-phosphorylating Ga3PDHase, non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase, nonphosphorylating NAD+-dependent GAPN
ECTree
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General Information
General Information on EC 1.2.1.90 - glyceraldehyde-3-phosphate dehydrogenase [NAD(P)+]
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metabolism
physiological function
the enzyme is part of the modified EmbdenÂMeyerhofÂParnas pathway, the main route for carbohydrate metabolism in Thermoproteus tenax
metabolism
the enzyme is part of the modified glycolytic pathway of Thermoproteus tenax. In the classical EmbdenÂMeyerhofÂParnas glycolysis, as found in Eucarya and Bacteria, the oxidation of D-glyceraldehyde 3-phosphate is coupled to phosphorylation to yield 1,3-diphosphoglycerate, which in turn is utilized by phosphoglycerate kinase giving 3-phosphoglycerate and ATP. These steps are reversible and non-regulated in the common EmbdenÂMeyerhofÂParnas pathway. In contrast, the direct and irreversible oxidation of D-glyceraldehyde 3-phosphate to 3-phospho-D-glycerate without production of ATP is catalysed either by non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase or by glyceraldehyde-3-phosphate ferredoxin oxidoreductase (EC 1.2.1.59). The non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase/glyceraldehyde-3-phosphate ferredoxin oxidoreductase substitution in the catabolic EmbdenÂMeyerhofÂParnas pathway avoids the production of the highly thermolabile compound 1,3-diphosphoglycerate and could minimize the pools of the thermolabile intermediates D-glyceraldehyde 3-phosphate and dihydroxyacetonphosphate by driving the carbon flow down the pathway and thus reducing the velocity of their heat destruction
enzyme GabD irreversibly oxidizes D-glyceraldehyde 3-phosphate (Ga3P) to 3-phospho-D-glycerate (3Pglycerate) using NAD+ or NADP+, thus resembling a non-phosphorylating Ga3PDHase. But the enzyme shows about 6fold higher Km value and three orders of magnitude higher catalytic efficiency with succinate semialdehyde (SSA) and NADP+. Indeed, the GabD protein identity corresponds to an SSA dehydrogenase (SSADHase, EC 1.2.1.16)
physiological function
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enzyme GabD irreversibly oxidizes D-glyceraldehyde 3-phosphate (Ga3P) to 3-phospho-D-glycerate (3Pglycerate) using NAD+ or NADP+, thus resembling a non-phosphorylating Ga3PDHase. But the enzyme shows about 6fold higher Km value and three orders of magnitude higher catalytic efficiency with succinate semialdehyde (SSA) and NADP+. Indeed, the GabD protein identity corresponds to an SSA dehydrogenase (SSADHase, EC 1.2.1.16)
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physiological function
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enzyme GabD irreversibly oxidizes D-glyceraldehyde 3-phosphate (Ga3P) to 3-phospho-D-glycerate (3Pglycerate) using NAD+ or NADP+, thus resembling a non-phosphorylating Ga3PDHase. But the enzyme shows about 6fold higher Km value and three orders of magnitude higher catalytic efficiency with succinate semialdehyde (SSA) and NADP+. Indeed, the GabD protein identity corresponds to an SSA dehydrogenase (SSADHase, EC 1.2.1.16)
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physiological function
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enzyme GabD irreversibly oxidizes D-glyceraldehyde 3-phosphate (Ga3P) to 3-phospho-D-glycerate (3Pglycerate) using NAD+ or NADP+, thus resembling a non-phosphorylating Ga3PDHase. But the enzyme shows about 6fold higher Km value and three orders of magnitude higher catalytic efficiency with succinate semialdehyde (SSA) and NADP+. Indeed, the GabD protein identity corresponds to an SSA dehydrogenase (SSADHase, EC 1.2.1.16)
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physiological function
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enzyme GabD irreversibly oxidizes D-glyceraldehyde 3-phosphate (Ga3P) to 3-phospho-D-glycerate (3Pglycerate) using NAD+ or NADP+, thus resembling a non-phosphorylating Ga3PDHase. But the enzyme shows about 6fold higher Km value and three orders of magnitude higher catalytic efficiency with succinate semialdehyde (SSA) and NADP+. Indeed, the GabD protein identity corresponds to an SSA dehydrogenase (SSADHase, EC 1.2.1.16)
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