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the enzyme is part of the modified Embden–Meyerhof–Parnas pathway, the main route for carbohydrate metabolism in Thermoproteus tenax
the enzyme is part of the modified glycolytic pathway of Thermoproteus tenax. In the classical Embden–Meyerhof–Parnas 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 Embden–Meyerhof–Parnas 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 The non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase/glyceraldehyde-3-phosphate ferredoxin oxidoreductase substitution in the catabolic Embden–Meyerhof–Parnas 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
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