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The glycerol phosphate shuttle was first characterized as a major route of mitochondrial hydride transport in the flight muscles of blow flies. [5] [6] It was initially believed that the system would be inactive in mammals due to the predominance of lactate dehydrogenase activity over glycerol-3-phosphate dehydrogenase 1 (GPD1) [5] [7] until high GPD1 and GPD2 activity were demonstrated in ...
Glycerol-3-phosphate was found to be a substrate for the enzyme phosphoglycolate phosphatase (PGP, or G3PP) in mammals in 2015. [2] G3PP activity has subsequently been suggested to have a regulatory role in central metabolism [ 2 ] and stress response.
The two main systems in humans are the glycerol phosphate shuttle and the malate-aspartate shuttle. The malate/a-ketoglutarate antiporter functions move electrons while the aspartate/glutamate antiporter moves amino groups. This allows the mitochondria to receive the substrates that it needs for its functionality in an efficient manner. [1]
Oxidation of cytoplasmic NADH by the cytosolic form of the enzyme creates glycerol-3-phosphate from dihydroxyacetone phosphate. Once the glycerol-3-phosphate has moved through the outer mitochondrial membrane it can then be oxidised by a separate isoform of glycerol-3-phosphate dehydrogenase that uses quinone as an oxidant and FAD as a co ...
The encoded cytosolic protein and mitochondrial glycerol-3-phosphate dehydrogenase also form a glycerol phosphate shuttle that facilitates the transfer of reducing equivalents from the cytosol to mitochondria. Mutations in this gene are a cause of transient infantile hypertriglyceridemia.
Thus, the two substrates of this enzyme are sn-glycerol 3-phosphate and D-glucose, whereas its two products are glycerol and D-glucose 6-phosphate. This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this ...
The 3 substrates of this enzyme are ATP, H 2 O, and glycerol-3-phosphate, whereas its 3 products are ADP, phosphate, and glycerol-3-phosphate. This enzyme belongs to the family of hydrolases , specifically those acting on acid anhydrides to catalyse transmembrane movement of substances.
The 3 substrates of this enzyme are sn-glycerol 3-phosphate, NAD +, and NADP +, whereas its 4 products are glycerone phosphate, NADH, NADPH, and H +. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD + or NADP + as acceptor. The systematic name of this enzyme class is sn ...