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Glycerophospholipids have three components: fatty acid lipid groups (orange), glycerol backbone (white), and 3-phosphate ester (green) Glycerol 3-phosphate is a starting material for de novo synthesis of glycerolipids. In eukaryotes, it is first acylated on its sn-1 position by an ER- or mitochondrial membrane enzyme, glycerol-3-phosphate O ...
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 ...
When dihydroxyacetone phosphate is produced, glyceroneogenesis will branch off from gluconeogenesis. [1] With the expense of NADH, dihydroxyacetone phosphate will convert to glycerol 3-phosphate, which is the final product of glyceroneogenesis. In addition, triglyceride can be generated by re-esterifying 3 fatty acid chains on glycerol 3-phosphate.
Glycerol-3-phosphate dehydrogenase (GPDH) is an enzyme that catalyzes the reversible redox conversion of dihydroxyacetone phosphate (a.k.a. glycerone phosphate, outdated) to sn-glycerol 3-phosphate. [2] Glycerol-3-phosphate dehydrogenase serves as a major link between carbohydrate metabolism and lipid metabolism.
In enzymology, a glycerol-3-phosphate O-acyltransferase (EC 2.3.1.15) is an enzyme that catalyzes the chemical reaction acyl-CoA + sn-glycerol 3-phosphate ⇌ {\displaystyle \rightleftharpoons } CoA + 1-acyl-sn-glycerol 3-phosphate
Glycerophospholipids are derived from glycerol-3-phosphate in a de novo pathway. [3] The term glycerophospholipid signifies any derivative of glycerophosphoric acid that contains at least one O-acyl, or O-alkyl, or O-alk-1'-enyl residue attached to the glycerol moiety. [4] The phosphate group forms an ester linkage to the glycerol.
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]
In enzymology, a glycerol-3-phosphate-glucose phosphotransferase (EC 2.7.1.142) is an enzyme that catalyzes the chemical reaction sn-glycerol 3-phosphate + D-glucose ⇌ {\displaystyle \rightleftharpoons } glycerol + D-glucose 6-phosphate