126.96.36.199, 188.8.131.52, 3-Phospho-(D)- glyceroyl-phosphate, ALDOA Homotetramer, (D)-Glyceraldehyde 3-phosphate, PGAM3, 184.108.40.206, PGK2 Monomer, G6PT, MDH2 Homodimer, PGK1 Monomer, Dihydroxyacetone phosphate, PGAM2 Homodimer, G6PT1, Dimer of identical or nonidentical chains of three types, GLUT4, HXK4, PFKM Tetramer, G6PI Homodimer, 220.127.116.11, D-glucose, PPCKM, ENO2, TPI1 Homodimer, F16P Homotetramer, Alpha-D-glucose -6-phosphate, 18.104.22.168, 22.214.171.124, KPYR Homotetramer, 126.96.36.199, 188.8.131.52, HXK1 Monomer, 184.108.40.206, 220.127.116.11, 2-oxosuccinate, Pyruvate, (S)-Malic acid, (S)-Malic acid, 18.104.22.168, 22.214.171.124, 2-Oxo-succinic acid, PMGE Homodimer, G3PT Homotetramer, F16Q, G3P1 Homotetramer, 2-Phospho- (D)-glyceric acid, 126.96.36.199, ALDOC Homotetramer, HXK2 Monomer, PFKP Tetramer, Pyruvic acid, PKM2 Homotetramer, 188.8.131.52, Beta-D-fructose-1,6-bisphosphate, 184.108.40.206, PYC, 220.127.116.11, ENO3, PGAM1 Homodimer, D-Glycerate 3-phosphate, Phosphoenol pyruvate, HXK3 Monomer, PFKL Tetramer, G3P2 Homotetramer, PPCKC, transport, Beta-D-fructose -6-phosphate, Glucose, ALDOB Homotetramer, MDH1 Homodimer, ENO1
Glycolysis and gluconeogenesis (short map)
D-Glucose is the major energy source for mammalian cells as well as an important substrate for protein and lipid synthesis. Mammalian cells take up D-Glucose from extracellular fluid into the cell through two families of structurally related glucose transporters. Solute carrier family 2 (facilitated glucose transporter), member 4 ( GLUT4 ) is one such transporters. It mediates bidirectional and energy-independent process of glucose transport in most tissues and cells , .
The first step of D-Glucose conversion is its immediate phosphorylation to alpha - D-Glucose-6-phosphate by the family of hexokinases: Hexokinase 1 ( HXK1) , , , Hexokinase 2 (HXK2) , , Hexokinase 3 ( HXK3) , , and Glucokinase (hexokinase 4) HXK4 , . The reverse reaction takes place in gluconeogenesis and plays a crucial role in maintaining D-Glucose homeostasis. Solute carrier family 37 (glucose-6-phosphate transporter), member 4 ( G6PT1 ) translocates alpha - D-Glucose-6-phosphate from the cytoplasm into the lumen of the endoplasmic reticulum ,  where Glucose-6-phosphatase, catalytic subunit ( G6PT ) hydrolyses the alpha - D-Glucose-6-phosphate into D-Glucose and phosphate , .
Alpha - D-Glucose-6-phosphate is further converted to Beta-D-Fructose 6-phosphate by Glucose phosphate isomerase ( GPI ) , , . Then, phosphofructokinases (Phosphofructokinase, muscle - PFKM, Phosphofructokinase, platelet - PFKP, Phosphofructokinase, liver - PFKL ) attach the second phosphate group to Beta-D-Fructose 6-phosphate resulting in formation of Beta-D-Fructose 1,6-bisphosphate , , . Beta-D-Fructose 1,6-bisphosphate is further hydrolyzed by important gluconeogenic enzymes Fructose-1,6-bisphosphatase 1 ( F16P) and Fructose-1,6-bisphosphatase 2 ( F16Q ) to Beta-D-Fructose 6-phosphate and phosphate , .
Vertebrate aldolases exist as three isozymes with different tissue distributions and kinetics: Aldolase A, fructose-bisphosphate ( ALDOA ) (muscle and red blood cell), Aldolase B, fructose-bisphosphate ( ALDOB ) (liver, kidney, and small intestine), and Aldolase C fructose-bisphosphate ( ALDOC ) (brain and neuronal tissue). These are ubiquitous enzymes that catalyze the reversible aldol cleavage of Beta-D-Fructose 1,6-bisphosphate (and also D-Fructose-1-phosphate ) to Dihydroxyacetone phosphate and either (D)-Glyceraldehyde 3-phosphate or Glyceraldehyde, respectively , , . Dihydroxyacetone phosphate is further reversibly isomerized to (D)-Glyceraldehyde 3-phosphate by Triosephosphate isomerase 1 ( TPI1 ) , .
(D)-Glyceraldehyde 3-phosphate is metabolized to 3-Phospho-(D)-glyceroyl phosphate by glyceraldehyde-3-phosphate dehydrogenases ( G3P1, G3P2, G3PT ) , , . Enzymes Phosphoglycerate kinase 1 ( PGK1 ), Phosphoglycerate kinase 2 ( PGK2 ) catalyze the reversible transfer of a phosphoryl group from 3-Phospho-(D)-glyceroyl phosphate to ADP which results in formation of D-Glycerate 3-phosphate , , . D-Glycerate 3-phosphate is enzymatically converted into 2-Phospho-(D)-glyceric acid by phosphoglycerate mutase that has several isoforms: Phosphoglycerate mutase 1 (brain) - PGAM1, Phosphoglycerate mutase 2 (muscle) - PGAM2, Phosphoglycerate mutase family 3 - PGAM3, and by a multifunctional enzyme 2,3-Bisphosphoglycerate mutase ( PMGE ) , , , , . After releasing water, catalyzed by Enolase 1, (alpha), ( ENO1 ), Enolase 3 (beta, muscle) (ENO3), Enolase 2 (gamma, neuronal) ( ENO2 ) Phosphoenolpyruvate is formed , , . Then it is converted to Pyruvic acid by Pyruvate kinase, liver and RBC ( KPYR ) ,  and Pyruvate kinase, muscle ( PKM2 ) , .
Pyruvate carboxylase ( PYC ) converts Pyruvic acid to 2-Oxo-succinic acid ,  that is reversibly reduced by Malate dehydrogenase 1, NAD (soluble) ( MDH1 ) and Malate dehydrogenase 2, NAD (mitochondrial) ( MDH2 ) to (S)-Malic acid , , ,  and is metabolized back to Phosphoenolpyruvate by Phosphoenolpyruvate carboxykinase 2 (mitochondrial) ( PPCKM ) ,  and Phosphoenolpyruvate carboxykinase 1 (soluble) ( PPCKC ) , .