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Pathway Description
Glycolysis
Homo sapiens
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2013-08-19
Last Updated: 2022-11-28
Glycolysis is a metabolic pathway with sequence of ten reactions involving ten intermediate compounds that converts glucose to pyruvate. Glycolysis release free energy for forming high energy compound such as ATP and NADH. Glycolysis is consisted of two phases, which one of them is chemical priming phase and second phase is energy-yielding phase. As the starting compound of chemical priming phase, D-glucose can be obtained from galactose metabolism or imported by monosaccharide-sensing protein 1 from outside of cell. D-Glucose is catalyzed by probable hexokinase-like 2 protein to form glucose 6-phosphate which is powered by ATP. Glucose 6-phosphate transformed to fructose 6-phosphate by glucose-6-phosphate isomerase, which the later compound will be converted to fructose 1,6-bisphosphate, which is the last reaction of chemical priming phase by 6-phosphofructokinase with cofactor magnesium, and it is also powered by ATP. Before entering the second phase, aldolase catalyzing the hydrolysis of F1,6BP into dihydroxyacetone phosphate and glyceraldehyde 3-phosphate. Dihydroxyacetone phosphate and glyceraldehyde 3-phosphate can convert to each other bidirectionally by facilitation of triosephosphate isomerase. The second phase of glycolysis is yielding-energy phase that produce ATP and NADH. At the first step, D-glyceraldehyde 3-phosphate is catalyzed to glyceric acid 1,3-biphosphate by glyceraldehyde-3-phosphate dehydrogenase with NAD, which also generate NADH. ATP is generated through the reaction that convert glyceric acid 1,3-biphosphate to 3-phosphoglyceric acid. Phosphoglycerate mutase 2 catalyze 3-phosphoglyceric acid to 2-Phospho-D-glyceric acid, and alpha-enolase with cofactor magnesium catalyzes 2-Phospho-D-glyceric acid to phosphoenolpyruvic acid. Eventually, plastidial pyruvate kinase 4 converts phosphoenolpyruvic acid to pyruvate with cofactor magnesium and potassium and ADP. Pyruvate will undergo pyruvate metabolism, tyrosine metabolism and pantothenate and CoA biosynthesis.
References
Glycolysis References
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Pubmed: 23185017
Deeb SS, Malkki M, Laakso M: Human hexokinase II: sequence and homology to other hexokinases. Biochem Biophys Res Commun. 1993 Nov 30;197(1):68-74. doi: 10.1006/bbrc.1993.2442.
Pubmed: 8250948
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Pubmed: 8786021
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Pubmed: 15815621
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Nakajima H, Noguchi T, Yamasaki T, Kono N, Tanaka T, Tarui S: Cloning of human muscle phosphofructokinase cDNA. FEBS Lett. 1987 Oct 19;223(1):113-6. doi: 10.1016/0014-5793(87)80519-7.
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Sakakibara M, Mukai T, Hori K: Nucleotide sequence of a cDNA clone for human aldolase: a messenger RNA in the liver. Biochem Biophys Res Commun. 1985 Aug 30;131(1):413-20. doi: 10.1016/0006-291x(85)91818-2.
Pubmed: 3840020
Izzo P, Costanzo P, Lupo A, Rippa E, Borghese AM, Paolella G, Salvatore F: A new human species of aldolase A mRNA from fibroblasts. Eur J Biochem. 1987 Apr 1;164(1):9-13. doi: 10.1111/j.1432-1033.1987.tb10984.x.
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Pubmed: 3391172
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