If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.
|Superclasses:||Generation of Precursor Metabolites and Energy → Glycolysis|
Glycolysis, which was first studied as a pathway for the utilization of glucose, is one of the major pathways of central metabolism, the other two being the pentose phosphate pathway and the TCA cycle. Glycolysis is essential under all conditions of growth, because it produces six of the 13 precursor metabolites that are the starting materials for the biosynthesis of building blocks for macromolecules and other needed small molecules (the six compounds are β-D-glucose 6-phosphate, β-D-fructofuranose 6-phosphate, glycerone phosphate, 3-phospho-D-glycerate, phosphoenolpyruvate, and pyruvate). Glycolysis can be found, if at least in part, in almost all organisms.
Even though glycolysis is often described starting with glucose, other hexoses (e.g. fructose) can also serve as input (as its name implies - glycose is a general term for simple sugars).
Glycolysis has evolved to fulfill two essential functions:
ii) being an amphibolic pathway (pathway that involves both catabolism and anabolism), it can reversibly produce hexoses from various low-molecular weight molecules.
Because various degradation pathways feed into glycolysis at many different points, glycolysis or portions of it run in the forward or reverse direction, depending on the carbon source being utilized, in order to satisfy the cell's need for precursor metabolites and energy. This switching of direction is possible because all but two of the enzymatic reactions comprising glycolysis are reversible, and the conversions catalyzed by the two exceptions are rendered functionally reversible by other enzymes (fructose-1,6-bisphosphatase and phosphoenolpyruvate synthetase) that catalyze different irreversible reactions flowing in the opposite direction.
About This Pathway
The standard glycolysis pathway (glycolysis I (from glucose 6-phosphate)) depicts the sugar input into the pathway as glucose. However, the glycolysis pathway is utilized for the degradation of many different types of sugars.
This partial depiction of the glycolysis pathway is used with substrates other than glucose, such as D-allose, L-sorbopyranose , D-mannitol , D-sorbitol , D-mannose and sucrose, which are processed into β-D-fructofuranose 6-phosphate. D-fructose 6-phosphate enters glycolysis and is processed to the end product pyruvate, which is often fermented further into fermentation products such as ethanol, lactate and acetate.
Superpathways: superpathway of N-acetylneuraminate degradation , superpathway of hexitol degradation (bacteria) , hexitol fermentation to lactate, formate, ethanol and acetate , superpathway of anaerobic sucrose degradation
Unification Links: EcoCyc:PWY-5484
Abbe83: Abbe K, Takahashi S, Yamada T (1983). "Purification and properties of pyruvate kinase from Streptococcus sanguis and activator specificity of pyruvate kinase from oral streptococci." Infect Immun 39(3);1007-14. PMID: 6840832
AitBara10: Ait-Bara S, Carpousis AJ (2010). "Characterization of the RNA degradosome of Pseudoalteromonas haloplanktis: conservation of the RNase E-RhlB interaction in the gammaproteobacteria." J Bacteriol 192(20);5413-23. PMID: 20729366
Ajdic02: Ajdic D, McShan WM, McLaughlin RE, Savic G, Chang J, Carson MB, Primeaux C, Tian R, Kenton S, Jia H, Lin S, Qian Y, Li S, Zhu H, Najar F, Lai H, White J, Roe BA, Ferretti JJ (2002). "Genome sequence of Streptococcus mutans UA159, a cariogenic dental pathogen." Proc Natl Acad Sci U S A 99(22);14434-9. PMID: 12397186
Al04: Al Zaid Siddiquee K, Arauzo-Bravo MJ, Shimizu K (2004). "Metabolic flux analysis of pykF gene knockout Escherichia coli based on 13C-labeling experiments together with measurements of enzyme activities and intracellular metabolite concentrations." Appl Microbiol Biotechnol 63(4);407-17. PMID: 12802531
Alefounder89: Alefounder PR, Baldwin SA, Perham RN, Short NJ (1989). "Cloning, sequence analysis and over-expression of the gene for the class II fructose 1,6-bisphosphate aldolase of Escherichia coli." Biochem J 1989;257(2);529-34. PMID: 2649077
Alefounder89a: Alefounder PR, Perham RN (1989). "Identification, molecular cloning and sequence analysis of a gene cluster encoding the class II fructose 1,6-bisphosphate aldolase, 3-phosphoglycerate kinase and a putative second glyceraldehyde 3-phosphate dehydrogenase of Escherichia coli." Mol Microbiol 3(6);723-32. PMID: 2546007
Alvarez98: Alvarez M, Zeelen JP, Mainfroid V, Rentier-Delrue F, Martial JA, Wyns L, Wierenga RK, Maes D (1998). "Triose-phosphate isomerase (TIM) of the psychrophilic bacterium Vibrio marinus. Kinetic and structural properties." J Biol Chem 273(4);2199-206. PMID: 9442062
Arifuzzaman06: Arifuzzaman M, Maeda M, Itoh A, Nishikata K, Takita C, Saito R, Ara T, Nakahigashi K, Huang HC, Hirai A, Tsuzuki K, Nakamura S, Altaf-Ul-Amin M, Oshima T, Baba T, Yamamoto N, Kawamura T, Ioka-Nakamichi T, Kitagawa M, Tomita M, Kanaya S, Wada C, Mori H (2006). "Large-scale identification of protein-protein interaction of Escherichia coli K-12." Genome Res 16(5);686-91. PMID: 16606699
Ashizawa91: Ashizawa K, McPhie P, Lin KH, Cheng SY (1991). "An in vitro novel mechanism of regulating the activity of pyruvate kinase M2 by thyroid hormone and fructose 1, 6-bisphosphate." Biochemistry 30(29);7105-11. PMID: 1854723
Auzat92: Auzat I, Garel JR (1992). "pH dependence of the reverse reaction catalyzed by phosphofructokinase I from Escherichia coli: implications for the role of Asp 127." Protein Sci 1(2);254-8. PMID: 1304907
Auzat94: Auzat I, Le Bras G, Garel JR (1994). "The cooperativity and allosteric inhibition of Escherichia coli phosphofructokinase depend on the interaction between threonine-125 and ATP." Proc Natl Acad Sci U S A 91(12);5242-6. PMID: 8202475
Auzat94a: Auzat I, Le Bras G, Branny P, De La Torre F, Theunissen B, Garel JR (1994). "The role of Glu187 in the regulation of phosphofructokinase by phosphoenolpyruvate." J Mol Biol 235(1);68-72. PMID: 7904653
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