If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.
Locations of Mapped Genes:
|Superclasses:||Degradation/Utilization/Assimilation → Secondary Metabolites Degradation → Sugar Derivatives Degradation → Sugar Alcohols Degradation|
Of the six existing hexitols only three (D-mannitol, D-sorbitol [glucitol], and galactitol [owing to symmetry, D- and L-galactitol are identical]) occur naturally and each of these can be utilized by E. coli K-12 as a total source of carbon and energy. Each enters the cell via a specific phosphotransferase system so the first intracellular species is the 6-phospho derivative. D-sorbitol-6-phosphate is converted by a single dehydrogenase reaction to the glycolytic intermediate, D-fructose-6-phosphate and hence flows through the pathways of central metabolism to satisfy the cell's need for precursor metabolites, reducing power, and metabolic energy.
Review: Mayer, C. and W. Boos, Hexose/Pentose and Hexitol/Pentitol Metabolism. EcoSal Module 3.4.1 [ECOSAL]
Superpathways: superpathway of hexitol degradation (bacteria)
DiazMejia09: Diaz-Mejia JJ, Babu M, Emili A (2009). "Computational and experimental approaches to chart the Escherichia coli cell-envelope-associated proteome and interactome." FEMS Microbiol Rev 33(1);66-97. PMID: 19054114
Lengeler75: Lengeler J (1975). "Mutations affecting transport of the hexitols D-mannitol, D-glucitol, and galactitol in Escherichia coli K-12: isolation and mapping." J Bacteriol 1975;124(1);26-38. PMID: 1100602
Novotny84: Novotny MJ, Reizer J, Esch F, Saier MH (1984). "Purification and properties of D-mannitol-1-phosphate dehydrogenase and D-glucitol-6-phosphate dehydrogenase from Escherichia coli." J Bacteriol 1984;159(3);986-90. PMID: 6384188
Roux06: Roux C, Salmon L, Verchere-Beaur C (2006). "Preliminary studies on the inhibition of D-sorbitol-6-phosphate 2-dehydrogenase from Escherichia coli with substrate analogues." J Enzyme Inhib Med Chem 21(2);187-92. PMID: 16791965
Yamada87: Yamada M, Saier MH (1987). "Glucitol-specific enzymes of the phosphotransferase system in Escherichia coli. Nucleotide sequence of the gut operon." J Biol Chem 1987;262(12);5455-63. PMID: 3553176
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