ENTRY       ko01200                     Pathway
NAME        Carbon metabolism
DESCRIPTION Carbon metabolism is the most basic aspect of life. This map presents an overall view of central carbon metabolism, where the number of carbons is shown for each compound denoted by a circle, excluding a cofactor (CoA, CoM, THF, or THMPT) that is replaced by an asterisk. The map contains carbon utilization pathways of glycolysis (map00010), pentose phosphate pathway (map00030), and citrate cycle (map00020), and six known carbon fixation pathways (map00710 and map00720) as well as some pathways of methane metabolism (map00680). The six carbon fixation pathways are: (1) reductive pentose phosphate cycle (Calvin cycle) in plants and cyanobacteria that perform oxygenic photosynthesis, (2) reductive citrate cycle in photosynthetic green sulfur bacteria and some chemolithoautotrophs, (3) 3-hydroxypropionate bi-cycle in photosynthetic green nonsulfur bacteria, two variants of 4-hydroxybutyrate pathways in Crenarchaeota called (4) hydroxypropionate-hydroxybutyrate cycle and (5) dicarboxylate-hydroxybutyrate cycle, and (6) reductive acetyl-CoA pathway in methanogenic bacteria.
PATHWAY_MAP ko01200  Carbon metabolism
MODULE      M00001  Glycolysis (Embden-Meyerhof pathway), glucose => pyruvate [PATH:ko01200]
            M00002  Glycolysis, core module involving three-carbon compounds [PATH:ko01200]
            M00004  Pentose phosphate pathway (Pentose phosphate cycle) [PATH:ko01200]
            M00005  PRPP biosynthesis, ribose 5P => PRPP [PATH:ko01200]
            M00006  Pentose phosphate pathway, oxidative phase, glucose 6P => ribulose 5P [PATH:ko01200]
            M00007  Pentose phosphate pathway, non-oxidative phase, fructose 6P => ribose 5P [PATH:ko01200]
            M00008  Entner-Doudoroff pathway, glucose-6P => glyceraldehyde-3P + pyruvate [PATH:ko01200]
            M00009  Citrate cycle (TCA cycle, Krebs cycle) [PATH:ko01200]
            M00010  Citrate cycle, first carbon oxidation, oxaloacetate => 2-oxoglutarate [PATH:ko01200]
            M00011  Citrate cycle, second carbon oxidation, 2-oxoglutarate => oxaloacetate [PATH:ko01200]
            M00012  Glyoxylate cycle [PATH:ko01200]
            M00013  Malonate semialdehyde pathway, propanoyl-CoA => acetyl-CoA [PATH:ko01200]
            M00020  Serine biosynthesis, glycerate-3P => serine [PATH:ko01200]
            M00021  Cysteine biosynthesis, serine => cysteine [PATH:ko01200]
            M00165  Reductive pentose phosphate cycle (Calvin cycle) [PATH:ko01200]
            M00168  CAM (Crassulacean acid metabolism), dark [PATH:ko01200]
            M00169  CAM (Crassulacean acid metabolism), light [PATH:ko01200]
            M00170  C4-dicarboxylic acid cycle, phosphoenolpyruvate carboxykinase type [PATH:ko01200]
            M00171  C4-dicarboxylic acid cycle, NAD - malic enzyme type [PATH:ko01200]
            M00172  C4-dicarboxylic acid cycle, NADP - malic enzyme type [PATH:ko01200]
            M00173  Reductive citrate cycle (Arnon-Buchanan cycle) [PATH:ko01200]
            M00174  Methane oxidation, methanotroph, methane => formaldehyde [PATH:ko01200]
            M00307  Pyruvate oxidation, pyruvate => acetyl-CoA [PATH:ko01200]
            M00308  Semi-phosphorylative Entner-Doudoroff pathway, gluconate => glycerate-3P [PATH:ko01200]
            M00309  Non-phosphorylative Entner-Doudoroff pathway, gluconate/galactonate => glycerate [PATH:ko01200]
            M00344  Formaldehyde assimilation, xylulose monophosphate pathway [PATH:ko01200]
            M00345  Formaldehyde assimilation, ribulose monophosphate pathway [PATH:ko01200]
            M00346  Formaldehyde assimilation, serine pathway [PATH:ko01200]
            M00356  Methanogenesis, methanol => methane [PATH:ko01200]
            M00357  Methanogenesis, acetate => methane [PATH:ko01200]
            M00373  Ethylmalonyl pathway [PATH:ko01200]
            M00374  Dicarboxylate-hydroxybutyrate cycle [PATH:ko01200]
            M00375  Hydroxypropionate-hydroxybutylate cycle [PATH:ko01200]
            M00376  3-Hydroxypropionate bi-cycle [PATH:ko01200]
            M00377  Reductive acetyl-CoA pathway (Wood-Ljungdahl pathway) [PATH:ko01200]
            M00422  Acetyl-CoA pathway, CO2 => acetyl-CoA [PATH:ko01200]
            M00532  Photorespiration [PATH:ko01200]
            M00563  Methanogenesis, methylamine/dimethylamine/trimethylamine => methane [PATH:ko01200]
            M00567  Methanogenesis, CO2 => methane [PATH:ko01200]
            M00579  Phosphate acetyltransferase-acetate kinase pathway, acetyl-CoA => acetate [PATH:ko01200]
            M00580  Pentose phosphate pathway, archaea, fructose 6P => ribose 5P [PATH:ko01200]
            M00620  Incomplete reductive citrate cycle, acetyl-CoA => oxoglutarate [PATH:ko01200]
            M00621  Glycine cleavage system [PATH:ko01200]
            M00633  Semi-phosphorylative Entner-Doudoroff pathway, gluconate/galactonate => glycerate-3P [PATH:ko01200]
            M00740  Methylaspartate cycle [PATH:ko01200]
            M00741  Propanoyl-CoA metabolism, propanoyl-CoA => succinyl-CoA [PATH:ko01200]
            M00982  Methylcitrate cycle [PATH:ko01200]
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