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A pathway leading to the fixation of two molecules of CO2 and the production of one molecule of acetyl-CoA; essentially the oxidative TCA cycle running in reverse. Acetyl-CoA is reductively carboxylated to pyruvate, from which all other central metabolites can be formed. Most of the enzymes of reductive and oxidative TCA cycle are shared, with the exception of three key enzymes that allow the cycle to run in reverse: ATP citrate lyase, 2-oxoglutarate:ferredoxin oxidoreductase, and fumarate reductase. 2-oxoglutarate:ferredoxin oxidoreductase catalyzes the carboxylation of succinyl-CoA to 2-oxoglutarate, ATP citrate lyase the ATP-dependent cleavage of citrate to acetyl-CoA and oxaloacetate, and fumarate reductase the reduction of fumarate forming succinate. An autotrophic carbon dioxide fixation pathway by which two molecules of carbon dioxide are fixed to form glyoxylate. Acetyl coenzyme A (acetyl-CoA) is assumed to be converted to malate, and two CO2 molecules are thereby fixed. Malyl-CoA is thought to be cleaved to acetyl-CoA, the starting molecule, and glyoxylate, the carbon fixation product. The chemical reactions and pathways, including anabolism and catabolism, by which living organisms transform chemical substances. Metabolic processes typically transform small molecules, but also include macromolecular processes such as DNA repair and replication, and protein synthesis and degradation. A metabolic process in which carbon (usually derived from carbon dioxide) is incorporated into organic compounds (usually carbohydrates). A pathway of carbon dioxide fixation in which one molecule of acetyl-CoA is completely synthesized from two molecules of carbon dioxide (CO2). The combination of atmospheric CO2 with a 3-carbon molecule phosphoenol pyruvate (PEP) to make malic acid. The malic acid is then passed into the vacuole where it is stored until daylight, when it is shuttled back out to be used as a substrate in the light reaction of photosynthesis. The combination of atmospheric CO2 with a 3-carbon molecule phosphoenol pyruvate (PEP) in the mesophyll cells to make a 4-carbon acid which is immediately converted to malic acid. The malic acid is then passed across to the bundle sheath cells where it is broken down again to pyruvic acid and CO2. The acid is passed back to the mesophyll cells to be used again, while the CO2 is fed into the reductive pentose-phosphate cycle (Calvin cycle) and converted into sugar and starch. The chemical reactions and pathways involving organic substances, any molecular entities containing carbon. The fixation of carbon dioxide (CO2) as glucose in the chloroplasts of C3 plants; uses ATP and NADPH formed in the light reactions of photosynthesis; carbon dioxide reacts with ribulose 1,5-bisphosphate (catalyzed by the function of ribulose-bisphosphate carboxylase) to yield two molecules of 3-phosphoglycerate; these are then phosphorylated by ATP to 1,3-bisphosphateglyceraldehyde which, in turn, is then reduced by NADPH to glyceraldehyde 3-phosphate. The glyceraldehyde 3-phosphate is converted to fructose 5-phosphate and ribulose 5-phosphate by aldolase and other enzymes; the ribulose 5-phosphate is phosphorylated by ATP to ribulose 1,5-bisphosphate.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: carbon fixation
Acc: GO:0015977
Aspect: Biological Process
Desc: A metabolic process in which carbon (usually derived from carbon dioxide) is incorporated into organic compounds (usually carbohydrates).
Synonyms:
  • autotrophic CO2 fixation pathway
  • autotrophic CO2 fixation
  • autotrophy
Proteins in PDR annotated with:
   This term: 6 [Search]
   Term or descendants: 17 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0015977 - carbon fixation (interactive image map)
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