Citric acid cycle/ja: Difference between revisions

[[File:Citric acid cycle with aconitate 2.svg|thumb|upright=2|Overview of the citric acid cycle]]

The '''citric acid cycle'''—also known as the '''Krebs cycle''', '''Szent-Györgyi-Krebs cycle''' or the '''TCA cycle (tricarboxylic acid cycle)'''—is a series of [[chemical reaction|biochemical reactions]] to release the energy stored in [[nutrient]]s through the [[Redox|oxidation]] of [[acetyl-CoA]] derived from [[carbohydrate]]s, [[fat]]s, and [[protein]]s. The chemical energy released is available under the form of [[Adenosine triphosphate|ATP]]. The [[Hans Krebs (biochemist)|Krebs]] cycle is used by [[organism]]s that [[Cellular respiration|respire]] (as opposed to organisms that [[Fermentation|ferment]]) to generate energy, either by [[anaerobic respiration]] or [[aerobic respiration]]. In addition, the cycle provides [[precursor (chemistry)|precursors]] of certain [[amino acid]]s, as well as the [[reducing agent]] [[nicotinamide adenine dinucleotide|NADH]], that are used in numerous other reactions. Its central importance to many [[Metabolic pathway|biochemical pathways]] suggests that it was one of the earliest components of [[metabolism]]. Even though it is branded as a 'cycle', it is not necessary for [[metabolite]]s to follow only one specific route; at least three alternative segments of the citric acid cycle have been recognized.