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Acetyl-CoA then enters the citric acid cycle, where the acetyl group is oxidized to carbon dioxide and water, and the energy released is captured in the form of 11 ATP and one GTP per acetyl group. Konrad Bloch and Feodor Lynen were awarded the 1964 Nobel Prize in Physiology or Medicine for their discoveries linking acetyl-CoA and fatty acid ...
ATP + Acetate + CoA → AMP + Pyrophosphate + Acetyl-CoA [1] Once acetyl-CoA is formed it can be used in the TCA cycle in aerobic respiration to produce energy and electron carriers. This is an alternate method to starting the cycle, as the more common way is producing acetyl-CoA from pyruvate through the pyruvate dehydrogenase complex.
Two specific enzymes participate on the carbon monoxide side of the pathway: CO dehydrogenase and acetyl-CoA synthase. The former catalyzes the reduction of the CO 2 and the latter combines the resulting CO with a methyl group to give acetyl-CoA. [2] [1] [3] Some anaerobic bacteria use the Wood–Ljungdahl pathway in reverse to break down acetate.
Acetoacetyl-CoA synthase (EC 2.3.1.194, NphT7) is an enzyme with systematic name acetyl-CoA:malonyl-CoA C-acetyltransferase (decarboxylating). [1] This enzyme catalyses the following chemical reaction
It is created from acetyl-CoA, a thioester, which reacts with the enolate of a second molecule of acetyl-CoA in a Claisen condensation reaction, [2] and it is acted upon by HMG-CoA synthase to form HMG-CoA. [1] During the metabolism of leucine, this last reaction is reversed. Some individuals may experience Acetoacetyl-CoA deficiency. [3]
The acetyl-CoA produced can be used in a variety of ways depending on the needs of the organism. For example, acetate-forming bacteria use acetyl-CoA for their autotrophic growth processes, and methanogenic archae such as Methanocarcina barkeri convert the acetyl-CoA into acetate and use it as an alternative source of carbon instead of CO 2. [5]
Most of the acetate generated in cells for use in acetyl-CoA is synthesized directly from ethanol or pyruvate. [30] However, the artificial triglyceride triacetin (glycerine triacetate) is a common food additive and is found in cosmetics and topical medicines; this additive is metabolized to glycerol and acetic acid in the body. [31]
The mevalonate pathway of eukaryotes, archaea, and eubacteria all begin the same way. The sole carbon feed stock of the pathway is acetyl-CoA. The first step condenses two acetyl-CoA molecules to yield acetoacetyl-CoA. This is followed by a second condensation to form HMG-CoA (3-hydroxy-3- methyl-glutaryl-CoA). Reduction of HMG-CoA yields (R ...