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20-September-2008 09:55:58 - synthesis Merge arrows It has been suggested that this article or section be merged with lipogenesis. Discuss Category:Ambox templates using deprecated types|Main:Fatty acid synthesisFatty acids are formed by the action of Fatty acid synthases from acetyl-CoA and malonyl-CoA precursors. De Novo Synthesis in Humans In humans fatty acids are predominantly formed in the liver and adipose tissue, and mammary glands during lactation. Most acetyl-CoA is formed from pyruvate by pyruvate dehydrogenase in the mitochondria. Acetyl-CoA produced in the mitochondria is condensed with oxaloacetate to form citrate, which is then transported into the cytosol and broken down to yield acetyl-CoA and oxaloacetate by ATP-citrate lyase. Elongation Much like β-oxidation, elongation occurs via four recurring reactions shown below. In these diagrams, the acetyl and malonyl units are shown as their Acyl carrier protein thioesters: this is how fatty acids are synthesized in microorganisms and plants. However, in animals these same reactions occur on a large dimeric protein, Fatty acid synthase, which has the full complement of enzymatic activities required to synthesize and liberate a free fatty acid. Step Description Diagram Enzyme Condensation The first step is condensation of acetyl ACP and malonyl ACP. This results in the formation of acetoacetyl ACP. Although this reaction is thermodynamically unfavourable, the evolution of CO2 drives the reaction forward. β-Ketoacyl-ACP synthase Reduction of acetoacetyl ACP In this step, acetoacetyl ACP is reduced by NADPH into D-3-Hydroxybutyryl ACP. The double bond is reduced to a hydroxyl group. Only the D isomer is formed. β-Ketoacyl ACP reductase Dehydration In this reaction, D-3-Hydroxybutyryl ACP is dehydrated to crotonyl ACP. 3-Hydroxyacyl ACP dehydrase Reduction of crotonyl ACP During this final step, crotonyl ACP is reduced by NADPH into butyryl ACP. Enoyl ACP reductase In the second step of elongation, butyryl ACP condenses with malonyl ACP to form an acyl ACP compound. This continues until a C16 acyl compound is formed, at which point it is hydrolyzed by a thioesterase into palmitate and ACP. External links Overview at Rensselaer Polytechnic Institute Overview at Indiana State University v d e Lipid metabolism: Lipid metabolism/Fatty acid metabolism Fatty acid degradation Lipolysis, Beta oxidation - Fatty acid synthesis Retrieved from http://en..org/wiki/Fatty_acid_synthesis Categories: All articles to be merged | Metabolism | Fatty acidsHidden category: Articles to be merged since March 2008 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages 日本語 Svenska This page was last modified on 19 May 2008, at 20:1
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