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Pathway Description
Fatty Acid Biosynthesis
actinobacillus succinogenes 130Z
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2025-01-13
Last Updated: 2025-01-13
The fatty acid biosynthesis starts from acetyl-CoA reacting either with a holo-[acp] through a 3-oxoacyl-[acp] synthase 3 resulting in an acetyl-[acp] or react with hydrogen carbonate through an ATP driven acetyl-CoA carboxylase resulting in a malonyl-CoA.
Malonyl-CoA reacts with a holo-acp] through a malonyl-CoA-ACP transacylase resulting in a malonyl-[acp]. This compound can react with a KASI protein resulting in an acetyl-[acp]. A malonyl-[acp] can also react with an acetyl-[acp] through KASI and KASII or with acetyl-CoA through a beta-ketoacyl-ACP synthase to produce an acetoacetyl-[acp]. An acetoacetyl-[acp] is also known as a 3-oxoacyl-[acp].
A 3-oxoacyl-[acp] is reduced through a NDPH mediated 3-oxoacyl-[acp] reductase resulting in a (3R)-3-hydroxyacyl-[acp] (R3 hydroxydecanoyl-[acp]) which can either join the fatty acid metabolism, be dehydrated by an 3R-hydroxymyristoyl-[acp] dehydratase to produce a trans-2-enoyl-[acp] or be dehydrated by a hydroxydecanoyl-[acp] to produce a trans-delta2 decenoyl-[acp].
Trans-2-enoyl-[acp] is reduced by a NADH driven enoyl-[acp] reductase resulting in a 2,3,4-saturated fatty acyl-[acp]. This product then reacts with malonyl-[acp] through KASI and KASII resulting in a holo-acyl carrier protein and a 3- oxoacyl-[acp].
Trans-delta2 decenoyl-[acp] reacts with a 3-hydroxydecanoyl-[acp] dehydrase producing a cis-delta 3-decenoyl-ACP. This product then reacts with KASI to produce a 3-oxo-cis-delta5-dodecenoyl-[acp], which in turn is reduced by a NADPH driven 3-oxoacyl-[acp] resulting in a 3R-hydroxy cis delta5-dodecenoyl-acp. This product is dehydrated by a (3R)-hydroxymyristoyl-[acp] dehydratase resulting in a trans-delta 3- cis-delta 5-dodecenoyl-[acp] which in turn is reduced by a NADH driven enoyl-[acp] reductase resulting in a cis-delta5-dodecenoyl-acp which becomes a metabolite of fatty acid metabolism
References
Fatty Acid Biosynthesis References
Li SJ, Cronan JE Jr: The genes encoding the two carboxyltransferase subunits of Escherichia coli acetyl-CoA carboxylase. J Biol Chem. 1992 Aug 25;267(24):16841-7.
Pubmed: 1355089
Yamamoto Y, Miwa Y, Miyoshi K, Furuyama J, Ohmori H: The Escherichia coli ldcC gene encodes another lysine decarboxylase, probably a constitutive enzyme. Genes Genet Syst. 1997 Jun;72(3):167-72.
Pubmed: 9339543
Blattner FR, Plunkett G 3rd, Bloch CA, Perna NT, Burland V, Riley M, Collado-Vides J, Glasner JD, Rode CK, Mayhew GF, Gregor J, Davis NW, Kirkpatrick HA, Goeden MA, Rose DJ, Mau B, Shao Y: The complete genome sequence of Escherichia coli K-12. Science. 1997 Sep 5;277(5331):1453-62. doi: 10.1126/science.277.5331.1453.
Pubmed: 9278503
Bognar AL, Osborne C, Shane B: Primary structure of the Escherichia coli folC gene and its folylpolyglutamate synthetase-dihydrofolate synthetase product and regulation of expression by an upstream gene. J Biol Chem. 1987 Sep 5;262(25):12337-43.
Pubmed: 3040739
Nonet ML, Marvel CC, Tolan DR: The hisT-purF region of the Escherichia coli K-12 chromosome. Identification of additional genes of the hisT and purF operons. J Biol Chem. 1987 Sep 5;262(25):12209-17.
Pubmed: 3040734
Yamamoto Y, Aiba H, Baba T, Hayashi K, Inada T, Isono K, Itoh T, Kimura S, Kitagawa M, Makino K, Miki T, Mitsuhashi N, Mizobuchi K, Mori H, Nakade S, Nakamura Y, Nashimoto H, Oshima T, Oyama S, Saito N, Sampei G, Satoh Y, Sivasundaram S, Tagami H, Horiuchi T, et al.: Construction of a contiguous 874-kb sequence of the Escherichia coli -K12 genome corresponding to 50.0-68.8 min on the linkage map and analysis of its sequence features. DNA Res. 1997 Apr 28;4(2):91-113. doi: 10.1093/dnares/4.2.91.
Pubmed: 9205837
Kondo H, Shiratsuchi K, Yoshimoto T, Masuda T, Kitazono A, Tsuru D, Anai M, Sekiguchi M, Tanabe T: Acetyl-CoA carboxylase from Escherichia coli: gene organization and nucleotide sequence of the biotin carboxylase subunit. Proc Natl Acad Sci U S A. 1991 Nov 1;88(21):9730-3. doi: 10.1073/pnas.88.21.9730.
Pubmed: 1682920
Li SJ, Cronan JE Jr: The gene encoding the biotin carboxylase subunit of Escherichia coli acetyl-CoA carboxylase. J Biol Chem. 1992 Jan 15;267(2):855-63.
Pubmed: 1370469
Muramatsu S, Mizuno T: Nucleotide sequence of the fabE gene and flanking regions containing a bent DNA sequence of Escherichia coli. Nucleic Acids Res. 1989 May 25;17(10):3982. doi: 10.1093/nar/17.10.3982.
Pubmed: 2660106
Alix JH: A rapid procedure for cloning genes from lambda libraries by complementation of E. coli defective mutants: application to the fabE region of the E. coli chromosome. DNA. 1989 Dec;8(10):779-89. doi: 10.1089/dna.1989.8.779.
Pubmed: 2575489
This pathway was propagated using PathWhiz -
Pon, A. et al. Pathways with PathWhiz (2015) Nucleic Acids Res. 43(Web Server issue): W552–W559.
Propagated from SMP0000919
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