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Pathway Description
Phosphatidylethanolamine Biosynthesis PE(18:1(9Z)/22:2(13Z,16Z))
Mus musculus
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2018-08-02
Last Updated: 2023-10-01
Phosphatidylethanolamines (PE) are a class of phospholipids that incorporate a phosphoric acid headgroup into a diacylglycerol backbone. They are the second most abundant phospholipid in eukaryotic cell membranes, and contrary to phosphatidylcholine, it is concentrated with phosphatidylserine in the cell membrane's inner leaflet. In the visualization, all enzymes that are dark green in colour are membrane-localized. The first pathway synthesizes phosphatidylethanolamine from ethanolamine via the Kennedy pathway. First, the cytosol-localized enzyme choline/ethanolamine kinase catalyzes the conversion of choline into phosphocholine. Second, choline-phosphate cytidylyltransferase, localized to the endoplasmic reticulum membrane, catalyzes the conversion of phosphocholine to CDP-choline. Last, choline/ethanolaminephosphotransferase catalyzes phosphatidylcholine biosynthesis from CDP-choline. It requires either magnesium or manganese ions as cofactors. Phosphatidylethanolamine is also synthesized from phosphatidylserine at the mitochondrial inner membrane by phosphatidylserine decarboxylase. Phosphatidylserine, itself, is synthesized using a base-exchange reaction with phosphatidylcholine. This reaction is catalyzed by phosphatidylserine synthase which is located in the endoplasmic reticulum membrane.
References
Phosphatidylethanolamine Biosynthesis PE(18:1(9Z)/22:2(13Z,16Z)) References
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Pubmed: 10432300
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Zborowski J, Dygas A, Wojtczak L: Phosphatidylserine decarboxylase is located on the external side of the inner mitochondrial membrane. FEBS Lett. 1983 Jun 27;157(1):179-82. doi: 10.1016/0014-5793(83)81141-7.
Pubmed: 6862014
Okazaki N, Kikuno R, Ohara R, Inamoto S, Aizawa H, Yuasa S, Nakajima D, Nagase T, Ohara O, Koga H: Prediction of the coding sequences of mouse homologues of KIAA gene: II. The complete nucleotide sequences of 400 mouse KIAA-homologous cDNAs identified by screening of terminal sequences of cDNA clones randomly sampled from size-fractionated libraries. DNA Res. 2003 Feb 28;10(1):35-48. doi: 10.1093/dnares/10.1.35.
Pubmed: 12693553
This pathway was generated using PathWhiz -
Pon, A. et al. Pathways with PathWhiz (2015) Nucleic Acids Res. 43(Web Server issue): W552–W559.
Generated from SMP0063697
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 SMP0015280
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