Phosphatidylethanolamine in Trypanosoma brucei is organized in two separate pools and is synthesized exclusively by the Kennedy pathway

Signorell, Aita; Rauch, Monika; Jelk, Jennifer; Ferguson, Michael A J; Bütikofer, Peter (2008). Phosphatidylethanolamine in Trypanosoma brucei is organized in two separate pools and is synthesized exclusively by the Kennedy pathway. Journal of biological chemistry, 283(35), pp. 23636-44. Bethesda, Md.: American Society for Biochemistry and Molecular Biology 10.1074/jbc.M803600200

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Phosphatidylethanolamine is a major phospholipid class of all eukaryotic cells. It can be synthesized via the CDP-ethanolamine branch of the Kennedy pathway, by decarboxylation of phosphatidylserine, or by base exchange with phosphatidylserine. The contributions of these pathways to total phosphatidylethanolamine synthesis have remained unclear. Although Trypanosoma brucei, the causative agent of human and animal trypanosomiasis, has served as a model organism to elucidate the entire reaction sequence for glycosylphosphatidylinositol biosynthesis, the pathways for the synthesis of the major phospholipid classes have received little attention. We now show that disruption of the CDP-ethanolamine branch of the Kennedy pathway using RNA interference results in dramatic changes in phosphatidylethanolamine, phosphatidylserine, and phosphatidylcholine. By targeting individual enzymes of the pathway, we demonstrate that de novo phosphatidylethanolamine synthesis in T. brucei procyclic forms is strictly dependent on the CDP-ethanolamine route. Interestingly, the last step in the Kennedy pathway can be mediated by two separate activities leading to two distinct pools of phosphatidylethanolamine, consisting of predominantly alk-1-enyl-acyl- or diacyl-type molecular species. In addition, we show that phosphatidylserine in T. brucei procyclic forms is synthesized exclusively by base exchange with phosphatidylethanolamine.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Biochemistry and Molecular Medicine
UniBE Contributor:	Bütikofer, Peter
ISSN:	0021-9258
ISBN:	18587155
Publisher:	American Society for Biochemistry and Molecular Biology
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:03
Last Modified:	05 Dec 2022 14:19
Publisher DOI:	10.1074/jbc.M803600200
PubMed ID:	18587155
Web of Science ID:	000258638900016
URI:	https://boris.unibe.ch/id/eprint/27319 (FactScience: 106022)