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dc.contributor.authorGibellini, Federica
dc.contributor.authorHunter, William N.
dc.contributor.authorSmith, Terry K.
dc.identifier.citationGibellini , F , Hunter , W N & Smith , T K 2008 , ' Biochemical characterization of the initial steps of the Kennedy pathway in Trypanosoma brucei : the ethanolamine and choline kinases ' Biochemical Journal , vol 415 , no. 1 , pp. 135-144 . DOI: 10.1042/BJ20080435en
dc.identifier.otherPURE: 601552
dc.identifier.otherPURE UUID: 063259ea-f9e0-443a-887c-f539d2e217f8
dc.identifier.otherWOS: 000259788300014
dc.identifier.otherScopus: 53149096978
dc.descriptionNote related output below contains correction of this paper.en
dc.description.abstractEthanolamine and choline are major components of the trypanosome membrane phospholipids, in the form of GPEtn (glycero-phosphoethanolamine) and GPCho (glycerophosphocholine). Ethanolamine is also found as an integral component of the GPI (glycosylpliosphatidylinositol) anchor that is required for membrane attachment of cell-surface proteins, most notably the variant-surface glycoproteins. The de novo synthesis of GPEtn and GPCho starts with the generation of phosphoethanolamine and phosphocholine by ethanolamine and choline kinases via the Kennedy pathway. Database mining revealed two putative C/EKs (choline/ethanolamine kinases) in the Trypanosoma brucei genome, which were cloned, overexpressed, purified and characterized. TbEK 1 (T brucei ethanolamine kinase 1) was shown to be catalytically active as an ethanolamine-specific kinase, i.e. it had no choline kinase activity. The K values for ethanolamine and ATP were found to be 18.4 +/- 0.9 and 219 29 mu M respectively. TbC/EK2 (T brucei choline/ethanolamine kinase 2), on the other hand, was found to be able to phosphorylate both ethanolamine and choline, even though choline was the preferred substrate, with a K-m 80 times lower than that of ethanolamine. The K. values for choline, ethanolamine and ATP were 31.4 +/- 2.6 mu M, 2.56 +/- 0.31 mu M and 20.6 +/- 1.96 mu M respectively. Further substrate specificity analysis revealed that both TbEK1 and TbC/EK2 were able to tolerate various modifications at the amino group, with the exception of a quaternary amine for TbEK1 (choline) and a primary amine for TbC/EK2 (ethanolamine). Both enzymes recognized analogues with substituents oil C-2, but substitutions oil C-1 and elongations of the carbon chain were not well tolerated.en
dc.relation.ispartofBiochemical Journalen
dc.rights© 2008 The Author(s) The author(s) has paid for this article to be freely available under the terms of the Creative Commons Attribution Non-Commercial Licence ( which permits unrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectCholine kinaseen
dc.subjectEthanolamine kinaseen
dc.subjectKennedy pathwayen
dc.subjectTrypanosoma bruceien
dc.subjectAfrican sleeping sicknessen
dc.subjectDrug targeten
dc.subjectQH301 Biologyen
dc.subjectQD Chemistryen
dc.titleBiochemical characterization of the initial steps of the Kennedy pathway in Trypanosoma brucei : the ethanolamine and choline kinasesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Biomedical Sciences Research Complexen
dc.description.statusPeer revieweden

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