Abstract
The present report describes the radioactive labeling of polar lipids in in vitro cultures ofPlasmodium falciparum as well as their extraction with organic solvents and their partial characterization by chemical and enzymatic methods. All substances detected could be cleaved by alkali, suggesting that they were esters rather than sphingolipids or compounds containing alkyl groups. Dolichol-cycle intermediates were not detected. Phosphatidylinositol, phosphatidylethanolamine, and phosphatidylcholine were labeled by fatty acids and inositol or ethanolamine, respectively, confirming their de novo synthesis by the parasite. Metabolic labeling with glucosamine and cleavage by phosphatidylinositol-specific phospholipase C provided evidence of the formation ofN-acetyl-glucosaminylphosphatidylinositol, an obligate precursor in the biosynthesis of glycosylphosphatidylinositol membrane anchors of proteins.
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Abbreviations
- Cho :
-
Choline
- EDTA :
-
ethylenediaminetetraacetic acid
- EGTA :
-
ethyleneglycol-bis-(β-aminoether)-N,N′-tetraacetic acid
- EtN :
-
ethanolamine
- Fuc :
-
fucose
- Gal :
-
galactose
- Glc :
-
glucose
- GlcN :
-
glucosamine
- GlcNAc :
-
N-acetyl glucosamine
- HEPES:
-
N-2-hydroxyethylpiperazinyl-N′-2-ethanesulfonic acid
- HPAEC :
-
high pH anion-exchange chromatography
- Man :
-
mannose
- NP-40:
-
Nonidet P-40
- PI:
-
phosphatidylinositol
- PE :
-
phosphatidylethanolamine
- PCho :
-
phosphatidylcholine
- PMSF :
-
phenylmethylsulfonyl fluoride
- TLC :
-
thin-layer chromatography
- TLCK :
-
tosyllysinechloromethylketone
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This study was supported by grants Schw 296/4-1 and 296/4-2 from the Deutsche Forschungsgemeinschaft, by the British-German Academic Research Collaboration (ARC) Program of the German Academic Exchange Service (DAAD), by the Fonds der Chemischen Industrie, by the Hessisches Ministerium für Wissenschaft und Kunst, and by the P.E. Kempes Foundation, Marburg
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Dieckmann-Schuppert, A., Bender, S., Holder, A.A. et al. Labeling and initial characterization of polar lipids in cultures ofPlasmodium falciparum . Parasitol Res 78, 416–422 (1992). https://doi.org/10.1007/BF00931698
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DOI: https://doi.org/10.1007/BF00931698