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• W1999332954 abstract "The human malaria parasite Plasmodium falciparum harbors a relict, nonphotosynthetic plastid of algal origin termed the apicoplast. Although considerable progress has been made in defining the metabolic functions of the apicoplast, information on the composition and biogenesis of the four delimiting membranes of this organelle is limited. Here, we report an efficient method for preparing highly purified apicoplasts from red blood cell parasite stages and the comprehensive lipidomic analysis of this organelle. Apicoplasts were prepared from transgenic parasites expressing an epitope-tagged triosephosphate transporter and immunopurified on magnetic beads. Gas and liquid chromatography MS analyses of isolated apicoplast lipids indicated significant differences compared with total parasite lipids. In particular, apicoplasts were highly enriched in phosphatidylinositol, consistent with a suggested role for phosphoinositides in targeting membrane vesicles to apicoplasts. Apicoplast phosphatidylinositol and other phospholipids were also enriched in saturated fatty acids, which could reflect limited acyl exchange with other membrane phospholipids and/or a requirement for specific physical properties. Lipids atypical for plastids (sphingomyelins, ceramides, and cholesterol) were detected in apicoplasts. The presence of cholesterol in apicoplast membranes was supported by filipin staining of isolated apicoplasts. Galactoglycerolipids, dominant in plant and algal plastids, were not detected in P. falciparum apicoplasts, suggesting that these glycolipids are a hallmark of photosynthetic plastids and were lost when these organisms assumed a parasitic lifestyle. Apicoplasts thus contain an atypical melange of lipids scavenged from the human host alongside lipids remodeled by the parasite cytoplasm, and stable isotope labeling shows some apicoplast lipids are generated de novo by the organelle itself." @default.
• W1999332954 created "2016-06-24" @default.
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• W1999332954 date "2013-04-15" @default.
• W1999332954 modified "2023-10-13" @default.
• W1999332954 title "Atypical lipid composition in the purified relict plastid (apicoplast) of malaria parasites" @default.
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• W1999332954 doi "https://doi.org/10.1073/pnas.1301251110" @default.
• W1999332954 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3645554" @default.
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• W1999332954 hasPublicationYear "2013" @default.
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