Lipidomic Analysis of Toxoplasma gondii Reveals Unusual Polar Lipids

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• 作者：Ruth Welti ; Ernie Mui ; Alexis Sparks ; Sarah Wernimont ; Giorgis Isaac ; Michael Kirisits ; Mary Roth ; Craig W. Roberts ; Cyrille Botté ; Eric Maré ; chal ; Rima McLeod
• 刊名：Biochemistry
• 出版年：2007
• 出版时间：December 4, 2007
• 年：2007
• 卷：46
• 期：48
• 页码：13882 - 13890
• 全文大小：183K
• 年卷期：v.46,no.48(December 4, 2007)
• ISSN：1520-4995

文摘

Analysis of the polar lipids of Toxoplasma gondii by electrospray ionization tandem massspectrometry provides a detailed picture of the lipid molecular species of this parasitic protozoan. Mostnotably, T. gondii contains a relatively high level, estimated to about 2% of the total polar lipid, of ceramidephosphoethanolamine. The ceramide phosphoethanolamine has a fatty amide profile with only 16- and18-carbon species. Compared with the host fibroblasts in which it was grown, T. gondii also has higherlevels of phosphatidylcholine but lower levels of sphingomyelin and phosphatidylserine. Analysis at themolecular species level indicated that T. gondii has greater amounts of shorter-chain fatty acid in its polarlipid molecular species than the host fibroblasts. Shorter-chain fatty acids with a combined total of 30 orfewer acyl carbons make up 21% of Toxoplasma's, but only 3% of the host's, diacyl phosphatidylcholine.Furthermore, diacyl phosphatidylcholine with two saturated acyl chains with 12, 14, or 16 carbons makeup over 11% of parasite phosphatidylcholine but less than 3% of the host phosphatidylcholine molecularspecies. The distinctive T. gondii tachyzoite lipid profile may be particularly suited to the function ofparasitic membranes and the interaction of the parasite with the host cell and the host's immune system.Combined with T. gondii genomic data, these lipidomic data will assist in elucidation of metabolic pathwaysfor lipid biosynthesis in this important human pathogen.