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• W1543999675 abstract "The glycoinositol phospholipid membrane anchor of human erythrocyte acetylcholinesterase (EC 3.1.1.7) contains a novel inositol phospholipid which in this and the accompanying paper (Roberts, W.L., Santikarn, S., Reinhold, V.N., and Rosenberry, T.L. (1988) J. Biol. Chem 263, 18776-18784) is shown to be a plasmanylinositol that is palmitoylated on the inositol ring. The inositol phospholipid was radiolabeled with the photoactivated reagent 3-(trifluoromethyl)-3-(m-[125I] iodophenyl)diazirine and characterized by various chemical and enzymatic cleavage procedures whose products were analyzed by thin layer chromatography and autoradiography or gas chromatography. Acidic methanolysis of human erythrocyte acetylcholinesterase (Ehu AChE) revealed 18:0 and 18:1 alkylglycerols (0.55 and 0.20 mol/mol AChE, respectively). Acetolysis was shown by TLC to release alkylacylglycerol acetates from Ehu AChE. Analysis by gas chromatography revealed that 83% of the alkylacylglycerol acetates contained an 18:0 or 18:1 1-alkyl group and a 22:4 (n - 6), 22:5 (n - 3), or 22:6 (n - 3) 2-acyl group. The inositol phospholipid is linked to the anchor by a glucosamine in glycosidic linkage, and deamination with nitrous acid cleaved the glycosidic linkage and released the phospholipid. The deamination and acetolysis products from Ehu AChE were purified by high performance liquid chromatography, and fatty acid analysis following acidic methanolysis of the purified products revealed that 2 fatty acid residues were associated with the deamination product and only one with the alkylacylglycerol acetolysis product. The other fatty acid residue was primarily palmitate and was indicated to be in ester linkage to an inositol hydroxyl(s). This linkage was shown to be responsible for the resistance of the inositol phospholipid to cleavage by Staphylococcus aureus phosphatidylinositol-specific phospholipase. Deacylation of the inositol phospholipid deamination product by treatment with base removed this palmitoyl group and facilitated release of alkyl- and alkylacylglycerol species by phosphatidylinositol-specific phospholipase C with concomitant formation of inositol 1-phosphate. In contrast, digestion of Ehu AChE with a recently reported anchor-specific phospholipase D resulted in release of plasmanic acids from the intact palmitoylated plasmanylinositol." @default.
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• W1543999675 date "1988-12-01" @default.
• W1543999675 modified "2023-09-27" @default.
• W1543999675 title "Lipid analysis of the glycoinositol phospholipid membrane anchor of human erythrocyte acetylcholinesterase. Palmitoylation of inositol results in resistance to phosphatidylinositol-specific phospholipase C." @default.
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• W1543999675 doi "https://doi.org/10.1016/s0021-9258(18)37349-6" @default.
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