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By Rodolfo Paoletti, Dr. David Kritchevsky

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Extra resources for Advances in lipid research. / Volume 16

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The dienoic and monoenoic molecules accounted for some 60% and 1 5 % , respectively, of the total phosphatidylcholine in both fractions. No statistically significant difference was found between the distribution of molecular classes, or their fatty acid compositions, when mitochondria were compared with microsomes. The data on fatty acid composition of glycerophospholipids from microsomal and mitochondrial membranes (see Section II,A) also indicate similar complements of phosphatidylethanolamine and phosphatidylinositol species in these organdíes.

Stoffel et al. (1974) have claimed on the basis of 13C nuclear magnetic resonance studies that in human HDL hydrophobic binding of the fatty acid residues of glycerophospholipids to apoproteins takes place, not the ionic interactions of these molecules. On this basis the authors have pro­ posed a model for HDL structure in which the predominantly unsaturated long-chain fatty acyl residues are bound to the apolipoproteins. The work of Kamp et al. , 1976). Radiochemically labeled analogues of phospha­ tidylcholine were synthesized with modifications in the polar and apolar moieties, and the transfer measured between donor and acceptor vesicles.

Metabolism of Diacylglycerophospholipids 25 It should be noted that a specific relationship has been suggested to exist between the bulk phase transformations and the biological functions of glycerophospholipids. , 1971). The temperature of these transitions has been re­ lated in part to the growth of microorganisms and to the state of the fatty acyl chains of membrane glycerophospholipids, which depends upon the fluidity of the fatty acids present. It is now generally accepted that natural cell membranes contain crystalline or gel-state lipids in addition to fluid liquid crystalline domains (Oldfield, 1973; Singer, 1973).

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