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Nonspecific lipid transfer proteins as probes of membrane structure and function

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Lipids

Abstract

A protein that accelerates transfer of phospholipids of varying head group and fatty acid composition has been purified from bovine liver. As previously found for other phospholipid transfer proteins, “nonspecific lipid transfer protein” stimulates a kinetically biphasic transfer of radioactively labeled phospholipid from small unilamellar vesicles to unlabeled multilamellar vesicles. The kinetics are consistent with rapid transfer of phospholipid from the outer monalyer and slow transfer of that localized in the inner monolayer (half-times greater than 3 days for phosphatidylcholine, phosphatidylethanolamine, and phosphatidylinositol). Protein catalyzed transfer is inhibited by high ionic strength and has an activation energy of 35 kJ/mol. The broad lipid specificity and ease of large-scale purification make these proteins candidates for membrane phospholipid compositional modification. The compositions of rat liver mitochondrial and microsomal membranes and Morris hepatoma 7288c mitochondrial membranes were altered by incubation with lipid vesicles and nonspecific lipid transfer protein. Incubation with phosphatidylcholine vesicles led to increased levels of phosphatidylcholine and decreased levels of other transferrable lipids (phosphatidylethanolamine, phosphatidylinositol, and cholesterol) unless the latter were included in the vesicles. When vesicles containing dipalmitoylphosphatidylcholine were incubated with microsomal membranes, a large increase in disaturated phosphatidylcholine was also observed. These changes in composition were correlated with activities of membrane enzymes. It appears that microsomal glucose-6-phosphatase is inhibited by increased phosphatidylcholine saturation. Moreover, this enzyme is also inhibited by decreases in the phosphatidylethanolamine/phosphatidylcholine ratio whereas NADPH cytochrome c reductase is not. Likewise, decreased cholesterol to phospholipid ratios did not greatly affect the abnormally low levels of hepatoma succinate cytochrome c reductase activity.

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Abbreviations

PdtCho:

phosphatidylcholine

PtdEtn:

phosphatidylethanolamine

PtdIns:

phosphatidylinositol

SphMye:

sphingomyelin

Hepes:

4-(2-hydroxyethyl)-1-piperazineethanesulfonate

NS-TP:

nonspecific lipid transfer protein

diPtdGro:

diphosphatidylglycerol

diPal:

dipalmitoyl

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Authors and Affiliations

  1. The Biological Sciences Group, U-125, The University of Connecticut, 06268, Storrs, CT

    Richard C. Crain

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  1. Richard C. Crain
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Crain, R.C. Nonspecific lipid transfer proteins as probes of membrane structure and function. Lipids 17, 935–943 (1982). https://doi.org/10.1007/BF02534589

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  • DOI: https://doi.org/10.1007/BF02534589

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