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• W2000287519 abstract "Escherichia coli cells (unsaturated fatty acid auxotroph) have been adapted to grow on branched-chain fatty acids. Membrane vesicles were isolated from cells grown on a mixture of branched-chain fatty acids isolated from the lipids of Bacillus subtilis (E. coli (B. subtilis) membranes) and on a pure synthetic anti-isononadecanoic acid (E. coli (aC19) membranes). We have shown, using wide-angle X-ray diffraction and differential scanning calorimetry, that the ordered state of the lipids is perturbed in the case of E. coli (aC19) membranes. The perturbation leads to the presence of a large wide-angle X-ray diffraction at 4.25–4.3 Å, as opposed to the presence of a sharp 4.2 Å reflection in unperturbed systems. We have shown, using freeze-fracture electron microscopy, that a protein segregation exists in the case of E. coli (aC19) membranes (at low temperature the integral membrane proteins aggregate in the membrane domains containing the disordered lipids); we do not observe such segregation in the case of E. coli (B. subtilis) membranes. We conclude that in cases where the branching of the fatty acids introduces a perturbation of the lipid order, the integral membrane proteins can still be accommodated in membrane domains containing the ‘perturbed’ ordered lipids. Finally, we have determined the rate of β-galactoside transport in E. coli (aC19) and E. coli (B. subtilis) membranes as a function of temperature. We have shown that, in both cases, the Arrhenius representations display an increased slope in the region of the disorder-to-order transition. We conclude that such an increased slope may have different origins. In the case of E. coli (aC19) membranes, it is the result of the aggregation of the β-galactoside carriers together with other integral membrane proteins which may lead to the inactivation of the carriers; in the case of E. coli (B. subtilis) membranes, it is the result of the partial immobilisation of the carriers embedded in a lipid environment, of which the fluidity, despite the perturbation of its lipid order, is still much less than that associated with lipids in a totally disordered state." @default.
• W2000287519 created "2016-06-24" @default.
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• W2000287519 date "1980-11-01" @default.
• W2000287519 modified "2023-09-30" @default.
• W2000287519 title "Influence of lipids with branched-chain fatty acids on the physical, morphological and functional properties of Escherichia coli cytoplasmic membrane" @default.
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• W2000287519 doi "https://doi.org/10.1016/0005-2736(80)90328-4" @default.
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