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• W1545991421 abstract "We report the purification and localization of the fadL gene product (FLP), an essential component of the long-chain fatty acid transport machinery in Escherichia coli. FLP was extracted from total membranes by differential extraction with the nonionic detergents Tween 20 and Triton X-100. This protein was further purified from a Tween 20-insoluble-Triton X-100-soluble extract by salt fractionation, gel filtration chromatography, and hydrophobic interaction chromatography. This regime results in a 95-fold purification of FLP from total membranes. The purified protein preparation was homogeneous based on silver staining and gave the characteristic behavior established for the fadL gene product in the presence of sodium dodecyl sulfate at different temperatures prior to sodium dodecyl sulfate-polyacrylamide gel electrophoresis (Mr of 33,000 when heated at 25 degrees C and Mr of 43,000 when heated at 100 degrees C) and on two-dimensional polyacrylamide gels (pI of 4.6 and a Mr of 33,000). Purified FLP was rich in hydrophobic residues accounting for approximately 45% of the total amino acid composition. To localize FLP, antisera were raised against the purified protein and were used to probe differentially fractionated membranes by Western immunoblotting. This procedure demonstrated the presence of this protein only in the outer membrane fraction of fadL+ strains. We confirmed the outer membrane localization of FLP by measuring long-chain fatty acid transport in fadL+ and fadL strains treated with EDTA to alter outer membrane permeability and in spheroplasts generated from fadL+ and fadL strains. Both EDTA-treated cells and spheroplasts transported long-chain fatty acids at essentially the same rate regardless of whether they contained a wild-type or mutant fadL gene. These data imply that FLP is a protein in the outer membrane which is specifically involved in long-chain fatty acid transport." @default.
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• W1545991421 date "1987-01-01" @default.
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• W1545991421 title "Purification and characterization of an outer membrane-bound protein involved in long-chain fatty acid transport in Escherichia coli." @default.
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• W1545991421 doi "https://doi.org/10.1016/s0021-9258(19)75801-3" @default.
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