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- W2024292053 abstract "The biosynthesis of lipid A component was shown to be defective in a temperature-senitive firA mutant of Escherichia coli. Cells were biosynthetically labelled with [14C]acetate and incorporation of radioactivity into the glycerophospholipid compared to lipid A fractions was measured. The lipid A/glycerophospholipid biosynthesis ratio of the firA mutant at 37°C was approximately 50% and at the nonpermissive temperature of 42°C was less than 20% of that observed in the corresponding wild-type strain. Analysis of radiolabelled lipid A 4′-monophosphate derivatives and glycerophospholipids by thin-layer chromatography revealed that the firA mutant at 42°C elaborated an altered lipid A, and its phosphatidylglycerol content was low. The chemical composition of the extracted lipopolysaccharides differed significantly between the firA and the wild-type strain only in the proportion of hexadecanoic acid, which was minimal in the wild type grown at 37°C and 42°C and in firA lipopolysaccharide grown at 37°C. In the firA mutant lipopolysaccharide produced at 42°C, hexadecanoic acid was present in approximately every third molecule, attached to the hydroxyl group of the amide-linked (R)-3-hydroxytetradecanoic acid at the reducing glucosamine of lipid A. Inspection of dephosphorylated free lipid A preparations by laser-desorption mass spectrometry confirmed that significant amounts of heptaacyl lipid A was elaborated by the firA strain grown at 42°C." @default.
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- W2024292053 date "1993-03-01" @default.
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- W2024292053 title "Defective biosynthesis of the lipid A component of temperature-sensitive firA (omsA) Mutant of Escherichia coli" @default.
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- W2024292053 doi "https://doi.org/10.1111/j.1432-1033.1993.tb17670.x" @default.
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