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- W2020244222 abstract "In studies using Escherichia coli we have shown that new protein species appear in the outer membrane fraction with concomitant losses of nascent proteins from the soluble and inner membrane fractions following heat exposure. Of the various explanations for this phenomenon, temperature-induced membrane disorganization appeared the most likely. It is suggested that heat mimics the action of the signal sequence of a protein on the lipid bilayer allowing non-signal-sequence-containing proteins to be translocated. To test this hypothesis we grew E. coli K1060 cells, an unsaturated fatty acid requiring auxotroph, supplemented during growth with fatty acids of varying chain length in an attempt to determine whether biological membranes of varying ability to maintain their bilayer configuration could be constructed. The rationale being that such membranes would allow us to determine whether differences in translocation would occur in cells grown at the same temperature supplemented with either 16:1 or 20:1 unsaturated fatty acids when the cells were subjected to a series of thermal insults. Protein translocation occurred to a greater extent and at lower temperatures in cells supplemented with the longer chain fatty acid. Treatment of outer membranes with either 1 M salt, 6 M urea or high pH and studies determining fluorescent polarization values by scanning up and down through a series of temperatures ranging from 15 to 49 degrees C indicate that the proteins translocated by heat to the outer membrane are integral. Protein translocation may represent an adaptive response to an altered environment enabling the cell to respond to stress by stabilizing its outer membrane." @default.
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- W2020244222 date "1987-07-01" @default.
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- W2020244222 title "Influence of membrane-lipid composition on translocation of nascent proteins in heated Escherichia coli" @default.
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- W2020244222 doi "https://doi.org/10.1016/0005-2736(87)90266-5" @default.
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