Correlation between temperature range of growth and structural transitions in membranes and lipids of Escherichia coli K12 |
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| Authors: | Andrew S Janoff S Gupte Estelle J Mcgroarty |
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| Institution: | 1. Department of Biophysics, Michigan State University, East Lansing, MI 48824 U.S.A.;2. Department of Pharmacology and Cell Biophysics, University of Cincinnati College of Medicine, Cincinnati, OH 45267 U.S.A. |
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| Abstract: | Purified cytoplasmic and outer membranes isolated from cells of wild-type Escherichia coli grown at different temperatures were labelled with 1,6-diphenyl-1,3,5-hexatriene and anlyzed using fluorescence polarization techniques. Lipids extracted from the membranes were similarly analyzed using fluorescence polarization. The thermotropic structural transition in outer membranes changed as a function of growth temperature. The structural transition in cytoplasmic membranes and lipids extracted from either cytoplasmic or outer membranes did not change with growth temperature. These data suggest that adaptive changes which occur in the outer membrane determine the temperature range of growth of E. coli. These changes apparently require alterations in outer membrane components other than phospholipids. |
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| Keywords: | Fluorescence polarization Structural transition Temperature range Growth limit Hepes To whom reprint requests should be sent |
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