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Solubilization of the Cytoplasmic Membrane of Escherichia coli by the Ionic Detergent Sodium-Lauryl Sarcosinate

¹ Department of Microbiology, The University of Texas at Austin, Austin, Texas 78712

ABSTRACT

The sensitivity of the outer and cytoplasmic membranes of Escherichia coli to detergent was examined by isopycnic sucrose density gradient centrifugation. Sodium lauryl sarcosinate (Sarkosyl) was found to disrupt the cytoplasmic membrane selectively under conditions in which Triton X-100 and dodecyl sodium sulfate solubilized all membrane protein. These results were verified by gel electrophoresis; membrane proteins solubilized by Sarkosyl were identical to those of the cytoplasmic membrane. The presence of Mg²⁺ during treatment with Sarkosyl was found to afford partial protection of the cytoplasmic membrane from dissolution.

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