Abstract
The protein composition of the outer membrane of Yersinia pestis grown at 26 and at 37 degrees C was examined. The outer membrane was isolated by isopycnic sucrose density centrifugation, and its degree of purity was determined with known inner and outer membrane components. Using two-dimensional gel electrophoresis, we identified a large number of heat-modifiable proteins in the outer membrane of cells grown at either incubation temperature. One-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis of heated preparations indicated five proteins in the outer membrane of 37 degrees C-grown cells not evident in 26 degrees C-grown cells. Differences in the protein composition of the outer membrane due to the stage of growth were evident at both 26 degrees C and 37 degrees C, although different changes were found at each temperature. When cell envelopes were examined for the presence of peptidoglycan-associated proteins, no differences were seen as a result of stage of growth. Envelopes from 26 degrees C-grown cells yielded two peptidoglycan-associated proteins, E and J. Cells grown at 37 degrees C, however, also contained an additional protein (F) which was not found in either the bound or free form 26 degrees C. The changes in outer membrane protein composition in response to incubation temperature may relate to known nutritional and antigenic changes which occur under the same conditions.
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