Abstract

Two-dimensional electrophoresis technology was used to investigate protein synthesis by the mesophilic bacterium Escherichia coli at low temperature. It was confirmed that protein synthesis in E. coli decreased strongly after a temperature downshift from 37 to 4 degrees C. After incubation for 150 min at 4 degrees C, however, the number of synthesized proteins represented 60% of the overall polypeptide number observed at 37 degrees C. Furthermore, the analysis of autoradiograms revealed the overexpression of 69 proteins by shocked bacteria, showing that the number of cold-induced proteins has been significantly underestimated so far.

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