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Appl Environ Microbiol. 1992 January; 58(1): 331-334

Unique and overlapping pollutant stress proteins of Escherichia coli.

A Blom, W Harder and A Matin

Department of Biology, TNO Institute of Environmental Sciences, Delft, The Netherlands.

ABSTRACT

Exposure of growing batch cultures of Escherichia coli to nine different "model micropollutants" (benzene, cadmium chloride, chlorpyrivos, 2,4-dichloroaniline, dioctylphtalate, hexachlorobenzene, pentachlorophenol, trichloroethylene, and tetrapropylbenzosulfonate) led to the induction of 13 to 39 proteins, as analyzed by two-dimensional gel electrophoresis. Some of these proteins overlapped with heat shock and carbon starvation proteins, but at least 50% were unique to a given chemical. The stress protein induction showed a temporal pattern, indicating sequential gene expression. Chemical stress protein synthesis occurred even at concentrations that had no effect on growth. Thus, the synthesis of these proteins can be a sensitive index of stress and the nature of environmental pollution.

Appl Environ Microbiol. 1992 January; 58(1): 331-334




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