Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
권호 표지

Toxic Effects of Catechol and 4-Chlorobenzoate Stresses on Bacterial Cells

  • Park, Sang-Ho (Department of Microbiology and Biotechnology, and Research Institute of Genetic Engineering Chungbuk National University) ;
  • Ko, Yeon-Ja (Department of Microbiology and Biotechnology, and Research Institute of Genetic Engineering Chungbuk National University) ;
  • Kim, Chi-Kyung (Department of Microbiology and Biotechnology, and Research Institute of Genetic Engineering Chungbuk National University)
  • Published : 2001.09.01
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Abstract

Catechol and 4-chlorobenzoate (4CBA) which are produced from the biodegradation of a variety of aromatic and chloroaromatics have been recognized as toxic to living organisms. In this study, the toxic effects of catechol and 4-chlorobenzoate on gram-positive and -negative bacteria were examined in terms of survival, morphology, change in fatty acids and membrane protein composition. The survival rate of the organisms during treatment for 6 h was decreased, as the concentration of each aromatic was increased. Escherichia coli and Pseudomonas cells treated with catechol and 4CBA at concentrations causing a significant decrease in their viability, showed destructive openings in their cell envelopes. Bacills subtilis treated with the aromatics were reduced in cell size and Staphylococcus aureus cells displayed irregular rod shapes with wrinkled surfaces. The bacterial cells treated with 20 mM catechol showed increases in unsaturated fatty acids, but several saturated fatty acids were decreased. In the E. coli cells treated with 20 mM catechol, inner membrane proteins of 150 kDa and 105 kDa were decreased. But several kinds of the inner and outer membrane proteins were increased. In B. subtilis treated with 20 mM catechol, several kinds of proteins were increased or decreased in membrane proteins.

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