Effect of global transcriptional regulators related to carbohydrate metabolism on organic solvent tolerance in Escherichia coli

2008 ◽  
Vol 105 (4) ◽  
pp. 389-394 ◽  
Author(s):  
Mina Okochi ◽  
Masaki Kurimoto ◽  
Kazunori Shimizu ◽  
Hiroyuki Honda
Keyword(s):  
Escherichia Coli ◽  
Organic Solvent ◽  
Carbohydrate Metabolism ◽  
Transcriptional Regulators ◽  
Solvent Tolerance ◽  
Organic Solvent Tolerance

scholarly journals Involvement of catalase and superoxide dismutase in hydrophobic organic solvent tolerance of Escherichia coli

AMB Express ◽  
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Noriyuki Doukyu ◽  
Katsuya Taguchi
Keyword(s):  
Escherichia Coli ◽  
Organic Solvent ◽  
Organic Solvents ◽  
Double Mutant ◽  
Solvent Tolerance ◽  
Ros Scavenging ◽  
Organic Solvent Tolerance ◽  
E Coli ◽  
Scavenging Enzymes ◽  
Ros Scavenging Enzymes

AbstractEscherichia coli strains are generally sensitive to hydrophobic organic solvents such as n-hexane and cyclohexane. Oxidative stress in E. coli by exposure to these hydrophobic organic solvents has been poorly understood. In the present study, we examined organic solvent tolerance and oxygen radical generation in E. coli mutants deficient in reactive oxygen species (ROS)-scavenging enzymes. The organic solvent tolerances in single gene mutants lacking genes encoding superoxide dismutase (sodA, sodB, and sodC), catalase (katE and katG), and alkyl hydroperoxide reductase (ahpCF) were similar to that of parent strain BW25113. We constructed a BW25113-based katE katG double mutant (BW25113∆katE∆katG) and sodA sodB double mutant (BW25113sodA∆sodB). These double-gene mutants were more sensitive to hydrophobic organic solvents than BW25113. In addition, the intracellular ROS levels in E. coli strains increased by the addition of n-hexane or cyclohexane. The ROS levels in BW25113∆katE∆katG and BW25113∆sodA∆sodB induced by exposure to the solvents were higher than that in BW25113. These results suggested that ROS-scavenging enzymes contribute to the maintenance of organic solvent tolerance in E. coli. In addition, the promoter activities of sodA and sodB were significantly increased by exposure to n-hexane.

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