Cyclohexane, naphthalene, and diesel fuel increase oxidative stress, CYP153, sodA, and recA gene expression in Rhodococcus erythropolis.

Research paper by Ivan I Sazykin, Maksim M Makarenko, Ludmila L Khmelevtsova, Ekaterina E Seliverstova, Alexander A Rakin, Marina M Sazykina

Indexed on: 10 Dec '19Published on: 24 May '19Published in: MicrobiologyOpen


In this study, we compared the expression of CYP153, sodA, sodC, and recA genes and ROS generation in hydrocarbon-degrading Rhodococcus erythropolis in the presence of cyclohexane, naphthalene, and diesel fuel. The expression of cytochrome P450, sodA (encoding Fe/Mn superoxide dismutase), recA, and superoxide anion radical generation rate increased after the addition of all studied hydrocarbons. The peak of CYP153, sodA, and recA gene expression was registered in the presence of naphthalene. The same substrate upregulated the Cu/Zn superoxide dismutase gene, sodC. Cyclohexane generated the highest level of superoxide anion radical production. Hydrogen peroxide accumulated in the medium enriched with diesel fuel. Taken together, hydrocarbon biotransformation leads to oxidative stress and upregulation of antioxidant enzymes and CYP153 genes, and increases DNA reparation levels in R. erythropolis cells. © 2019 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.