Aluminum-tolerant Pseudomonas fluorescens: ROS toxicity and enhanced NADPH production
| Autor: | Sergey Kalyuzhnyi, Jeffrey Middaugh, Vasu D. Appanna, Robert Hamel, Ranji Singh, Daniel Chenier, Robin Beriault |
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| Rok vydání: | 2005 |
| Předmět: |
Pseudomonas fluorescens
Dehydrogenase Cell Count Oxidative phosphorylation Glucosephosphate Dehydrogenase Microbiology Superoxide dismutase chemistry.chemical_compound Menadione Superoxides Glucose-6-phosphate dehydrogenase Glucose-6-Phosphate 1-Dehydrogenase chemistry.chemical_classification Reactive oxygen species biology General Medicine Hydrogen Peroxide biology.organism_classification Lipids Isocitrate Dehydrogenase Biochemistry chemistry biology.protein Molecular Medicine Reactive Oxygen Species Oxidation-Reduction NADP Aluminum |
| Zdroj: | Extremophiles : life under extreme conditions. 9(5) |
| ISSN: | 1431-0651 |
| Popis: | Aluminum (Al) triggered a marked increase in reactive oxygen species (ROS) such as O 2 − and H2O2 in Pseudomonas fluorescens. Although the Al-stressed cells were characterized with higher amounts of oxidized lipids and proteins than controls, NADPH production was markedly increased in these cells. Blue native polyacrylamide gel electrophoresis (BN-PAGE) analyses coupled with activity and Coomassie staining revealed that NADP+ -dependent isocitrate dehydrogenase (ICDH, E.C. 1.1.1.42) and glucose-6-phosphate dehydrogenase (G6PDH, E.C. 1.1.1.49) played a pivotal role in diminishing the oxidative environment promoted by Al. These enzymes were overexpressed in the Al-tolerant microbes and were modulated by the presence of either Al or hydrogen peroxide (H2O2) or menadione. The activity of superoxide dismutase (SOD, E.C. 1.15.1.1), an enzyme known to combat ROS stress was also increased in the cells cultured in millimolar amounts of Al. Hence, Al-tolerant P. fluorescens invokes an anti-oxidative defense strategy in order to survive. |
| Databáze: | OpenAIRE |
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