| Title | PprM is necessary for up-regulation of katE1, encoding the major catalase of Deinococcus radiodurans, under unstressed culture conditions |
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| Author | Sun-Wook Jeong1,2, Ho Seong Seo1, Min-Kyu Kim1, Jong-Il Choi3, Heon-Man Lim2, and Sangyong Lim1* |
| Address | 1Research Division for Biotechnology, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea, 2Department of Biological Sciences, College of Biological Sciences and Biotechnology, Chungnam National University, Daejeon 34134, Republic of Korea, 3Department of Biotechnology and Bioengineering, Chonnam National University, Gwangju 61186, Republic of Korea |
| Bibliography | Journal of Microbiology, 54(6),426-431, 2016, |
| DOI | 10.1007/s12275-016-6175-8 |
| Key Words | PprM, cold-shock protein, ROS, katE1, catalase activity |
| Abstract | Deinococcus radiodurans is a poly-extremophilic organism, capable of tolerating a wide variety of different stresses, such as gamma/ultraviolet radiation, desiccation, and oxidative stress. PprM, a cold shock protein homolog, is involved in the radiation resistance of D. radiodurans, but its role in the oxidative stress response has not been investigated. In this study, we investigated the effect of pprM mutation on catalase gene expression. pprM disruption decreased the mRNA and protein levels of KatE1, which is the major catalase in D. radiodurans, under normal culture conditions. A pprM mutant strain (pprMMT) exhibited decreased catalase activity, and its resistance to hydrogen peroxide (H2O2) decreased accordingly compared with that of the wild-type strain. We confirmed that RecG helicase negatively regulates katE1 under normal culture conditions. Among katE1 transcriptional regulators, the positive regulator drRRA was not altered in pprM-, while the negative regulators perR, dtxR, and recG were activated more than 2.5-fold in pprMMT. These findings suggest that PprM is necessary for KatE1 production under normal culture conditions by down-regulation of katE1 negative regulators. |