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- Title
Identification and evaluation of the role of the manganese efflux protein in Deinococcus radiodurans.
- Authors
Hongxing Sun; Guangzhi Xu; Hongdan Zhan; Huan Chen; Zongtao Sun; Bing Tian; Yuejin Hua
- Abstract
Background: Deinococcus radiodurans accumulates high levels of manganese ions, and this is believed to be correlated with the radiation resistance ability of this microorganism. However, the maintenance of manganese ion homeostasis in D. radiodurans remains to be investigated. Results: In this study, we identified the manganese efflux protein (MntE) in D. radiodurans. The null mutant of mntE was more sensitive than the wild-type strain to manganese ions, and the growth of the mntE mutant was delayed in manganese-supplemented media. Furthermore, there was a substantial increase in the in vivo concentration of manganese ions. Consistent with these characteristics, the mntE mutant was more resistant to H2O2, ultraviolet rays, and γ-radiation. The intracellular protein oxidation (carbonylation) level of the mutant strain was remarkably lower than that of the wild-type strain. Conclusions: Our results indicated that dr1236 is indeed a mntE homologue and is indispensable for maintaining manganese homeostasis in D. radiodurans. The data also provide additional evidence for the involvement of intracellular manganese ions in the radiation resistance of D. radiodurans.
- Subjects
DEINOCOCCUS radiodurans; MANGANESE; IONS; RADIATION; HOMEOSTASIS
- Publication
BMC Microbiology, 2010, Vol 10, p319
- ISSN
1471-2180
- Publication type
Article
- DOI
10.1186/1471-2180-10-319