Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Identification and Functional Analysis of RelA/SpoT Homolog (RSH) Genes in Deinococcus radiodurans

  • Wang, Jinhui (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences) ;
  • Tian, Ye (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences) ;
  • Zhou, Zhengfu (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences) ;
  • Zhang, Liwen (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences) ;
  • Zhang, Wei (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences) ;
  • Lin, Min (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences) ;
  • Chen, Ming (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences)
  • Received : 2016.01.11
  • Accepted : 2016.08.10
  • Published : 2016.12.28
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Abstract

To identify the global effects of (p)ppGpp in the gram-positive bacterium Deinococcus radiodurans, which exhibits remarkable resistance to radiation and other stresses, RelA/SpoT homolog (RSHs) mutants were constructed by direct deletion mutagenesis. The results showed that RelA has both synthesis and hydrolysis domains of (p)ppGpp, whereas RelQ only synthesizes (p)ppGpp in D. radiodurans. The growth assay for mutants and complementation analysis revealed that deletion of relA and relQ sensitized the cells to $H_2O_2$, heat shock, and amino acid limitation. Comparative proteomic analysis revealed that the bifunctional RelA is involved in DNA repair, molecular chaperone functions, transcription, the tricarboxylic acid cycle, and metabolism, suggesting that relA maintains the cellular (p)ppGpp levels and plays a crucial role in oxidative resistance in D. radiodurans. The D. radiodurans relA and relQ genes are responsible for (p)ppGpp synthesis/hydrolysis and (p)ppGpp hydrolysis, respectively. (p)ppGpp integrates a general stress response with a targeted re-programming of gene regulation to allow bacteria to respond appropriately towards heat shock, oxidative stress, and starvation. This is the first identification of RelA and RelQ involvement in response to oxidative, heat shock, and starvation stresses in D. radiodurans, which further elucidates the remarkable resistance of this bacterium to stresses.

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