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Transcriptome analysis of B. subtilis cells during recovery from injury after high hydrostatic pressure treatment

ABSTRACT: Transcriptome analysis of B. subtilis cells during recovery from injury after high hydrostatic pressure treatment

PROVIDER: PRJNA521292 | ENA |

REPOSITORIES: ENA

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Transcriptome analysis of B. subtilis cells during recovery from injury after high hydrostatic pressure treatment

Project description:Vegetative cells of B. subtilis can recover from injury caused by high hydrostatic pressure (HHP) treatment at 250 MPa. DNA microarray analysis revealed that many ribosomal genes and translation relating factors (e.g. translation initiation factors) were induced during a growth-arrested phase after the HHP treatment. Expression of cold shock-responsive genes, whose products play key roles for efficient translation, and heat shock-responsive genes, whose product mediates the correct protein folding or degrades misfolded proteins, were also induced. In contrast, the expression of hpf, whose product (Hpf) is involved in ribosome inactivation through dimerization of 70S ribosomes, was repressed. Sucrose density gradient sedimentation analysis showed that ribosomes were dissociated in a pressure-dependent manner and then reconstructed during the growth-arrested phase. These results suggested that the translational machinery can be preferentially reconstructed in the HHP-injured cells. We also found that cell growth after HHP-induced injury was apparently inhibited by Mn2+ or Zn2+ supplemented to the recovery medium. Ribosome reconstruction in HHP-injured cells was significantly delayed in the presence of Mn2+ or Zn2+. Moreover, Zn2+ but not Mn2+ stimulated dimer formation of ribosomes in HHP-injured cells. This Zn2+-dependent accumulation of ribosome dimer was no longer observed in a Δhpf mutant lacking the functional Hpf. Furthermore, the growth recovery of the Δhpf mutant in the Zn2+-supplemented medium was faster than that of the parent strain. Thus, our results indicate that Zn2+ can prevent ribosome reconstruction by stimulating the Hpf-dependent ribosome dimerization, thereby inhibiting the growth recovery of the HHP-injured B. subtilis cells.

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Mouse oocytes: High hydrostatic pressure (HP) treated vs. Control

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Mouse oocytes and in vitro fertilized four-cell stage embryos: High hydrostatic pressure (HP) treated vs. Control

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Adaptation strategies of Pseudothermotoga species to hydrostatic pressure by transcriptional analyses

Project description:Pseudothermotoga elfii strain DSM9442 and P. elfii subsp. lettingae strain TMOT are hyperthermophilic bacteria. P. elfii is a moderate piezophile, isolated from an oil-producing well in Africa at a depth of more than 1600 m. P. lettingae is piezotolerant, isolated from a thermophilic bioreactor fed with methanol as the sole carbon and energy source. In this study, we analysed these bacteria at the genomic and transcriptomic levels. According to the hydrostatic pressure growth conditions the transcriptomic analyses revealed differentially expressed genes emphasizing amino acid and sugars metabolism and transport as the major hydrostatic pressure responding processes. Notably, this work highlights the central role of the amino acid aspartate as key intermediate of the pressure adaptation mechanisms of the deep strain P. elfii DSM 9442. In addition, several differentially expressed genes involved in the membrane and cell wall biosynthesis pathways may be linked to the chain formation morphotype previously described at high pressure for strain P. elfii DSM9442.

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