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Postdivisional synthesis of the Sporosarcina ureae DNA translocase SpoIIIE either in the mother cell or in the prespore enables Bacillus subtilis to translocate DNA from the mother cell to the prespore. | LitMetric

AI Article Synopsis

  • The process of Bacillus subtilis differentiating its vegetative cells into spores involves asymmetric cell division and the role of DNA translocase SpoIIIE, which is critical for moving DNA from the mother cell to the prespore.
  • Researchers tested how changing the timing and location of SpoIIIE synthesis affects spore formation, finding that weaker promoters improved sporulation in a mutant, while a strong prespore-specific promoter did not.
  • The study suggests that the optimal orientation for SpoIIIE assembly relies on slower prespore-specific synthesis, which gets overwhelmed by stronger promoter drives, potentially impacting DNA translocation efficiency.

Article Abstract

The differentiation of vegetative cells of Bacillus subtilis into spores involves asymmetric cell division, which precedes complete chromosome partitioning. The DNA translocase SpoIIIE is required to translocate the origin distal 70% of the chromosome from the larger mother cell into the smaller prespore, the two cells that result from the division. We have tested the effect of altering the time and location of SpoIIIE synthesis on spore formation. We have expressed the spoIIIE homologue from Sporosarcina ureae in B. subtilis under the control of different promoters. Expression from either a weak mother cell-specific (sigma(E)) promoter or a weak prespore-specific (sigma(F)) promoter partly complemented the sporulation defect of a spoIIIE36 mutant; however, expression from a strong prespore-specific (sigma(F)) promoter did not. DNA translocation from the mother cell to the prespore was assayed using spoIIQ-lacZ inserted at thrC; transcription of spoIIQ occurs only in the prespore. Translocation of thrC::spoIIQ-lacZ into the prespore occurred efficiently when spoIIIE(Su) was expressed from the weak sigma(E)- or sigma(F)-controlled promoters but not when it was expressed from the strong sigma(F)-controlled promoter. It is speculated that the mechanism directing SpoIIIE insertion into the septum in the correct orientation may accommodate slow postseptational, prespore-specific SpoIIIE synthesis but may be swamped by strong prespore-specific synthesis.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC142829PMC
http://dx.doi.org/10.1128/JB.185.3.879-886.2003DOI Listing

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