Septation, dephosphorylation, and the activation of sigma(super.F) during sporulation in Bacillus subtilis

Article Abstract:

Dephosphorylation, septation, and the activation of the transcription factor sigma(super.F) have been studied as they occur in Bacillus subtilis sporulation. Cell-specific activation of the transcription factor in sporulation in S. subtilis must have formation of the polar septum and activity of a serine phosphatase (SpoIIE) in the septum. It has been shown that SpoIIE is in the predivisional sporangium through use of a SpoIIE-GFP fusion protein in time-lapse and time-course experiments and by direct visualization of septa in living cells. Finding are not compatible with a model for control of sigma(super.F) action in which the phosphatase is just kept to one cell. The function of SpoIIE is regulated and there is evidence the regulation is two-stage. SpoIIE blocks capacity of unphosphorylated SpoIIAA to activate sigma(super.F) until formation of the polar septum is done.

France, Genetic research

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Developmental commitment in a bacterium

Article Abstract:

The developmental commitment during sporulation in Bacillus subtilis that is initiated by nutrient limitation and involves division of the developing cell into two progeny, the forespore and the mother cell with different fates, is investigated. The developmental commitment of the single-celled organism, like that of the cells of complex, multicelluar organisms, ensures that differentiation is maintained despite changes in the extracellular milieu.

Science & research, Cell division

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Differential gene expression governed by chromosomal spatial asymmetry

Article Abstract:

Research suggests that the cell-specific gene activation involving the spatial asymmetry of a chromosome translation into the asymmetric distribution of an unstable regulatory protein occurs via a novel mechanism. Data indicate that sigma(sup)F transcription factor regulates the forespore function during sporulation in Bacillus subtilis.

Statistical Data Included, Analysis, Gene expression

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