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Immunofluorescence microscopy was used to study the establishment of compartment-specific transcription during sporulation in Bacillus subtilis. Analysis of the distribution of the anti-anti-sigma factor, SpoIIAA, in a variety of mutant backgrounds supports a model in which the SpoIIE phosphatase, which activates SpoIIAA by dephosphorylation, is sequestered onto the prespore face of the asymmetric septum. Thus, prespore-specific gene expression apparently arises as a result of the compartmentalization of SpoIIE protein. The results also suggest the existence of at least two compartment-specific programs of proteolysis, one dependent on the mother cell-specific sigma factor sigma E and the other dependent on the prespore-specific sigma factor sigma F.

journal of bacteriology

Establishment of Prespore-Specific Gene Expression in <i>Bacillus subtilis</i> : Localization of SpoIIE Phosphatase and Initiation of Compartment-Specific Proteolysis

Establishment of Prespore-Specific Gene Expression in Bacillus subtilis : Localization of SpoIIE Phosphatase and Initiation of Compartment-Specific Proteolysis