Single-cell measurement of the levels and distributions of the phosphorelay components in a population of sporulating Bacillus subtilis cells

Upon nutrient starvation, the Gram-positive bacterium Bacillus subtilis switches from growth to sporulation by activating a multicomponent phosphorelay consisting of a major sensor histidine kinase (KinA), two phosphotransferases (Spo0F and Spo0B) and a response regulator (Spo0A). Although the prima...

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Bibliographic Details
Published in:Microbiology (Society for General Microbiology) 2010-08, Vol.156 (Pt 8), p.2294-2304
Main Authors: Eswaramoorthy, Prahathees, Dinh, Jeffrey, Duan, Daniel, Igoshin, Oleg A, Fujita, Masaya
Format: Article
Language:English
Subjects:
Bacillus subtilis
Bacillus subtilis - physiology
Bacterial Proteins - metabolism
Gene Expression Profiling
Gene Expression Regulation, Bacterial
Phosphotransferases - metabolism
Protein Kinases - metabolism
Spores, Bacterial - physiology
Transcription Factors - metabolism
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Summary:Upon nutrient starvation, the Gram-positive bacterium Bacillus subtilis switches from growth to sporulation by activating a multicomponent phosphorelay consisting of a major sensor histidine kinase (KinA), two phosphotransferases (Spo0F and Spo0B) and a response regulator (Spo0A). Although the primary sporulation signal(s) produced under starvation conditions is not known, it is believed that the reception of a signal(s) on the sensor kinase results in the activation of autophosphorylation of the enzyme. The phosphorylated kinase transfers the phosphate group to Spo0A via the phosphorelay and thus triggers sporulation. With a combination of quantitative immunoblot analysis, microscopy imaging and computational analysis, here we found that each of the phosphorelay components tested increased gradually over the period of sporulation, and that Spo0F was expressed in a more heterogeneous pattern than KinA and Spo0B in a sporulating cell population. We determined molecule numbers and concentrations of each phosphorelay component under physiological sporulation conditions at the single-cell level. Based on these results, we suggest that successful entry into the sporulation state is manifested by a certain critical level of each phosphorelay component, and thus that only a subpopulation achieves a sufficient intracellular quorum of the phosphorelay components to activate Spo0A and proceed successfully to the entry into sporulation.
ISSN:1350-0872
1465-2080
DOI:10.1099/mic.0.038497-0