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RESEARCH PAPER
Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA
The transcription factor Spo0A is a master regulator for entry into sporulation in the bacterium Bacillus subtilis, but it has been uncertain whether activation of Spo0A is sufficient to trigger development. Spo0A, a member of the response regulator family of gene-control proteins, is activated by phosphorylation via a multicomponent phosphorelay in response to conditions of nutrient limitation. We now report that sporulation can be triggered with high efficiency in cells in the exponential phase of growth in rich medium by artificial induction of the synthesis of any one of three histidine kinases that feed phosphoryl groups into the relay. We further show that the levels of Spo0A protein and activity increase gradually over the first 2 h of sporulation both under conditions of nutrient limitation and in response to induction of kinase synthesis. Evidence indicates that this gradual increase in Spo0A protein and activity plays a critical role in triggering sporulation and requires the action of the phosphorelay.
[Keywords: Bacillus subtilis; sporulation; development; response regulator; transcription; phosphorelay]
Received May 23, 2005; revised version accepted July 11, 2005.
Article and publication are at http://www.genesdev.org/cgi/doi/10.1101/gad.1335705.
1 Corresponding author.
E-MAIL losick{at}mcb.harvard.edu; FAX (617) 496-4642.
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