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J Bacteriol. 2008 Apr;190(7):2633-6. doi: 10.1128/JB.01859-07. Epub 2008 Jan 25.

A viable Bacillus subtilis strain without functional extracytoplasmic function sigma genes.

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  • 1Department of Molecular Biology, Faculty of Science, Saitama University, Saitama 338-8570, Japan.


We constructed a Bacillus subtilis Marburg strain that harbors deletion mutations in all seven extracytoplasmic function (ECF) sigma genes. The strain shows wild-type growth at 37 degrees C both in a complex and in a synthetic medium and exhibits wild-type sporulation. ECF sigma genes of B. subtilis are dispensable as long as no stress is imposed, although they seem to be required for quick response to stresses.

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