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

K. Asai, K. Ishiwata, K. Matsuzaki, Y. Sadaie
Journal of bacteriology. 2008 190:7 PubMed: 18223082

Abstract: 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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