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A Viable Bacillus subtilis Strain without Functional Extracytoplasmic Function Sigma Genes

Department of Molecular Biology, Faculty of Science, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama City 338-8570, Japan

Received 27 November 2007/ Accepted 10 January 2008

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°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.

Published ahead of print on 25 January 2008.