Putative sigma factor SigI (YkoZ) of Bacillus subtilis is induced by heat shock.

@article{Zuber2001PutativeSF,
  title={Putative sigma factor SigI (YkoZ) of Bacillus subtilis is induced by heat shock.},
  author={Ulrich Zuber and Katharina Drzewiecki and Michael Hecker},
  journal={Journal of bacteriology},
  year={2001},
  volume={183 4},
  pages={1472-5}
}
A Bacillus subtilis disruption mutant with a mutation in sigI (formerly ykoZ) shows a temperature-sensitive growth on agar plates. The transcription of the sigI gene is heat shock induced in rich medium but not in minimal medium. Proteome studies revealed a reduced amount of GsiB protein in the sigI mutant under heat shock conditions. 

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Expression of the s-dependent general stress regulon confers multiple stress resistance in Bacillus subtilis

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