The Bacillus subtilis sigma(X) protein is an extracytoplasmic function sigma factor contributing to survival at high temperature.

@article{Huang1997TheBS,
  title={The Bacillus subtilis sigma(X) protein is an extracytoplasmic function sigma factor contributing to survival at high temperature.},
  author={Xiaosong Huang and A L Decatur and Alexei Sorokin and John D. Helmann},
  journal={Journal of bacteriology},
  year={1997},
  volume={179 9},
  pages={
          2915-21
        }
}
The sigX gene, identified as part of the international effort to sequence the Bacillus subtilis genome, has been proposed to encode an alternative sigma factor of the extracytoplasmic function (ECF) subfamily. The sigX gene is cotranscribed with a downstream gene, ypuN, during logarithmic and early stationary phases of growth. We now report that strains lacking sigma(X) are impaired in the ability to survive at high temperature whereas a ypuN mutant has increased thermotolerance. We… CONTINUE READING
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