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  • FAQ: What are the other sigma factors in E.coli?

    Besides the “housekeeping” sigma factor 70, other sigma factors in E.coli include:
    • σ19 (FecI) - the ferric citrate sigma factor, regulates the fec gene for iron transport. 
    • σ24 (RpoE) - the extracytoplasmic/extreme heat stress sigma factor.
    • σ28 (RpoF) - the flagellar sigma factor.
    • σ32 (RpoH) - the heat shock sigma factor, it is turned on when exposed to heat.
    • σ38 (RpoS) - the starvation/stationary phase sigma factor.
    • σ54 (RpoN) - the nitrogen-limitation sigma factor.