大肠杆菌西格玛因子的组成 Sigma factors in E coli: o G(RpoD)-the"housekeeping"sigma factor, transcribes most genes in growing cells Makes the proteins necessary to keep the cell alive. 4(RpoN-the nitrogen-limitation sigma factor (Rpos)-the starvation/stationary phase sigma factor (RpoH)-the heat shock sigma factor, it is turned on when exposed to heat 028(RpoF)-the flagellar sigma factor (RpoE)-the extracytoplasmic/extreme heat stress sigma factor 9(FecI)-the ferric citrate sigma factor, regulates the fec gene for iron transport There are also anti-sigma factors that inhibit the function of sigma factors大肠杆菌西格玛因子的组成 Sigma factors in E.coli:  σ 70 (RpoD) - the "housekeeping" sigma factor, transcribes most genes in growing cells. Makes the proteins necessary to keep the cell alive.  σ 54 (RpoN) - the nitrogen-limitation sigma factor  σ 38 (RpoS) - the starvation/stationary phase sigma factor  σ 32 (RpoH) - the heat shock sigma factor, it is turned on when exposed to heat  σ 28 (RpoF) - the flagellar sigma factor  σ 24 (RpoE) - the extracytoplasmic/extreme heat stress sigma factor  σ 19 (FecI) - the ferric citrate sigma factor, regulates the fec gene for iron transport  There are also anti-sigma factors that inhibit the function of sigma factors