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sigma factor
This HMM hits a core region shared by multiple sigma factors, interchangeable subunits that complete the RNA polymerase holoenzyme and allow transcription to start. In E. coli K-12 alone, this HMM hits RpoD (sigma-70), RpoH (sigma-32), FliA (sigma-28), FecI (sigma-19), RpoS, and RpoE.
sigma-70 family RNA polymerase sigma factor
sigma-70 family RNA polymerase sigma factor is a general transcription factor that reversibly binds RNA polymerase and mediates transcription.
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