Transcription

σ70 binds both the –35 and –10 sequences.
The crystal structure of a sigma factor fragment from the
bacterium Thermus aquaticus shows that these regions fold into
three independent domains in the protein:
domain σ2 contains 1.2-2.4, σ3 contains 3.0-1.3, and σ4 contains
4.1-4.2
B-22