our results lead us to suggest that a sequence near the c terminus of sigma 70 , which is similar to the helix-turn-helix dna binding motif of phage and bacterial dna binding proteins , is responsible for recognition of the -35 region , and that a sequence internal to sigma 70 , in a region which is highly conserved among sigma factors , recognizes the -10 region of the promoter .
C1148673
dna binding
C0012940
dna