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Overlay of σ4-DNA (coordinates 1KU7) and ArtA–DNA complexes indicating that ArtA binding would prevent σ4 binding to the −35 promoter site. The phosphate backbone of the TGACA DNA sites (−35 site) of the σ4-DNA (wheatish) and ArtA–DNA (light blue) complexes were superimposed. For reference the −35 TGACA site is colored red.
