Journal
CURRENT OPINION IN MICROBIOLOGY
Volume 4, Issue 2, Pages 126-131Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/S1369-5274(00)00177-6
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It is clear that multiple sites of interaction exist between sigmas and core subunits, likely reflecting the changing pattern of interactions that occur sequentially during the complex process of holoenzyme formation, open promoter formation, and initiation of transcription. Recent studies have revealed that a major site of interaction of Escherichia coli sigma factors is the amino acid 260-309 coiled-coil region of the beta ' subunit of core RNA polymerase. This region of beta ' interacts with region 2.1-2.2 of sigma (70), Binding of this region of beta ' to sigma (70) triggers a conformational change in sigma that allows it to bind to a -10 nontemplate promoter DNA strand oligonucleotide.
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