Functional dissection of Escherichia coli promoters: information in the transcribed region is involved in late steps of the overall process - PubMed (original) (raw)
Functional dissection of Escherichia coli promoters: information in the transcribed region is involved in late steps of the overall process
W Kammerer et al. EMBO J. 1986 Nov.
Abstract
After binding to a promoter Escherichia coli RNA polymerase is in contact with a region of about 70 bp. Around 20 bp of this sequence are transcribed. Information encoded within this transcribed region is involved in late steps of the functional program of a promoter. By changing such 'down-stream' sequences promoter strength in vivo can be varied more than 10-fold. By contrast, information for early steps of the promoter program such as recognition by the enzyme and formation of a stable complex resides in a central core region of about 35 bp. Our data show that the strength of a promoter can be limited at different levels of the overall process. Consequently promoters of identical strength can exhibit different structures due to an alternate optimization of their program.
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