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Mol Cell. 2015 May 7;58(3):534-40. doi: 10.1016/j.molcel.2015.03.010. Epub 2015 Apr 9.

Crystal structures of the E. coli transcription initiation complexes with a complete bubble.

Author information

1
Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA.
2
Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA; Howard Hughes Medical Institute, New Haven, CT 06510, USA; Department of Chemistry, Yale University, New Haven, CT 06520, USA. Electronic address: thomas.steitz@yale.edu.

Abstract

During transcription initiation, RNA polymerase binds to promoter DNA to form an initiation complex containing a DNA bubble and enters into abortive cycles of RNA synthesis before escaping the promoter to transit into the elongation phase for processive RNA synthesis. Here we present the crystal structures of E. coli transcription initiation complexes containing a complete transcription bubble and de novo synthesized RNA oligonucleotides at about 6-Å resolution. The structures show how RNA polymerase recognizes DNA promoters that contain spacers of different lengths and reveal a bridging interaction between the 5'-triphosphate of the nascent RNA and the σ factor that may function to stabilize the short RNA-DNA hybrids during the early stage of transcription initiation. The conformation of the RNA oligonucleotides and the paths of the DNA strands in the complete initiation complexes provide insights into the mechanism that controls both the abortive and productive RNA synthesis.

PMID:
25866247
PMCID:
PMC5567806
DOI:
10.1016/j.molcel.2015.03.010
[Indexed for MEDLINE]
Free PMC Article

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