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Elife. 2017 Oct 13;6. pii: e28560. doi: 10.7554/eLife.28560.

Structure of RNA polymerase bound to ribosomal 30S subunit.

Author information

1
RNA Therapeutics Institute, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, United States.
2
Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, United States.
3
Howard Hughes Medical Institute, New York University School of Medicine, New York, United States.
4
Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States.
#
Contributed equally

Abstract

In bacteria, mRNA transcription and translation are coupled to coordinate optimal gene expression and maintain genome stability. Coupling is thought to involve direct interactions between RNA polymerase (RNAP) and the translational machinery. We present cryo-EM structures of E. coli RNAP core bound to the small ribosomal 30S subunit. The complex is stable under cell-like ionic conditions, consistent with functional interaction between RNAP and the 30S subunit. The RNA exit tunnel of RNAP aligns with the Shine-Dalgarno-binding site of the 30S subunit. Ribosomal protein S1 forms a wall of the tunnel between RNAP and the 30S subunit, consistent with its role in directing mRNAs onto the ribosome. The nucleic-acid-binding cleft of RNAP samples distinct conformations, suggesting different functional states during transcription-translation coupling. The architecture of the 30S•RNAP complex provides a structural basis for co-localization of the transcriptional and translational machineries, and inform future mechanistic studies of coupled transcription and translation.

KEYWORDS:

30S subunit; E. coli; RNA polymerase; biochemistry; biophysics; coupling; cryo-EM; structural biology; transcription; translation

PMID:
29027901
PMCID:
PMC5655137
DOI:
10.7554/eLife.28560
[Indexed for MEDLINE]
Free PMC Article

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