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Structural basis of transcription-translation coupling.


ABSTRACT: In bacteria, transcription and translation are coupled processes in which the movement of RNA polymerase (RNAP)-synthesizing messenger RNA (mRNA) is coordinated with the movement of the first ribosome-translating mRNA. Coupling is modulated by the transcription factors NusG (which is thought to bridge RNAP and the ribosome) and NusA. Here, we report cryo-electron microscopy structures of Escherichia coli transcription-translation complexes (TTCs) containing different-length mRNA spacers between RNAP and the ribosome active-center P site. Structures of TTCs containing short spacers show a state incompatible with NusG bridging and NusA binding (TTC-A, previously termed "expressome"). Structures of TTCs containing longer spacers reveal a new state compatible with NusG bridging and NusA binding (TTC-B) and reveal how NusG bridges and NusA binds. We propose that TTC-B mediates NusG- and NusA-dependent transcription-translation coupling.

SUBMITTER: Wang C 

PROVIDER: S-EPMC7566311 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Structural basis of transcription-translation coupling.

Wang Chengyuan C   Molodtsov Vadim V   Firlar Emre E   Kaelber Jason T JT   Blaha Gregor G   Su Min M   Ebright Richard H RH  

Science (New York, N.Y.) 20200820 6509


In bacteria, transcription and translation are coupled processes in which the movement of RNA polymerase (RNAP)-synthesizing messenger RNA (mRNA) is coordinated with the movement of the first ribosome-translating mRNA. Coupling is modulated by the transcription factors NusG (which is thought to bridge RNAP and the ribosome) and NusA. Here, we report cryo-electron microscopy structures of <i>Escherichia coli</i> transcription-translation complexes (TTCs) containing different-length mRNA spacers b  ...[more]

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