Structural basis of transcription-translation coupling.
Structural basis of transcription-translation coupling.
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DOI:
10.1126/science.abb5317
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发表时间:
2020-09-11
期刊:
影响因子:
--
通讯作者:
Ebright RH
中科院分区:
文献类型:
--
作者:
Wang C;Molodtsov V;Firlar E;Kaelber JT;Blaha G;Su M;Ebright RH
In bacteria, transcription and translation are coupled processes, in which movement of RNA polymerase (RNAP) synthesizing mRNA is coordinated with movement of the first ribosome translating mRNA. Coupling is modulated by the transcription factors NusG--which is thought to bridge RNAP and ribosome--and NusA. Here, we report cryo-EM 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. Cryo-EM defines states that mediate NusG- and NusA-dependent transcription-translation coupling in bacteria
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