Download MendeleyStructural basis of transcription-translation coupling.
Wang, C., Molodtsov, V., Firlar, E., Kaelber, J.T., Blaha, G., Su, M., Ebright, R.H.(2020) Science 369: 1359-1365
- PubMed: 32820061 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1126/science.abb5317
- Primary Citation Related Structures:
6VU3, 6VYQ, 6VYR, 6VYS, 6VYT, 6VYU, 6VYW, 6VYX, 6VYY, 6VYZ, 6VZ2, 6VZ3, 6VZ5, 6VZ7, 6VZJ, 6X6T, 6X7F, 6X7K, 6X9Q, 6XDQ, 6XDR, 6XGF, 6XII, 6XIJ - PubMed 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.
- Waksman Institute and Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA.
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