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Co-transcriptional translation in bacteria involves physical mRNA looping between ribosomes and RNA polymerase (RNAP), facilitated by NusG. This coupling optimizes gene expression by coordinating transcription and translation.

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Area of Science:

  • Molecular Biology
  • Microbial Physiology
  • Biophysics

Background:

  • Transcription and translation are coupled in bacteria, occurring in the same cellular compartment.
  • Previous structural studies provided static snapshots of the ribosome-RNA polymerase (RNAP) complex.
  • The dynamic mechanisms of transcription-translation coupling remain largely unknown.

Purpose of the Study:

  • To reconstitute a complete transcription-translation system for real-time analysis.
  • To investigate the dynamic physical and functional coupling between ribosomes and RNAP.
  • To elucidate the mechanisms of cooperative macromolecular machine function in gene expression.

Main Methods:

  • Reconstitution of an active bacterial transcription-translation system.
  • Multi-color single-molecule fluorescence microscopy.
  • Simultaneous real-time tracking of transcription, translation, and ribosome-RNAP interactions.

Main Results:

  • Physical coupling between ribosomes and RNAP can occur via mRNA looping over long distances, facilitated by NusG.
  • Active transcription elongation occurs during mRNA looping, and ribosomes can rescue paused RNAPs through long-range coupling.
  • Ribosome-RNAP collisions lead to ribosome pausing, offering an alternative mechanism for RNAP rescue.

Conclusions:

  • Dynamic mRNA looping is a key mechanism for physical and functional coupling between transcription and translation.
  • Ribosome-RNAP interactions, including long-range coupling and collisions, play crucial roles in optimizing gene expression.
  • This study provides a dynamic mechanistic view of how macromolecular machines cooperate to regulate gene expression.