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Related Experiment Videos

The DNA replication fork can pass RNA polymerase without displacing the nascent transcript

B Liu1, M L Wong, R L Tinker

  • 1Department of Biochemistry & Biophysics, University of California, San Francisco 94143-0448.

Nature
|November 4, 1993
PubMed
Summary

Bacteriophage T4 replication forks can bypass Escherichia coli RNA polymerase during DNA replication. The enzyme retains its transcript, allowing RNA synthesis to resume, indicating an evolutionary adaptation for transcript preservation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA replication and transcription are fundamental cellular processes.
  • Interactions between replication and transcription machinery can pose challenges.
  • Bacteriophage T4 provides a model system for studying DNA replication.

Purpose of the Study:

  • To investigate the in vitro interaction between bacteriophage T4 replication forks and Escherichia coli RNA polymerase.
  • To determine the fate of the RNA polymerase complex and its transcript when encountering a progressing replication fork.

Main Methods:

  • In vitro DNA replication assays using bacteriophage T4 proteins.
  • Biochemical analysis of RNA polymerase complex stability and transcriptional activity post-replication fork passage.

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Main Results:

  • Bacteriophage T4 replication forks successfully passed Escherichia coli RNA polymerase moving in the same direction.
  • The RNA polymerase ternary transcription complex remained bound to DNA, maintaining its transcription bubble.
  • The bypassed RNA polymerase resumed faithful RNA synthesis, indicating transcript retention.

Conclusions:

  • Escherichia coli RNA polymerase has evolved mechanisms to retain its transcript during replication fork passage.
  • This adaptation ensures the integrity of partially synthesized RNA molecules, allowing for completion.
  • The findings shed light on the coordination between DNA replication and transcription in vivo.