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Transcript cleavage factors from E. coli

S Borukhov1, V Sagitov, A Goldfarb

  • 1Public Health Research Institute, New York, New York 10016.

Cell
|February 12, 1993
PubMed
Summary
This summary is machine-generated.

E. coli transcription elongation factors GreA and GreB cleave nascent RNA in halted complexes, enabling restart. GreB releases longer fragments than GreA, and both factors counteract natural arrest sites.

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Area of Science:

  • Molecular Biology
  • Gene Expression
  • Biochemistry

Background:

  • Transcription elongation is regulated by factors that manage RNA polymerase progression.
  • Specific protein factors, GreA and GreB, are known to interact with transcription complexes.
  • Understanding these factors is crucial for elucidating gene expression control mechanisms.

Purpose of the Study:

  • To isolate and characterize transcription elongation factors GreA and GreB from E. coli.
  • To investigate the transcript cleavage activities of GreA and GreB on halted elongation complexes.
  • To determine the role of GreA and GreB in overcoming natural transcription arrest sites.

Main Methods:

  • Isolation of GreA and GreB proteins from E. coli.
  • In vitro assays with artificially halted transcription elongation complexes.
  • Analysis of transcript cleavage products and resumption of elongation.
  • Testing the effect of GreA and GreB on naturally occurring elongation-arresting sites.

Main Results:

  • Both GreA and GreB induced cleavage of nascent transcripts in halted elongation complexes.
  • GreA cleaved 2-3 nucleotides behind the terminus, while GreB released longer oligonucleotides (up to 9 nt).
  • Both factors antagonized natural elongation-arresting sites, with GreB using transcript cleavage and GreA employing an unknown mechanism.

Conclusions:

  • GreA and GreB are key regulators of transcription elongation in E. coli.
  • Differential cleavage activities of GreA and GreB contribute to managing transcription dynamics.
  • These factors play essential roles in overcoming transcription arrest, ensuring efficient gene expression.