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Related Experiment Videos

Extended upstream A-T sequence increases T7 promoter strength.

Guo-Qing Tang1, Rajiv P Bandwar, Smita S Patel

  • 1Department of Biochemistry, University of Medicine and Dentistry of New Jersey (UMDNJ) Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA.

The Journal of Biological Chemistry
|October 11, 2005
PubMed
Summary

The AT-rich region upstream of bacteriophage T7 promoters significantly stabilizes T7 RNA polymerase binding. This AT sequence enhances transcription initiation efficiency by influencing promoter affinity and clearance.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Bacteriophage T7 promoters have a consensus sequence (-17 to +6) crucial for transcription.
  • Strong class III promoters feature an extended AT-rich upstream region, unlike weaker class II promoters with GC interruptions.

Purpose of the Study:

  • To investigate the role of the AT-rich region upstream of -17 in T7 RNA polymerase transcription regulation.
  • To understand how this upstream sequence affects polymerase-promoter complex stability and transcription initiation.

Main Methods:

  • Equilibrium DNA binding studies using truncated promoter fragments.
  • Kinetic studies to analyze polymerase-promoter complex association and dissociation rates.
  • Measurement of transcription activity, including abortive synthesis kinetics.

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Main Results:

  • Extended AT-rich sequences upstream of -22 significantly stabilized the polymerase-promoter complex.
  • GC interruptions within the -17 to -22 region resulted in weaker polymerase binding.
  • The AT-rich region modulated abortive RNA synthesis, favoring longer products (9-13 nucleotides).

Conclusions:

  • The AT-rich DNA sequence upstream of -17 plays a critical, previously unappreciated role in T7 transcription.
  • This region modulates transcription efficiency by influencing T7 RNA polymerase promoter affinity and promoter clearance.
  • The AT sequence specificity highlights its importance in regulating gene expression.