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Evaluating two steps in transcription using a fluorescence-based electrophoretic mobility shift assay.

Anoushka Singh1, Ryan C Miller1, Stephen R Archuleta1

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Biochemistry and Molecular Biology Education : a Bimonthly Publication of the International Union of Biochemistry and Molecular Biology
|January 4, 2023
PubMed
Summary
This summary is machine-generated.

This experiment uses a fluorescence-based assay to study bacterial transcription, specifically RNA polymerase binding to DNA and transcriptional activity. Students investigate how the inhibitor rifampicin affects these processes, enhancing their understanding of gene expression and protein-DNA interactions.

Keywords:
EMSARNA polymerasefluorescenceinhibitortranscription

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Transcription is the fundamental process of synthesizing RNA from a DNA template, a crucial step in gene expression.
  • RNA polymerase (RNAP) is the enzyme responsible for transcription, involving DNA binding and RNA synthesis.
  • Understanding RNAP activity and inhibition is key to deciphering gene regulation.

Purpose of the Study:

  • To describe a single laboratory experiment for probing RNAP binding to DNA and transcriptional activity.
  • To utilize a fluorescence-based electrophoretic mobility shift assay (EMSA) for analyzing transcription.
  • To investigate the mechanism of inhibition of transcription by rifampicin.

Main Methods:

  • Employing a fluorescence-based electrophoretic mobility shift assay (EMSA).
  • Using commercially available Escherichia coli RNA polymerase (RNAP).
  • Incorporating the transcriptional inhibitor rifampicin to differentiate its effects on RNAP binding versus activity.

Main Results:

  • The experiment successfully differentiates between RNAP binding to DNA and its transcriptional activity using a single assay.
  • Students can determine whether rifampicin inhibits RNAP binding or catalytic activity.
  • The assay provides a practical method for students to explore transcription inhibition mechanisms.

Conclusions:

  • Students gain a comprehensive understanding of transcription, RNAP function, and inhibition mechanisms.
  • The utility of EMSA in studying protein-DNA interactions is demonstrated.
  • This experimental module offers a flexible platform for inquiry-based learning in molecular biology.