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Related Experiment Videos

NTP-driven translocation by human RNA polymerase II.

Yuri A Nedialkov1, Xue Q Gong, Stacy L Hovde

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824-1319, Japan.

The Journal of Biological Chemistry
|March 15, 2003
PubMed
Summary

Researchers developed a "running start, two-bond" protocol to study human RNA polymerase II (RNAP II) elongation. This method reveals NTP-driven translocation and identifies key steps in the RNAP II mechanism.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNA polymerase II (RNAP II) is crucial for gene transcription in eukaryotes.
  • Understanding the dynamics of RNAP II elongation is essential for deciphering gene regulation.

Purpose of the Study:

  • To develop and apply a novel method for analyzing the rapid rates of human RNAP II elongation.
  • To gain detailed mechanistic insights into the steps of RNAP II-mediated transcription.

Main Methods:

  • A "running start, two-bond" protocol was employed to analyze RNAP II elongation.
  • The method involves briefly stalling RNAP II before adding the next nucleotide triphosphate (NTP).
  • Tracking two-bond formation ensured analysis of at least one translocation event.

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Main Results:

  • Slow reaction steps, both before and after phosphodiester bond synthesis, were identified.
  • These steps exhibit significant dependence on the incoming templated NTP.
  • Translocation and pyrophosphate release are differentially regulated by elongation factors, including hepatitis delta antigen and transcription factor IIF.

Conclusions:

  • Translocation during RNAP II elongation can be driven by the incoming substrate NTP.
  • This finding aligns with the established structure of the RNAP II elongation complex.
  • The study elucidates the NTP-dependent nature of RNAP II pausing and processive translocation.