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NTP-entry routes in multi-subunit RNA polymerases.

Robert Landick1

  • 1Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA. landick@bact.wisc.edu

Trends in Biochemical Sciences
|October 26, 2005
PubMed
Summary

Nucleotide triphosphates (NTPs) reach RNA polymerase active sites through a secondary channel or pre-bound to DNA. This study explores the substrate entry mechanism for multi-subunit RNA polymerases.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Crystal structures of multi-subunit RNA polymerases reveal a deeply buried active site.
  • The mechanism of nucleotide triphosphate (NTP) substrate access to the active site remains a mystery.

Purpose of the Study:

  • To investigate the proposed mechanisms for NTP substrate entry into the RNA polymerase active site.
  • To reconcile conflicting hypotheses regarding NTP substrate translocation.

Main Methods:

  • Analysis of existing crystal structure data.
  • Review of recent literature proposing alternative substrate entry pathways.

Main Results:

  • Two primary hypotheses for NTP entry exist: via a secondary channel or pre-bound to DNA in the main channel.
  • The secondary channel model suggests a direct path for NTPs to the active site.
  • The alternative model proposes NTPs associate with DNA before entering the active site.

Conclusions:

  • The precise route of NTP substrate entry into RNA polymerases is still under active investigation.
  • Understanding substrate access is crucial for comprehending polymerase function and regulation.

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