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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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Eukaryotic RNA Polymerases00:58

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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RNA polymerase I: a multifunctional molecular machine.

Jeremy R Haag1, Craig S Pikaard

  • 1Department of Biology, Washington University, 1 Brookings Drive, St. Louis, MO, USA.

Cell
|December 28, 2007
PubMed
Summary
This summary is machine-generated.

Researchers mapped the yeast RNA polymerase I structure using cryo-electron microscopy. This revealed three subunits handle transcription elongation, unlike the transcription factors used by RNA polymerase II.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Yeast RNA polymerase I (Pol I) is crucial for ribosomal RNA synthesis.
  • Understanding the structure of Pol I is key to deciphering its function in transcription.
  • Previous structural data for Pol I was limited, especially regarding its subunit interactions during elongation.

Purpose of the Study:

  • To determine the complete three-dimensional structure of the yeast RNA polymerase I enzyme.
  • To elucidate the roles of specific subunits in transcription elongation.
  • To compare the functional mechanisms of Pol I with the related RNA polymerase II (Pol II) system.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to achieve high-resolution imaging.
  • The study focused on the 14-subunit yeast Pol I enzyme.
  • Image processing and structural modeling were used to reconstruct the enzyme's architecture.

Main Results:

  • The complete structure of the 14-subunit yeast Pol I enzyme was resolved at 12 Å resolution.
  • Three specific subunits within Pol I were identified as performing key roles in transcription elongation.
  • These functions are intrinsically carried out by Pol I subunits, unlike in the Pol II system.

Conclusions:

  • The structure reveals an intrinsic mechanism for transcription elongation within yeast Pol I.
  • This highlights a divergence in functional mechanisms between RNA polymerase I and II systems.
  • The findings provide a structural basis for understanding Pol I-mediated rRNA gene transcription.