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Updated: Jun 29, 2025

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Cryo-EM Structure of Porphyromonas gingivalis RNA Polymerase

Fan Bu1, Xiaoxuan Wang2, Mengke Li3

  • 1Section of Transcription & Gene Regulation, The Hormel Institute, University of Minnesota, Austin, MN, USA.

Journal of Molecular Biology
|April 7, 2024
PubMed

Insights

We determined the cryo-EM structure of Porphyromonas gingivalis RNA polymerase (RNAP), revealing unique features. This finding aids in understanding transcription regulation and developing new drugs against this periodontitis pathogen.

Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Porphyromonas gingivalis is a key pathogen in periodontitis and linked to systemic diseases.
  • Rising antibiotic resistance necessitates novel therapeutic strategies.
  • Understanding bacterial RNA polymerase is crucial for developing targeted interventions.

Purpose of the Study:

  • To elucidate the structure of P. gingivalis RNA polymerase (RNAP) using cryo-electron microscopy (cryo-EM).
  • To identify unique structural characteristics of P. gingivalis RNAP compared to other bacterial RNAPs.
  • To provide a structural basis for understanding transcription regulation and drug development.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to determine the high-resolution structure of P. gingivalis RNAP.
  • Structural analysis and comparison with homologous RNAP structures (e.g., E. coli RNAP).

Main Results:

  • A 3.5 Å resolution cryo-EM structure of P. gingivalis RNAP was obtained.
  • Novel structural features were identified in the ω subunit and the β/β' subunits.
  • The ω subunit's potential interaction with the σ4 domain suggests a role in initiation complex stabilization.

Conclusions:

  • The unique structure of P. gingivalis RNAP provides insights into its function in this pathogen.
  • This structural information serves as a foundation for future research on transcription regulation.
  • The findings facilitate structure-based drug development targeting P. gingivalis.
Keywords:
Porphyromonas gingivalisRNA polymerasecryo-electron microscopyperiodontitistranscription

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