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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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Published on: November 12, 2012

Regulatory circuits controlling enterococcal conjugation: lessons for functional genomics.

Gary M Dunny1, Christopher M Johnson

  • 1Department of Microbiology, University of Minnesota, 420 Delaware St. SE, Minneapolis, MN 55455, USA. dunny001@umn.edu

Current Opinion in Microbiology
|March 1, 2011
PubMed
Summary
This summary is machine-generated.

The pheromone system in Enterococcus faecalis uses a receptor protein and signaling molecules to regulate gene expression. This complex regulatory network, involving post-transcriptional control, offers insights into bacterial genetics.

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Area of Science:

  • Microbiology
  • Bacterial Genetics
  • Molecular Biology

Background:

  • The pheromone-inducible plasmid transfer system in Enterococcus faecalis is a well-characterized genetic regulatory mechanism.
  • This system involves a pheromone receptor/repressor protein that controls transcription initiation.
  • The receptor's activity is modulated by two competing peptide signaling molecules with opposing effects.

Purpose of the Study:

  • To elucidate the multilayered regulatory circuitry governing pheromone-induced plasmid transfer in Enterococcus faecalis.
  • To explore how post-transcriptional regulation contributes to the system's function as a biological switch.
  • To establish the pheromone system as a model for comprehensive functional genomic analysis in E. faecalis.

Main Methods:

  • Analysis of transcriptional regulation.
  • Investigation of protein-ligand interactions.
  • Study of post-transcriptional regulatory mechanisms.
  • Functional genomic analysis.

Main Results:

  • Transcription initiation is precisely controlled by a pheromone receptor/repressor protein.
  • Two distinct peptide signaling molecules compete for the receptor's binding site, exerting opposing regulatory effects.
  • Robust biological switch function necessitates multiple layers of post-transcriptional regulation.
  • Enterococcal core genome gene expression may also involve complex regulatory circuits.

Conclusions:

  • The pheromone-inducible system in E. faecalis exhibits sophisticated multilayered regulation.
  • Post-transcriptional control is crucial for the sensitivity and robustness of this genetic switch.
  • This system serves as a valuable paradigm for advancing functional genomic studies in Enterococcus faecalis.