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Escherichia coli fliAZY operon

D S Mytelka1, M J Chamberlin

  • 1Graduate Group in Genetics, University of California, Berkeley 94720, USA.

Journal of Bacteriology
|January 1, 1996
PubMed
Summary
This summary is machine-generated.

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Researchers cloned the Escherichia coli fliAZY operon, identifying novel genes FliZ and FliY. These genes may regulate the sigma F (σF) alternative sigma factor, potentially responding to cell density signals.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • The Escherichia coli fliA gene encodes the alternative sigma factor sigma F (σF), crucial for flagellar gene expression.
  • Understanding the regulation of σF is essential for deciphering bacterial motility and adaptation.

Purpose of the Study:

  • To clone and characterize the Escherichia coli fliAZY operon, including the fliA gene and novel genes fliZ and fliY.
  • To investigate the transcriptional regulation and functional roles of the fliAZY operon components.

Main Methods:

  • Operon cloning and transcriptional mapping using identified start sites.
  • Overexpression and purification of sigma F (σF).
  • In vivo and in vitro expression studies dependent on sigma F (σF).

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Main Results:

  • The fliAZY operon was cloned, containing fliA, fliZ, and fliY.
  • Transcriptional analysis revealed two start sites, with one being sigma F (σF)-dependent.
  • Purified sigma F (σF) demonstrated the ability to direct core polymerase to specific promoters.
  • FliZ and FliY are not essential for motility but may modulate sigma F (σF) activity.

Conclusions:

  • The fliAZY operon is regulated by sigma F (σF) and contains novel regulatory components, FliZ and FliY.
  • FliY, a putative extracellular solute-binding protein, might sense cell density signals to regulate sigma F (σF).
  • This study provides insights into the complex regulatory network governing bacterial gene expression and motility in Escherichia coli.