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A Thermosensitive, Phase-Variable Epigenetic Switch: pap Revisited.

Mario Zamora1,2, Christine A Ziegler3, Lydia Freddolino3,4

  • 1Stritch School of Medicine, Health Sciences Division, Loyola University Chicago, Maywood, Illinois, USA.

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|July 31, 2020
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Summary
This summary is machine-generated.

This review updates our understanding of the pyelonephritis-associated pilus (pap) genetic switch in uropathogenic bacteria. It integrates new findings on regulatory factors and DNA interactions to present a revised model of pap expression control.

Keywords:
acetylationbacteriaepigeneticsgene silencinggenetic modelshistonenucleoid-associated proteinphase variationpiliprotein acetylationtemperaturetranscription

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • The pyelonephritis-associated pilus (pap) genetic switch controls virulence in uropathogenic bacteria.
  • A decade has passed since the last comprehensive review of this complex regulatory system.

Purpose of the Study:

  • To synthesize recent advances in understanding pap gene regulation.
  • To integrate new data with existing knowledge to propose a revised model of the pap regulatory network.

Main Methods:

  • Literature review and synthesis of recent research findings.
  • Analysis of new data on regulatory factors, DNA-protein interactions, and post-translational modifications.

Main Results:

  • Identification of additional factors regulating pap expression.
  • Detailed characterization of H-NS and Lrp regulation, including structural insights.
  • Elucidation of the role of acetylation in the regulatory machinery.
  • New understanding of DNA binding by regulators at papI and papBA promoters.

Conclusions:

  • A comprehensive, updated model for the concerted regulation of the pap virulence region is proposed.
  • New insights enhance our understanding of bacterial virulence factor expression and phase variation.