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The NtrYX Two-Component System Regulates the Bacterial Cell Envelope.

Kimberly C Lemmer1, François Alberge1, Kevin S Myers1

  • 1Wisconsin Energy Institute, Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Mbio
|May 21, 2020
PubMed
Summary
This summary is machine-generated.

The NtrYX two-component system regulates bacterial cell envelope assembly and function. Loss of NtrYX impacts peptidoglycan, lipopolysaccharide, and outer membrane permeability in Rhodobacter sphaeroides.

Keywords:
Rhodobactercell divisioncell envelopelipopolysaccharidepeptidoglycanperiplasmproteobacteriatwo-component system

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Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Cell Envelope Biology

Background:

  • The NtrYX two-component system is involved in bacterial symbiosis and metabolism.
  • In Rhodobacter sphaeroides, NtrYX deficiency leads to increased lipid production and sensitivity to cell envelope-active agents.

Purpose of the Study:

  • To investigate the direct role of the NtrYX two-component system in regulating the bacterial cell envelope.
  • To identify specific cell envelope genes controlled by NtrYX.

Main Methods:

  • Chromatin immunoprecipitation sequencing (ChIP-seq) to identify NtrX binding sites.
  • Analysis of cell envelope composition (peptidoglycan, lipopolysaccharide).
  • Microscopy to assess cell morphology and periplasmic thickness.

Main Results:

  • NtrX directly binds upstream of genes involved in peptidoglycan biosynthesis, modification, and cell division.
  • Absence of NtrYX alters peptidoglycan precursor and lipopolysaccharide levels.
  • NtrYX deficiency increases cell length, periplasmic thickness, and outer membrane permeability.

Conclusions:

  • NtrYX is a novel regulator of bacterial cell envelope assembly, structure, and function.
  • This system plays a conserved role in maintaining cell envelope integrity and permeability.
  • NtrYX controls the transcription of key cell envelope-related genes in Rhodobacter sphaeroides.