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Generation of Null Mutants to Elucidate the Role of Bacterial Glycosyltransferases in Bacterial Motility
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Peptidoglycan maturation enzymes affect flagellar functionality in bacteria.

Sophie Roure1, Mathilde Bonis, Catherine Chaput

  • 1Institut Pasteur, Group Biology and Genetics of the Bacterial Cell Wall, Paris, F-75015, France.

Molecular Microbiology
|September 22, 2012
PubMed
Summary
This summary is machine-generated.

Lytic transglycosylases are crucial for bacterial motility and colonization. These enzymes enable proper flagellar motor function by interacting with the peptidoglycan layer for Helicobacter pylori and other pathogens.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Pathogenesis

Background:

  • The bacterial flagellum is a complex organelle enabling motility, essential for many pathogens.
  • Flagellar assembly and function depend on interactions with the peptidoglycan layer.
  • Lytic transglycosylases are enzymes that degrade peptidoglycan, playing roles in cell wall remodeling.

Purpose of the Study:

  • To investigate the role of lytic transglycosylases in the motility and colonization of Helicobacter pylori.
  • To determine the impact of lytic transglycosylase activity on flagellar motor protein localization and function.
  • To explore the broader implications for other bacterial pathogens.

Main Methods:

  • Genetic manipulation of Helicobacter pylori to create lytic transglycosylase-deficient strains.
  • Assessment of bacterial motility and flagellar rotation.
  • Analysis of flagellar motor protein (MotB) localization using microscopy.
  • Comparative studies with Salmonella typhimurium and Listeria monocytogenes.

Main Results:

  • Helicobacter pylori requires an endogenous lytic transglycosylase for full motility and gastric mucosa colonization.
  • Loss of lytic transglycosylase activity leads to a 'paralyzed' phenotype, indicating impaired flagellar rotation.
  • Flagellar motor protein MotB fails to localize correctly to the bacterial pole in the absence of the lytic transglycosylase.
  • Similar requirements for lytic transglycosylases or related enzymes were observed in Salmonella typhimurium and Listeria monocytogenes.

Conclusions:

  • Lytic transglycosylases are essential for Helicobacter pylori motility and colonization.
  • These enzymes are critical for the proper anchoring and function of the flagellar motor, likely through peptidoglycan maturation.
  • The findings highlight a conserved mechanism across different bacterial pathogens for flagellar motor functionality.