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Related Experiment Videos

Negative chemotaxis in Cytophaga johnsonae

Z X Liu1, I Fridovich

  • 1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.

Canadian Journal of Microbiology
|May 1, 1996
PubMed
Summary

Gliding bacteria like Cytophaga johnsonae exhibit negative chemotaxis, repelled by hydrogen peroxide and other substances. This study demonstrates chemotaxis can be effectively studied in gliding bacteria.

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Area of Science:

  • Microbiology
  • Bacterial Motility
  • Chemotaxis

Background:

  • Chemotaxis is well-researched in flagellated bacteria (e.g., Escherichia coli, Salmonella typhimurium).
  • Chemotaxis in gliding bacteria remains understudied.
  • Cytophaga johnsonae is a rapidly motile gliding bacterium.

Purpose of the Study:

  • To investigate negative chemotaxis in the gliding bacterium Cytophaga johnsonae.
  • To identify substances that elicit repellent responses in C. johnsonae.
  • To establish C. johnsonae as a model for studying chemotaxis in gliding bacteria.

Main Methods:

  • Exposure of C. johnsonae to various chemical attractants and repellents.
  • Observation of bacterial movement and response to chemical gradients.
  • Assessment of the effect of catalase, nalidixic acid, and sodium phosphate on chemotaxis.

Main Results:

  • Cytophaga johnsonae demonstrated negative chemotaxis, being repelled by hydrogen peroxide (H2O2), OCl-, N-chlorotaurine, and low pH.
  • The repellent effect of H2O2 was abolished by catalase.
  • Nalidixic acid did not inhibit negative chemotaxis to H2O2, while sodium phosphate did.

Conclusions:

  • Cytophaga johnsonae exhibits distinct negative chemotaxis responses.
  • Catalase activity is involved in the response to hydrogen peroxide.
  • Gliding bacteria, specifically C. johnsonae, provide a viable system for convenient chemotaxis studies.

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