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The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
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A study on Nim expression in Bacteroides fragilis.

David Leitsch1, József Sóki2, Daniel Kolarich3

  • 1Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria.

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Nim proteins in Bacteroides fragilis do not appear to be responsible for metronidazole resistance. This study found no correlation between Nim protein levels and antibiotic resistance in these bacteria.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Antibiotic Resistance

Background:

  • Bacteroides fragilis is an opportunistic pathogen causing severe infections.
  • Metronidazole is a primary antibiotic for treating Bacteroides infections.
  • Metronidazole resistance in Bacteroides is linked to Nim proteins, suspected nitroreductases.

Purpose of the Study:

  • To investigate the expression of nim genes at the protein level in B. fragilis.
  • To determine if Nim protein levels correlate with metronidazole resistance.
  • To elucidate the role of Nim proteins in metronidazole resistance mechanisms.

Main Methods:

  • 2D gel electrophoresis was used to identify and quantify Nim proteins.
  • Nim-positive and nim-negative strains of B. fragilis were analyzed.
  • Protein levels were assessed with and without metronidazole induction.

Main Results:

  • Nim proteins were detected in nim-positive B. fragilis strains.
  • Metronidazole induction did not significantly elevate Nim protein levels.
  • No correlation was observed between Nim protein abundance and metronidazole resistance levels.

Conclusions:

  • The study found no evidence that Nim proteins function as nitroreductases metabolizing metronidazole.
  • Nim proteins do not appear to protect B. fragilis by sequestering activated metronidazole.
  • The mechanism of metronidazole resistance in B. fragilis mediated by Nim proteins remains unclear.