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Updated: Jul 27, 2025

Studying Mitotic Checkpoint by Illustrating Dynamic Kinetochore Protein Behavior and Chromosome Motion in Living Drosophila Syncytial Embryos
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Visualizing dynamic competence pili and DNA capture throughout the long axis of

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Summary

Researchers visualized Bacillus subtilis competence pili, revealing their role in DNA capture during natural transformation. These pili are retractile, associate with DNA, and are distributed along the cell axis.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • Bacterial natural transformation is a key mechanism for horizontal gene transfer.
  • The initial DNA capture step is mediated by competence pili, but their structure in Bacillus subtilis remained unvisualized.
  • Previous studies relied on genetic and functional data to infer pilus involvement.

Approach:

  • Utilized fluorophore-conjugated maleimide labeling for visualization.
  • Employed epifluorescence microscopy to observe functional competence pili in Bacillus subtilis.
  • Analyzed pilus length, retractile properties, DNA association, and cell surface distribution.

Key Points:

  • Functional competence pili in Bacillus subtilis were visualized for the first time.
  • Pili are approximately 300nm in length, retractile, and bind to DNA.
  • Pili are distributed along the cell's long axis, not just at the poles.

Conclusions:

  • The findings support a distributed model for Bacillus subtilis transformation machinery.
  • Initial DNA capture by pili occurs along the cell's long axis.
  • Subsequent DNA processing steps may also occur away from the cell poles.