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Related Experiment Video

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Direct visualization of sequence-specific DNA binding by gonococcal type IV pili.

Alex Hughes-Games1,2,3, Sean A Davis3, Darryl J Hill1

  • 1School of Cellular and Molecular Medicine, University of Bristol, Bristol, UK.

Microbiology (Reading, England)
|August 3, 2022
PubMed
Summary

Neisseria gonorrhoeae uses DNA uptake sequences (DUS) to acquire DNA, aided by type IV pili (T4P). This study confirms T4P bind DNA in a DUS-specific manner, supporting their role in initial DNA capture for transformation.

Keywords:
ComPDNA bindingDNA uptake sequenceNeisseriaType IV pili

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Neisseria gonorrhoeae causes gonorrhea, a significant global health issue.
  • Antimicrobial resistance in N. gonorrhoeae is increasing due to chromosomal resistance determinants acquired via natural transformation.
  • Natural transformation involves DNA uptake mediated by a specialized system recognizing DNA uptake sequences (DUS).

Purpose of the Study:

  • To investigate the role of type IV pili (T4P) in DNA binding during Neisseria gonorrhoeae transformation.
  • To confirm sequence-specific, ComP-dependent DNA binding by elongated T4P fibers.

Main Methods:

  • Quantitative measurement of DNA binding to gonococcal T4P fibers.
  • Direct visualization of DNA-T4P binding complexes using confocal fluorescence microscopy.

Main Results:

  • Elongated T4P fibers demonstrate sequence-specific DNA binding capacity.
  • DNA binding to T4P is dependent on the ComP protein.

Conclusions:

  • The findings support the hypothesis that T4P are involved in the initial capture of DUS-containing DNA during Neisseria gonorrhoeae transformation.
  • This provides evidence for the direct role of T4P in sequence-specific DNA uptake.