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Single-cell Microfluidic Analysis of Bacillus subtilis
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High-throughput single-molecule nanofluidic studies on B. subtilis Rok protein interaction with DNA.

Evgeniya Pavlova1, Radhika Nambannor Kunnath1, Bert van Erp2,3,4

  • 1Division of Chemical Biology, Department of Life Sciences, Chalmers University of Technology, Gothenburg, Sweden.

QRB Discovery
|July 8, 2025
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Summary

We developed a high-throughput nanofluidic platform to study DNA-protein interactions. This system revealed how the Rok protein condenses DNA, aids in DNA hybridization, and binds preferentially to AT-rich regions.

Keywords:
BiophysicsDNAfluorescence microscopygenome organsationnanofluidics

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genomics

Background:

  • DNA-protein interactions are crucial for genome organization and gene regulation.
  • Single-molecule techniques provide high-resolution insights into these complex processes.
  • Rok is a multifunctional protein from *Bacillus subtilis* involved in DNA dynamics.

Purpose of the Study:

  • To characterize the DNA-binding and functional activities of the Rok protein.
  • To establish an automated, high-throughput nanofluidic platform for DNA-protein interaction studies.
  • To investigate the role of Rok's structural variants in its DNA-related functions.

Main Methods:

  • Development of an automated, high-throughput nanofluidic imaging platform utilizing nanochannels.
  • Simultaneous analysis of thousands of DNA molecules under various conditions.
  • Comparative study of wild-type Rok with its variants (∆Rok and sRok) using the nanofluidic system.

Main Results:

  • Rok protein exhibits DNA-condensing activity by bridging distant DNA segments.
  • Rok facilitates the hybridization of complementary single-stranded DNA overhangs, suggesting a role in homology search.
  • Rok displays sequence-selective binding, with a preference for adenine and thymine-rich (AT-rich) DNA regions.
  • The linker region of Rok is essential for its single-stranded DNA interaction and hybridization capabilities.

Conclusions:

  • The study elucidates the multifaceted roles of Rok in DNA dynamics, including condensation and hybridization.
  • The findings highlight the significance of Rok's linker domain in mediating interactions with single-stranded DNA.
  • Single-molecule nanofluidics is validated as a powerful high-throughput tool for investigating DNA-protein interactions.