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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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DNA-loop extruding condensin complexes can traverse one another.

Eugene Kim1, Jacob Kerssemakers1, Indra A Shaltiel2

  • 1Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft, The Netherlands.

Nature
|March 6, 2020
PubMed
Summary
This summary is machine-generated.

Two yeast condensin (SMC) protein complexes interact to package DNA. They form novel Z-loop structures, enabling dynamic DNA compaction crucial for chromosome organization.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Condensin, a structural maintenance of chromosome (SMC) complex, acts as a DNA motor.
  • The collective action of condensin in DNA packaging remains poorly understood.

Purpose of the Study:

  • To investigate the interactions between two DNA-loop-extruding yeast condensin complexes.
  • To elucidate the mechanisms of cooperative DNA packaging by condensin.

Main Methods:

  • Time-lapse single-molecule visualization techniques.
  • Observation of mutual interactions between individual yeast condensin motors.

Main Results:

  • Condensin complexes dynamically alter each other's DNA loop sizes, irrespective of distance.
  • Proximity allows condensin complexes to form Z-loops, a structure with three parallel DNA helices.
  • Z-loops facilitate gap-filling and create symmetric dimer motors for DNA pulling.

Conclusions:

  • Condensin utilizes diverse looping structures, including Z-loops, for efficient chromosomal compaction.
  • Interactions between condensin motors are key to collective DNA packaging and chromosome organization.