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Related Concept Videos

Condensins02:15

Condensins

Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
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Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
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Updated: May 13, 2026

Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores
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SMC condensation centers in Bacillus subtilis are dynamic structures.

Luise A K Kleine Borgmann1, Hanna Hummel, Maximilian H Ulbrich

  • 1Microbiology, Faculty of Biology, University of Freiburg, Freiburg, Germany.

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The bacterial SMC complex rapidly binds and unbinds DNA, crucial for chromosome segregation. Impaired ATPase activity disrupts this dynamic, leading to segregation defects and altered localization.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Structural Maintenance of Chromosomes (SMC) complexes are vital for chromosome organization.
  • These complexes form bipolar assemblies essential for compaction and segregation.
  • Understanding SMC dynamics is key to bacterial chromosome management.

Purpose of the Study:

  • To investigate the dynamic binding and turnover rates of bacterial SMC complexes on the chromosome.
  • To determine the role of SMC ATPase activity in its function and localization.
  • To compare SMC dynamics with other nucleoid-associated proteins.

Main Methods:

  • Fluorescence Recovery After Photobleaching (FRAP) was used to measure SMC complex exchange rates.
  • In vitro DNA binding assays were performed for mutated SMC.
  • Localization studies assessed the impact of mutations on SMC distribution.

Main Results:

  • Bacterial SMC complexes exhibit high exchange rates, indicating rapid on/off binding to DNA.
  • De novo protein synthesis significantly influences SMC turnover.
  • A mutation affecting SMC ATPase activity caused severe chromosome segregation defects and widespread mislocalization.

Conclusions:

  • Bacterial SMC complexes possess high, condensin-like turnover rates essential for chromosome segregation.
  • ATP turnover is critical for proper SMC function and localization in Bacillus subtilis.
  • Differential exchange rates of nucleoid-associated proteins may underlie epigenetic phenomena in bacteria.