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Nucleosomes: a solution to a crowded intracellular environment?
A Minsky1, R Ghirlando, Z Reich
1Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot, 76100, Israel.
Journal of Theoretical Biology
|October 7, 1997
Summary
Eukaryotic DNA
Area of Science:
- Genomics
- Molecular Biology
- Cell Biology
Background:
- Eukaryotic emergence involved increased DNA and confinement.
- Macromolecular crowding promotes DNA self-assembly and condensation.
- DNA condensation occurs in vitro and in systems lacking nucleosomes.
Purpose of the Study:
- To hypothesize the role of nucleosomes in preventing excessive DNA condensation during eukaryotic evolution.
- To explore how nucleosomes regulate DNA conformational space.
Main Methods:
- In vitro studies of DNA self-assembly.
- Analysis of cellular systems with and without nucleosomes.
Main Results:
- High DNA concentration and confinement favor condensed DNA aggregates.
- Nucleosome-free systems exhibit significant DNA condensation.
- Nucleosomes counteract condensation driven by excluded volume effects.
Conclusions:
- Nucleosomes are essential for negating excessive DNA condensation in eukaryotes.
- Nucleosomes maintain DNA conformational flexibility and enable reversible structural modulations.
- This regulation is crucial for eukaryotic cellular function.