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Multivalency-dependent DNA compaction in bridging-induced condensates.

Muhammad Aetizaz1,2, Xuefeng Wei1, Wei Zhuang1

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.

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The optimal number of protein binding sites for efficient DNA organization via bridging-induced phase separation (BIPS) is three. This finding advances understanding of chromosome structure and protein-DNA interactions.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Biology

Background:

  • Cohesin complexes are vital for DNA bridging and phase separation, crucial for chromosome organization.
  • Bridging-induced phase separation (BIPS) is key to DNA compaction, but optimal protein binding site requirements are unclear.

Purpose of the Study:

  • Investigate the relationship between DNA supercoiling and protein-mediated BIPS.
  • Determine the optimal number of protein binding sites for efficient DNA condensate formation.

Main Methods:

  • Coarse-grained molecular dynamics simulations.
  • Utilized a circular DNA model to ensure topological integrity.
  • Compared bi-, tri-, tetra-, and no-patch systems across varying DNA lengths and supercoiling stress.

Main Results:

  • Tri-patch systems demonstrated maximum compaction efficiency and structural integrity.
  • Tetra-patch systems showed comparable compaction but exhibited geometric frustration and increased asphericity.
  • Protein performance was optimal with three binding sites.

Conclusions:

  • Three binding sites represent the optimal valency for efficient protein-DNA assemblies and BIPS.
  • Provides a quantitative framework for designing synthetic chromosome organizers.
  • Informs applications in artificial chromosome packaging and protein condensate therapeutics.