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Partially Assembled Nucleosome Structures at Atomic Detail.

Georgy N Rychkov1, Andrey V Ilatovskiy2, Igor B Nazarov3

  • 1Division of Molecular and Radiation Biophysics, B.P. Konstantinov Petersburg Nuclear Physics Institute, National Research Center "Kurchatov Institute", Orlova Roscha, Gatchina, Leningrad District, Russia; Institute of Physics, Nanotechnology and Telecommunications, NRU Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia.

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Summary
This summary is machine-generated.

Partially assembled nucleosome states (PANS) are crucial for regulating DNA accessibility. Structural models reveal stable DNA protection, explaining PANS

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Area of Science:

  • Molecular biology
  • Genomics
  • Structural biology

Background:

  • Canonical nucleosomes are well-studied, but partially assembled nucleosome states (PANS) are increasingly recognized for their importance in genomic DNA accessibility regulation.
  • Understanding the precise structures of PANS is key to deciphering cellular mechanisms controlling DNA access.

Purpose of the Study:

  • To provide atomic-level structural models of three key PANS: hexasome, tetrasome, and disome.
  • To elucidate the role of PANS in regulating genomic DNA accessibility.
  • To offer an alternative interpretation of genome-wide studies on DNA protection in active chromatin.

Main Methods:

  • Molecular dynamics simulations
  • Atomic force microscopy
  • Analysis of existing experimental data (AFM, FRET, SAXS)

Main Results:

  • Detailed structural models of hexasome, tetrasome, and disome were generated.
  • Stable regions of DNA protected by histone cores were identified within PANS.
  • An average of 18 base pairs of DNA are protected per histone protein within these structures.
  • PANS are proposed to exist in substantial amounts in actively transcribing regions.

Conclusions:

  • PANS play a significant role in DNA accessibility regulation.
  • The structural stability of PANS provides a basis for understanding their function.
  • PANS may be prerequisites for rapid in vivo transcription, not just consequences.