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Energy Landscapes and Structural Plasticity of Intrinsically Disordered Histones.

Rafael G Viegas1,2, Hao Wu3, Murilo N Sanches2

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Post-translational modifications like acetylation alter the conformational dynamics of intrinsically disordered proteins (IDPs), specifically histone tails. This structural plasticity influences their biological functions in chromatin regulation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Intrinsically disordered proteins (IDPs) lack stable 3D structures, allowing diverse functions.
  • Histone tails (H4, H1) are key IDPs involved in chromatin regulation.
  • Post-translational modifications (PTMs) significantly impact IDP function.

Purpose of the Study:

  • Investigate conformational dynamics of histone H4 tail and linker histone H1.
  • Determine the effect of acetylation (a PTM) on histone tail structures.
  • Correlate structural changes with biological roles in chromatin.

Main Methods:

  • Utilized the energy landscape visualization method (ELViM).
  • Projected and analyzed the conformational space of wild type and acetylated histone H4 tails.
  • Examined the conformational space of linker histone H1 in relation to nucleosome binding.

Main Results:

  • Acetylation reduces conformational heterogeneity of the H4 tail.
  • Distinct conformational ensembles were identified for acetylated versus wild-type H4 tails.
  • Nucleosome binding modes influence the structural heterogeneity of linker histone H1.

Conclusions:

  • Conformational plasticity and PTMs are crucial for IDP multifunctionality.
  • Findings enhance understanding of IDPs in chromatin dynamics and cellular regulation.
  • Structural insights provide a basis for further functional studies of histones.