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Related Experiment Videos

The nucleosomal array: structure/function relationships

T M Fletcher1, J C Hansen

  • 1Cancer Therapy and Research Center, Institute for Drug Development, San Antonio, TX 78245-3217, USA.

Critical Reviews in Eukaryotic Gene Expression
|January 1, 1996
PubMed
Summary
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Nucleosomal arrays, the building blocks of chromosomes, dynamically regulate DNA compaction and gene transcription. Their structural states, influenced by histone tails, are crucial for DNA replication and gene expression.

Area of Science:

  • Molecular Biology
  • Chromatin Biology
  • Genetics

Background:

  • Nucleosomal arrays are fundamental units of chromatin structure, essential for DNA packaging, transcription, and replication.
  • Understanding their dynamic behavior is key to comprehending nuclear processes.

Purpose of the Study:

  • To investigate the structural dynamics of homogeneous length-defined nucleosomal arrays in solution.
  • To elucidate the role of histone tail domains in nucleosomal array folding and function.

Main Methods:

  • Utilized homogeneous length-defined nucleosomal arrays for structural analysis.
  • Studied conformational states (folded, self-associated, dissociated) under physiological salt conditions.

Main Results:

Related Experiment Videos

  • Nucleosomal arrays exist in a dynamic equilibrium between different conformational states.
  • Histone tail domains are critical for array folding and self-association, impacting DNA compaction.
  • Array folding represses transcription but can be modulated by acetylation or histone octamer depletion.

    • Conclusions:

    • Nucleosomal arrays are not inert but are key participants in eukaryotic chromosomal processes.
    • Histone tail domains play a vital role in regulating chromatin structure and function.
    • The dynamic properties of nucleosomal arrays are linked to replication-coupled chromatin assembly and transcriptional regulation.